siunitx 1.0 (16jun08)

git-svn-id: svn://tug.org/texlive/trunk@8852 c570f23f-e606-0410-a88d-b1316a301751

30 files changed, 17910 insertions, 0 deletions

diff --git a/Master/texmf-dist/bibtex/bib/siunitx/siunitx.bib b/Master/texmf-dist/bibtex/bib/siunitx/siunitx.bib
new file mode 100644
index 00000000000..322ed1577a8
--- /dev/null
+++ b/Master/texmf-dist/bibtex/bib/siunitx/siunitx.bib
@@ -0,0 +1,38 @@
+@misc{BIPM:EN,
+  note = {\url{http://www.bipm.org/en/si/}},
+}
+
+@misc{BIPM:FR,
+  note = {\url{http://www.bipm.org/fr/si/}},
+}
+
+@misc{BIPM:PDF,
+  note = {\url{http://www.bipm.org/en/si/si_brochure/}},
+}
+
+@misc{Eijkhout,
+  author =       {Victor Eijkhout},
+  note =         {\url{http://www.eijkhout.net/tbt/}},
+  title =        {{\TeX} by {T}opic},
+  year =         {2007},
+}
+
+@misc{fancyunits,
+  author = {Heiko Bauke},
+  note = {\url{http://www.mpi-hd.mpg.de/personalhomes/bauke/LaTeX/Tips_und_Tricks/fancyunits/index.php}},
+  title = {\pkg{fancyunits}},
+  year = 2007,
+}
+
+@misc{IUPAC,
+  note = {\url{http://old.iupac.org/publications/books/gbook/green_book_2ed.pdf}},
+  title = {The \textsc{iupac} {G}reen {B}ook},
+  year = 1993,
+}
+
+@misc{NIST,
+  note = {\url{http://physics.nist.gov/cuu/Units/index.html}},
+}
+\endinput
+%%
+%% End of file `siunitx.bib'.
diff --git a/Master/texmf-dist/doc/latex/siunitx/README b/Master/texmf-dist/doc/latex/siunitx/README
new file mode 100644
index 00000000000..f7a2eb88dc1
--- /dev/null
+++ b/Master/texmf-dist/doc/latex/siunitx/README
@@ -0,0 +1,29 @@
+----------------------------------------------------------------

+The siunitx package --- A comprehensive (SI) units package

+Maintained by Joseph Wright

+E-mail: joseph.wright@morningstar2.co.uk

+Released under the LaTeX Project Public License v1.3c or later

+See http://www.latex-project.org/lppl.txt

+----------------------------------------------------------------

+

+Typesetting values with units requires care to ensure that the

+combined mathematical meaning of the value plus unit combination

+is clear.  In particular, the SI units system lays down a

+consistent set of units with rules on how these are to be used.

+However, different countries and publishers have differing

+conventions on the exact appearance of numbers (and units).

+

+The siunitx provides a set of tools for authors to typeset

+numbers and units in a consistent way.  The package has an

+extended set of configuration options which make it possible to

+follow varying typographic conventions with the same input

+syntax.  The package includes automated processing of numbers

+and units, and the ability to control tabular alignment of

+numbers.

+

+A number of LaTeX packages have been developed in the past for

+formatting units: SIunits, sistyle, unitsdef, unitspkg,

+fancyunits and fancynum.  Support for users of all of these

+packages is available as emulation modules in siunitx.  In

+addition, siunitx can carry out many of the functions of the

+dcolumn, rccol and numprint packages.

diff --git a/Master/texmf-dist/doc/latex/siunitx/si-bug.ltx b/Master/texmf-dist/doc/latex/siunitx/si-bug.ltx
new file mode 100644
index 00000000000..d437dc2a5ce
--- /dev/null
+++ b/Master/texmf-dist/doc/latex/siunitx/si-bug.ltx
@@ -0,0 +1,31 @@
+%%
+%% This is file `si-bug.ltx',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `bug')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\listfiles
+\documentclass{article}
+\usepackage{siunitx}
+\sisetup{debug}
+\begin{document}
+This is the bug test-case document for the \textsf{siunitx}
+package.\\
+Please put your demonstration here, and e-mail to the package
+author.
+\begin{center}
+  \texttt{joseph.wright@morningtar2.co.uk}
+\end{center}
+\end{document}
+\endinput
+%%
+%% End of file `si-bug.ltx'.
diff --git a/Master/texmf-dist/doc/latex/siunitx/siunitx-manual.pdf b/Master/texmf-dist/doc/latex/siunitx/siunitx-manual.pdf
new file mode 100644
index 00000000000..876361b294b
--- /dev/null
+++ b/Master/texmf-dist/doc/latex/siunitx/siunitx-manual.pdf
diff --git a/Master/texmf-dist/doc/latex/siunitx/siunitx.pdf b/Master/texmf-dist/doc/latex/siunitx/siunitx.pdf
new file mode 100644
index 00000000000..8b0b8d59923
--- /dev/null
+++ b/Master/texmf-dist/doc/latex/siunitx/siunitx.pdf
diff --git a/Master/texmf-dist/source/latex/siunitx/siunitx.dtx b/Master/texmf-dist/source/latex/siunitx/siunitx.dtx
new file mode 100644
index 00000000000..04e9eb37b8e
--- /dev/null
+++ b/Master/texmf-dist/source/latex/siunitx/siunitx.dtx
@@ -0,0 +1,12689 @@
+% \iffalse meta-comment
+%
+% Copyright (C) 2008 by
+%    Joseph Wright <joseph.wright@morningstar2.co.uk>
+%
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either
+% version 1.3c of this license or (at your option) any later
+% version. The latest version of this license is in
+%    http://www.latex-project.org/lppl.txt
+% and version 1.3c or later is part of all distributions of
+% LaTeX version 2005/12/01 or later.
+%
+% This work has the LPPL maintenance status `maintained'.
+%
+% The current maintainer of this work is Joseph Wright.
+%
+% This work consists of the source file siunitx.dtx
+%                 and the derived files siunitx.ins,
+%                                       siunitx.sty,
+%                                       jawltxdoc.sty,
+%                                       si-bug.ltx,
+%                                       si-SIunits.cfg,
+%                                       si-sistyle.cfg,
+%                                       si-unitsdef.cfg,
+%                                       si-units.cfg,
+%                                       si-hepunits.cfg,
+%                                       si-fancynum.cfg,
+%                                       si-fancyunits.cfg,
+%                                       si-prefix.cfg,
+%                                       si-named.cfg,
+%                                       si-prefixed.cfg,
+%                                       si-addn.cfg,
+%                                       si-accepted.cfg,
+%                                       si-physical.cfg,
+%                                       si-abbr.cfg,
+%                                       si-synchem.cfg,
+%                                       si-hep.cfg,
+%                                       si-astro.cfg,
+%                                       si-binary.cfg,
+%                                       si-UK.cfg,
+%                                       si-USA.cfg,
+%                                       si-DE.cfg,
+%                                       si-ZA.cfg,
+%                                       siunitx.bib and
+%                                       siunitx.pdf
+%
+% TDS-ready files:
+%    The compressed file siunitx.tds.zip contains an unpacked version
+%    of all of the files included here, and pre-compiled
+%    documentation in PDF format.  Simply decompress siunitx.tds.dtx
+%    in your local TeX directory, run your hash program (texhash,
+%    initexmf --update-fndb, etc.) and everything will be ready to
+%    go.  The user documentation for the package is called
+%    siunitx-manual.pdf; the file siunitx.pdf includes the user
+%    manual and the fully-indexed source code.
+%
+% Unpacking:
+%    (a) If siunitx.ins is present:
+%           tex siunitx.ins
+%    (b) Without siunitx.ins:
+%           tex siunitx.dtx
+%    (c) If you use LaTeX to generate files:
+%           latex \let\install=y\input{siunitx.dtx}
+%
+% Documentation:
+%    (a) Without write18 enabled:
+%          pdflatex siunitx.dtx
+%          bibtex8 --wolfgang siunitx
+%          makeindex -s gind.ist siunitx.idx
+%          makeindex -s gglo.ist -o siunitx.gls siunitx.glo
+%          pdflatex siunitx.dtx
+%          pdflatex siunitx.dtx
+%    (b) With write18 enabled:
+%          pdflatex siunitx.dtx
+%          pdflatex siunitx.dtx
+%          pdflatex siunitx.dtx
+%
+% Installation:
+%     Copy siunitx.sty and the various .cfg files to a location
+%     searched by TeX, and if required by your TeX installation,
+%     run the appropriate command to build a hash of files
+%     (texhash, initexmf --update-fndb, etc.)
+%
+% Note:
+%     The jawltxdoc.sty file is not needed for installation,
+%     only for building the documentation; it may be deleted
+%     after producing the documentation (if necessary).
+%
+%<*ignore>
+% This is all taken verbatim from Heiko Oberdiek's packages
+\begingroup
+  \def\x{LaTeX2e}%
+\expandafter\endgroup
+\ifcase 0\ifx\install y1\fi\expandafter
+         \ifx\csname processbatchFile\endcsname\relax\else1\fi
+         \ifx\fmtname\x\else 1\fi\relax
+\else\csname fi\endcsname
+%</ignore>
+%<*install>
+\input docstrip.tex
+\keepsilent
+\askforoverwritefalse
+\preamble
+ ----------------------------------------------------------------
+ The siunitx package --- A comprehensive (SI) units package
+ Maintained by Joseph Wright
+ E-mail: joseph.wright@morningstar2.co.uk
+ Released under the LaTeX Project Public License v1.3c or later
+ See http://www.latex-project.org/lppl.txt
+ ----------------------------------------------------------------
+
+\endpreamble
+\Msg{Generating siunitx files:}
+\generate{\file{jawltxdoc.sty}{\from{\jobname.dtx}{jawltxdoc}}
+}
+\usedir{tex/latex/siunitx}
+\generate{\file{\jobname.sty}{\from{\jobname.dtx}{package}}
+}
+\usedir{source/latex/siunitx}
+\generate{\file{\jobname.ins}{\from{\jobname.dtx}{install}}
+}
+\usedir{doc/latex/siunitx}
+\generate{\file{si-bug.ltx}{\from{\jobname.dtx}{bug}}
+}
+\usedir{tex/latex/siunitx/config}
+\generate{\file{si-SIunits.cfg}{\from{\jobname.dtx}{SIunits}}
+          \file{si-sistyle.cfg}{\from{\jobname.dtx}{sistyle}}
+          \file{si-unitsdef.cfg}{\from{\jobname.dtx}{unitsdef}}
+          \file{si-units.cfg}{\from{\jobname.dtx}{units}}
+          \file{si-hepunits.cfg}{\from{\jobname.dtx}{hepunits}}
+          \file{si-fancynum.cfg}{\from{\jobname.dtx}{fancynum}}
+          \file{si-fancyunits.cfg}{\from{\jobname.dtx}{fancyunits}}
+}
+\generate{\file{si-prefix.cfg}{\from{\jobname.dtx}{prefix}}
+          \file{si-named.cfg}{\from{\jobname.dtx}{named}}
+          \file{si-prefixed.cfg}{\from{\jobname.dtx}{prefixed}}
+          \file{si-addn.cfg}{\from{\jobname.dtx}{addn}}
+          \file{si-accepted.cfg}{\from{\jobname.dtx}{accepted}}
+          \file{si-physical.cfg}{\from{\jobname.dtx}{physical}}
+          \file{si-abbr.cfg}{\from{\jobname.dtx}{abbr}}
+}
+\generate{\file{si-synchem.cfg}{\from{\jobname.dtx}{synchem}}
+          \file{si-hep.cfg}{\from{\jobname.dtx}{hep}}
+          \file{si-astro.cfg}{\from{\jobname.dtx}{astro}}
+          \file{si-binary.cfg}{\from{\jobname.dtx}{binary}}
+}
+\generate{\file{si-UK.cfg}{\from{\jobname.dtx}{UK}}
+          \file{si-USA.cfg}{\from{\jobname.dtx}{USA}}
+          \file{si-DE.cfg}{\from{\jobname.dtx}{DE}}
+          \file{si-ZA.cfg}{\from{\jobname.dtx}{ZA}}
+}
+\nopreamble
+\usedir{bibtex/bib/siunitx}
+\generate{\file{\jobname.bib}{\from{\jobname.dtx}{refs}}
+}
+\nopreamble\nopostamble
+\usedir{doc/latex/siunitx}
+\generate{\file{README.txt}{\from{\jobname.dtx}{readme}}
+}
+\endbatchfile
+%</install>
+%<*readme>
+----------------------------------------------------------------
+The siunitx package --- A comprehensive (SI) units package
+Maintained by Joseph Wright
+E-mail: joseph.wright@morningstar2.co.uk
+Released under the LaTeX Project Public License v1.3c or later
+See http://www.latex-project.org/lppl.txt
+----------------------------------------------------------------
+
+Typesetting values with units requires care to ensure that the
+combined mathematical meaning of the value plus unit combination
+is clear.  In particular, the SI units system lays down a
+consistent set of units with rules on how these are to be used.
+However, different countries and publishers have differing
+conventions on the exact appearance of numbers (and units).
+
+The siunitx provides a set of tools for authors to typeset
+numbers and units in a consistent way.  The package has an
+extended set of configuration options which make it possible to
+follow varying typographic conventions with the same input
+syntax.  The package includes automated processing of numbers
+and units, and the ability to control tabular alignment of
+numbers.
+
+A number of LaTeX packages have been developed in the past for
+formatting units: SIunits, sistyle, unitsdef, unitspkg,
+fancyunits and fancynum.  Support for users of all of these
+packages is available as emulation modules in siunitx.  In
+addition, siunitx can carry out many of the functions of the
+dcolumn, rccol and numprint packages.
+%</readme>
+%<*ignore>
+\fi
+% Will Robertson's trick
+\immediate\write18{bibtex8 --wolfgang \jobname}
+\immediate\write18{makeindex -s gind.ist -o \jobname.ind  \jobname.idx}
+\immediate\write18{makeindex -s gglo.ist -o \jobname.gls  \jobname.glo}
+%</ignore>
+%<*driver>
+\PassOptionsToClass{a4paper}{article}
+\documentclass[german,english,UKenglish]{ltxdoc}
+\EnableCrossrefs
+\CodelineIndex
+\RecordChanges
+%\OnlyDescription
+% Various adjustments are needed to the packages loaded.  xfrac is
+% only loaded if it is available.  MiKTeX users should note that they
+% will need to download the expl3 and xbase bundles from CTAN to use
+% xfrac; the MiKTeX versions are very old and will cause errors.
+\usepackage[final]{graphicx}
+\IfFileExists{xfrac.sty}
+  {\usepackage{xfrac}}
+  {}
+\usepackage{jawltxdoc}
+\usepackage{textcomp,tikz,pgfplots,tocloft}
+\usepackage[latin1]{inputenc}
+\sisetup{
+  eVcorra=0.1ex,
+  unitsep=cdot,
+  alsoload={synchem,hep,binary,astro},
+  loctolang={UK:UKenglish,DE:german}}
+\setlength{\cftsubsecnumwidth}{2.5em}
+\begin{document}
+  \DocInput{\jobname.dtx}
+\end{document}
+%</driver>
+% \fi
+%
+%\CheckSum{9403}
+%
+% \CharacterTable
+%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
+%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
+%   Digits        \0\1\2\3\4\5\6\7\8\9
+%   Exclamation   \!     Double quote  \"     Hash (number) \#
+%   Dollar        \$     Percent       \%     Ampersand     \&
+%   Acute accent  \'     Left paren    \(     Right paren   \)
+%   Asterisk      \*     Plus          \+     Comma         \,
+%   Minus         \-     Point         \.     Solidus       \/
+%   Colon         \:     Semicolon     \;     Less than     \<
+%   Equals        \=     Greater than  \>     Question mark \?
+%   Commercial at \@     Left bracket  \[     Backslash     \\
+%   Right bracket \]     Circumflex    \^     Underscore    \_
+%   Grave accent  \`     Left brace    \{     Vertical bar  \|
+%   Right brace   \}     Tilde         \~}
+%
+%\GetFileInfo{\jobname.sty}
+%
+%\DoNotIndex{\@car,\@eha,\@ehc,\@empty,\@firstofone,\@firstoftwo}
+%\DoNotIndex{\@for,\@gobble,\@gobbletwo,\@ifl@aded,\@ifnextchar}
+%\DoNotIndex{\@ifpackagelater,\@ifpackageloaded,\@ifstar}
+%\DoNotIndex{\@ifundefined,\@makeother,\@namedef,\@nameuse,\@ne}
+%\DoNotIndex{\@nil,\@secondoftwo,\@temptokena,\@undefined,\AA}
+%\DoNotIndex{\active,\addto,\addtolength,\advance,\afterassignment}
+%\DoNotIndex{\aftergroup,\AtBeginDocument,\AtEndOfPackage}
+%\DoNotIndex{\begingroup,\bfseries,\bgroup,\boldmath,\box}
+%\DoNotIndex{\capitalring,\catcode,\cdot,\chardef,\check@mathfonts}
+%\DoNotIndex{\circ,\csname,\DeclareFontEncoding,\DeclareFontFamily}
+%\DoNotIndex{\DeclareFontShape,\DeclareFontSubstitution}
+%\DoNotIndex{\DeclareMathSymbol,\DeclareRobustCommand}
+%\DoNotIndex{\DeclareSymbolFont,\DeclareTextSymbol}
+%\DoNotIndex{\DeclareTextSymbolDefault,\def,\define@boolkey}
+%\DoNotIndex{\define@choicekey,\define@cmdkey,\define@cmdkeys}
+%\DoNotIndex{\define@key,\displaystyle,\displaywidth,\divide,\do}
+%\DoNotIndex{\edef,\egroup,\else,\encodingdefault,\end,\endcsname}
+%\DoNotIndex{\endgroup,\endinput,\endtabular,\ensuremath}
+%\DoNotIndex{\expandafter,\f@family,\f@series,\fam,\fi,\font}
+%\DoNotIndex{\fontsize,\frac,\gdef,\global,\hbox,\hfil,\hfill,\hskip}
+%\DoNotIndex{\hspace,\hss,\ifcsname,\ifdim,\iffalse,\IfFileExists}
+%\DoNotIndex{\ifmmode,\ifnum,\ifx,\ignorespaces,\inputencodingname}
+%\DoNotIndex{\InputIfFileExists,\key@ifundefine,\let,\long,\m@ne}
+%\DoNotIndex{\makeatletter,\math@version,\mathchoice,\mathnormal}
+%\DoNotIndex{\mathord,\mathrm,\mathsf,\mathtt,\mdseries}
+%\DoNotIndex{\MessageBreak,\mkern,\mp,\NC@find,\NeedsTeXFormat}
+%\DoNotIndex{\newbox,\newcolumntype,\newcommand,\newcount,\newdimen}
+%\DoNotIndex{\newif,\newlength,\newtoks,\nobreak,\noexpand,\p@}
+%\DoNotIndex{\PackageError,\PackageInfo,\PackageWarning,\phantom}
+%\DoNotIndex{\ProcessOptionsX,\protect,\protected@edef,\ProvidesFile}
+%\DoNotIndex{\ProvidesPackage,\Q,\raisebox,\relax,\renewcommand}
+%\DoNotIndex{\RequirePackage,\rlap,\sbox,\scantokens}
+%\DoNotIndex{\scriptscriptstyle,\scriptstyle,\selectfont,\setbox}
+%\DoNotIndex{\setkeys,\setlength,\settoheight,\sf@size,\sfdefault}
+%\DoNotIndex{\sfrac,\skewchar,\sp,\space,\string,\strip@pt}
+%\DoNotIndex{\tabularnewline,\text,\textdegree,\textmu,\textohm}
+%\DoNotIndex{\textsc,\textstyle,\textsuperscript,\the,\thr@@,\times}
+%\DoNotIndex{\ttdefault,\uccode,\unboldmath,\unhbox,\upmu,\Upomega}
+%\DoNotIndex{\uppercase,\upshape,\wd,\xdef,\xspace,\z@}
+%
+%\DoNotIndex{\if,\lowercase,\+,\,,\-,\.,\:,\;,\@argdef,\@cdr}
+%\DoNotIndex{\@ifdefinable,\@testopt,\@yargdef,\color,\endlinechar}
+%\DoNotIndex{\key@ifundefined,\newrobustcmd,\protected,\scriptspace}
+%\DoNotIndex{\usebox,\tw@,\ifinner,\usepackage,\texttt,\textsf}
+%\DoNotIndex{\NC@do,\loop,\l@ngrel@x,\g@addto@macro,\documentclass}
+%\DoNotIndex{\document\,\begin,\=,\@ehb,\\,\listfiles}
+%
+%\DoNotIndex{\pascalsecond,\amperemetresecond,\ohmmetre}
+%\DoNotIndex{\newtonmetre,\newtonmetrenp}
+%\DoNotIndex{\kilogramsquaremetre,\kilogramsquaremetrenp}
+%
+%\changes{v1.0}{2008/06/12}{First official release}
+%
+%\setkeys{lst}{language=[LaTeX]{TeX},moretexcs={sisetup,num,ang,SI,
+%  si,newunit,newpower,newprefix,metre,candela,kelvin,ampere,eV,
+%  second,mole,per,kilogram,Square,squared,cubed,cubic,kilo,centi,
+%  gram,tothe,toprule,midrule,bottomrule,newton,micro,joule,mega,
+%  raiseto,deci,mathnormal,numprint,electronvolt,selectlanguage,
+%  kibi,byte,molar,Molar,mmHg,mebi,torr,parsec,lightyear,clight,
+%  eVperc,addplot,color,milli,cm,Hz,kg,DeclareRobustCommand,
+%  pascal,dalton}}
+%
+%\title{\currpkg\ --- A comprehensive (SI) units package^^A
+%  \thanks{This file describes version \fileversion, last revised
+%    \filedate.}}
+%\author{Joseph Wright^^A
+%  \thanks{E-mail: joseph.wright@morningstar2.co.uk}}
+%\date{Released \filedate}
+%
+%\maketitle
+%
+%\newcommand*{\SIunits}{\pkg{SIunits}\xspace}
+%\newcommand*{\SIstyle}{\pkg{SIstyle}\xspace}
+%\newcommand*{\unitsdef}{\pkg{unitsdef}\xspace}
+%\newcommand*{\units}{\pkg{units}\xspace}
+%\newcommand*{\numprint}{\pkg{numprint}\xspace}
+%\begin{abstract}
+% Typesetting values with units requires care to ensure that the
+% combined mathematical meaning of the value plus unit combination is
+% clear.  In particular, the SI units system lays down a consistent
+% set of units with rules on how these are to be used.  However,
+% different countries and publishers have differing conventions on
+% the exact appearance of numbers (and units).
+%
+% The \currpkg provides a set of tools for authors to typeset numbers
+% and units in a consistent way.  The package has an extended set of
+% configuration options which make it possible to follow varying
+% typographic conventions with the same input syntax.  The package
+% includes automated processing of numbers and units, and the ability
+% to control tabular alignment of numbers.
+%
+% A number of \LaTeX\ packages have been developed in the past for
+% formatting units: \SIunits, \SIstyle, \unitsdef, \units,
+% \pkg{fancyunits} and \pkg{fancynum}. Support for users of all of
+% these packages is available as emulation modules in \currpkg.
+% In addition, \currpkg can carry out many of the functions of the
+% \pkg{dcolumn}, \pkg{rccol} and \numprint packages.
+%\end{abstract}
+%
+%\begin{multicols}{2}
+%  \tableofcontents
+%\end{multicols}
+%
+%\clearpage
+%\part{Introduction}
+% The correct application of units of measurement is very important
+% in technical applications.  For this reason, carefully-crafted
+% definitions of a coherent units system have been laid down by the
+% \latin{Conf\'erence G\'en\'erale des Poids et
+% Mesures}\footnote{General Conference on Weights and Measures.}
+% (CGPM): this has resulted in the \latin{Syst\`eme International
+% d'Unit\'es}\footnote{International System of Units.} (SI).  At the
+% same time, typographic conventions for correctly displaying both
+% numbers and units exist to ensure that no loss of meaning occurs in
+% printed matter.
+%
+% \currpkg aims to provide a unified method for \LaTeX\ users to
+% typeset units and values correctly and easily.  The design
+% philosophy of \currpkg is to follow the agreed rules by default,
+% but to allow variation through option settings.  In this way,
+% users can use \currpkg to follow the requirements of publishers,
+% co-authors, universities, \etc without needing to alter the input
+% at all.
+%
+% \currpkg is intended as a complete replacement for \SIunits,
+% \SIstyle, \unitsdef, \units, \pkg{fancyunits} and
+% \pkg{fancynum}. As such, emulation modes are provided for all of
+% these packages.  Where possible, conventions from the existing
+% solutions have been used here.  For example, the macros \cs{num},
+% \cs{ang} and \cs{SI} act in a very similar fashion to those in
+% existing packages.
+%
+%\clearpage
+%\part{Using the \currpkg package}
+%
+%\section{For the impatient}
+% \currpkg provides the user macros:
+%\begin{itemize}
+%  \item \cs{SI}\oarg{options}\marg{value}\oarg{pre-unit}\marg{unit}
+%  \item \cs{si}\oarg{options}\marg{unit}
+%  \item \cs{num}\oarg{options}\marg{number}
+%  \item \cs{ang}\oarg{options}\marg{angle}
+%  \item \cs{sisetup}\marg{options}
+%\end{itemize}
+% plus the |S| and |S| column types for decimal alignments and units
+% in tables.  These macros are designed for typesetting units and
+% values with control of appearance and with intelligent processing.
+%
+% By default, all text is typeset in the current upright, serif maths
+% font.  This can be changes by setting the appropriate package
+% options: \opt{obeyall} will use the current font for typesetting.
+%
+% The package includes a ``unit processor'', which allows the use of
+% named units or literal values.  Named units are processed to
+% correctly include powers.
+%\begin{LaTeXexample}
+%  \SI{10}{\gram}\\
+%  \SI{23.4}{g.cm^3}\\
+%  \num{1e34}\\
+%  \ang{1;2;3}\\
+%  \emph{\SI{16,7}{\metre\per\second}}\\
+%  \textbf{\SI{30e3}{\Hz}}\\
+%  \SI{1.2 x 3.56 x 9.2}{\milli\metre}\\
+%  \sisetup{obeyall}
+%  \textbf{\SI{-4.5}{\cm}}\\
+%  \si{\joule\per\mole\per\kelvin}\\
+%  \si[per=frac]{\joule\per\mole\per\kelvin}\\
+%  \num[dp=4]{1.23456}\\
+%  \num[dp=4]{9.8}\\
+%  \begin{tabular}{S[tabformat=3.2]}
+%    \toprule
+%    {Heading}\\
+%    \midrule
+%    1.3 \\
+%    134.2 \\
+%    3.56 \\
+%    74,7 \\
+%    \bottomrule
+%  \end{tabular}
+%\end{LaTeXexample}
+%
+%\section{Requirements}
+% \currpkg requires a reasonably up to date \TeX\ system.  The
+% package requires \eTeX-extensions, which should be available on
+% most systems.\footnote{If you have an old \LaTeX\, try
+% ``\texttt{elatex}'' rather than ``\texttt{latex}''.}  The following
+% packages are also needed:
+%\begin{itemize}
+%  \item \pkg{array} and \pkg{xspace}: from the \pkg{tools} bundle,
+%    which should be available to everyone;
+%  \item \pkg{xkeyval}: this processes the option handling, and needs
+%    to be at least v2.5;
+%  \item \pkg{amstext}: from the \AMS\TeX\ support bundle (the
+%    \AMS\ fonts are also needed to provide the default upright
+%    \si{\micro}).
+%\end{itemize}
+% Hopefully most people using the package will have access to all of
+% those items.
+%
+% To use the \opt{fraction=sfrac} option, the \pkg{xfrac} package is
+% needed.  This needs various experimental \LaTeX3 packages.  As a
+% result, \currpkg does not load \pkg{xfrac}.  If you want to use
+% \opt{fraction=sfrac}, \emph{you} need to load \pkg{xfrac} in your
+% preamble before \currpkg.\footnote{This document has been compiled
+% in this way.  You have to load \pkg{xfrac} first as otherwise very
+% nasty things happen with \pkg{xkeyval}.  MiK\TeX\ users should note
+% that the packaged versions of \pkg{expl3}, \pkg{template} and
+% \pkg{xparse} will not work with \pkg{xfrac}: download copies from
+% \textsc{ctan}!} If the package is not loaded, \opt{fraction=sfrac}
+% falls back on a \pkg{nicefrac}-like method.  The interested user
+% should look at the \pkg{xfrac} documentation for reasons this might
+% not be ideal.\footnote{On the other hand, some fractional units
+% will look really bad with \cs{sfrac}.  Use this option with
+% caution.}
+%
+%\section{Loading the package}
+% \currpkg is loaded by the usual \LaTeX\ method.
+%\begin{LaTeXexample}[noexample]
+%  \usepackage[<options>]{siunitx}
+%\end{LaTeXexample}
+% As is shown in the example, the package can be loaded with one or
+% more options, using the key--value system.  The full range of
+% package options are described in Section~\ref{sec:options}; some
+% options are described in the along with the appropriate user
+% macros.  Most of the user macros accept the same key--value
+% settings as an optional argument.
+%
+%\section{Numbers}
+%\DescribeMacro{\num}
+% Numbers are automatically formatted by the \cs{num} macro.  This
+% takes one optional and one mandatory argument:
+% \cs{num}\oarg{options}\marg{number}.  The contents of \meta{number}
+% are automatically formatted, in a similar method to that used by
+% \numprint.  The formatter removes ``hard'' spaces (\cs{,} and |~|),
+% automatically identifies exponents (by default marked using |e| or
+% |d|) and adds the appropriate spacing of large numbers.  A leading
+% zero is added before a decimal marker, if needed: both ``|.|'' and
+% ``|,|'' are recognised as decimal marker.
+%\begin{LaTeXexample}
+%  \num{1}    \num{123}     \num{1234}  \num{12345}\\
+%  \num{0.1}  \num{0.123}   \num{0,1234} \num{.12345}\\
+%  \num{1e10} \num{3.45d-4} \num{-e10}
+%\end{LaTeXexample}
+% Various error-checking systems are built into the package, so that
+% if \meta{number} does not contain any numeric characters, a warning
+% is issued.  Isolated signs are also detected.  The package
+% recognises |(| and |)| as ``extra'' characters, which can be used
+% to indicate the error in a number.\footnote{This is common in
+% chemical crystallography, for example.}  The \opt{seperr} causes
+% this data to be given as a separate error value.  If the number
+% also contains an exponent, then brackets are re-added after the
+% separation to ensure that meaning is not lost.
+%\begin{LaTeXexample}
+%  $\num{1.234(5)} = \num[seperr]{1.234(5)}$\\
+%  $\num{1.234(5)e6} = \num[seperr]{1.234(5)e6}$
+%\end{LaTeXexample}
+% The same applies to the unit and value macro \cs{SI}, described
+% later, for example the rest mass of an electron \cite{IUPAC}:
+%\begin{LaTeXexample}
+%   $ m_{\mathrm{e}}
+%     = \SI{9.1093897(54)e-31}{\kg} $\\
+%   $ m_{\mathrm{e}}
+%     = \SI[seperr]{9.1093897(54)e-31}{\kg} $
+%\end{LaTeXexample}
+%
+% A number of effects are available as options.  These are fully
+% explained in Section~\ref{sec:options}.  Some of the more useful
+% options are illustrated here.  By default, the output of the
+% package is typeset in maths mode.  However, the use of the current
+% text font can be forced.\footnote{This document is typeset using
+% lowercase numbers in text mode, which emphasises the effect here.}
+%\begin{LaTeXexample}
+%  \num{1234567890} \num[mode=text]{1234567890}
+%\end{LaTeXexample}
+% \currpkg can automatically add zeros and signs to numbers.  This
+% can be altered as desired.
+%\begin{LaTeXexample}
+%  \num{1.}  \num[padnumber=all]{1.}\\
+%  \num{2}   \num[addsign=all]{2}\\
+%  \num{3e4} \num[addsign=mant]{3e4} \num[addsign=all]{3e4}\\
+%  \num{.5}  \num[padnumber=none]{.5}
+%\end{LaTeXexample}
+% The separation of digits can be turned on and off, and the output
+% changed.
+%\begin{LaTeXexample}
+%  \num{1234}  \num[sepfour=true]{1234}\\
+%  \num{12345} \num[digitsep=comma]{12345}\\
+%  \num[digitsep=none]{12345}
+%\end{LaTeXexample}
+% The formatting of exponents is also customisable.
+%\begin{LaTeXexample}
+%  \num{1e10} \num[expproduct=cdot]{1e10}\\
+%  \num{2e20} \num[expbase=5]{2e20}\\
+%  \num{3e30} \num[expproduct=tighttimes]{3e30}
+%\end{LaTeXexample}
+%
+% \currpkg can automatically add colour to negative numbers, which is
+% often useful for highlighting purposes.  This is turned on with the
+% \opt{colourneg} option; the colour used is set by \opt{negcolour}.
+% Both of these are available with the US spellings: \opt{colorneg}
+% and \opt{negcolor}.
+%\begin{LaTeXexample}
+%  \num{-1}\\
+%  \sisetup{colourneg} \num{-2}\\
+%  \num{3e-3}\\
+%  \num[negcolour=blue]{-4}
+%\end{LaTeXexample}
+%
+% \currpkg can automatically zero-fill and round to a fixed number of
+% decimal places.  This is controlled by two options \opt{fixdp} and
+% \opt{dp}.  The later is an integer which specifies how many places
+% to fix to; setting this option automatically sets \opt{fixdp} to
+% \opt{true}.  The place-fixing system will only alter pure numbers: for
+% example, any error component will result in the input being left
+% unchanged.
+%\begin{LaTeXexample}
+%  \num{1.23456}\\
+%  \sisetup{dp=2}
+%  \num{1.23456}\\
+%  \num{9.8}\\
+%  \num{-10.432}\\
+%  \num{44.3221(2)}
+%\end{LaTeXexample}
+%
+%\section{Tabular material}
+%\subsection{Aligning numbers}
+% Centring numbers in tabular content is handled by a new column
+% type, the |S| column.  This is based closely on the \pkg{dcolumn}
+% method for centring numbers in columns, but adds the functionality
+% of the \cs{num} macro.\footnote{The approach used is actually a
+% combination of \pkg{dcolumn} for centring the material and
+% \numprint for processing it.  It will therefore give rather
+% different results than the \texttt{n} and \texttt{N} column types
+% in \numprint.}
+%
+% By default, the decimal marker of the number is placed at the
+% centre of the column, which then resizes to accommodate the width
+% of the contents (\ref{tab:default}).  This behaviour is set by the
+% \opt{tabnumalign=centredecimal} option.  By setting the
+% \opt{tabnumalign} option to \opt{centre}, the centre of the space
+% reserved for the number is placed at the centre of the column.  The
+% space reserved is stored in \opt{tabformat}, which is of the form
+% \texttt{\meta{before}\meta{dec}\meta{after}}, where \meta{before}
+% is the number of characters before the decimal marker and
+% \meta{after} is the number after. Thus in the example,
+% \opt{tabformat=2.4} provides space for two digits before the
+% decimal marker and four after.  \opt{tabnumalign} can also be set
+% to \opt{left} and \opt{right}, with the expected results.
+%\begin{LaTeXexample}[float]
+%  \begin{table}
+%    \caption{Behaviour of \texttt{S} column type
+%      \label{tab:default}}
+%    \centering
+%    \begin{tabular}{%
+%      S%
+%      S[tabnumalign=centre,tabformat=2.4]%
+%      S[tabnumalign=right,tabformat=2.4]%
+%      S[tabnumalign=centre,tabformat=2.4,decimalsymbol=comma]}
+%    \toprule
+%    {Some Values} & {Some Values} & {Some Values} & {Some Values} \\
+%    \midrule
+%     2.3456  &  2.3456  &  2.3456 &  2.3456 \\
+%    34.2345  & 34.2345  & 34.2345 & 34.2345 \\
+%    56.7835  & 56.7835  & 56.7835 & 56.7835 \\
+%    90.473   & 90.473   & 90.473  & 90.473  \\
+%    \bottomrule
+%    \end{tabular}
+%  \end{table}
+%\end{LaTeXexample}
+% The \opt{tabformat} setting can also be used to reserve space for
+% numbers containing exponents.  This is given in the same format as
+% above, but with a mantissa and exponent part (\ref{tab:exptab}).
+% Notice that this is designed to expect that numbers will contain a
+% mantissa.  Exponents can either be aligned so that the ``$\times$''
+% symbols match up vertically, or the exponent part can be allowed to
+% move across as needed. Space for signs is added by using any sign
+% in the \opt{tabformat}, so for example \opt{tabformat=+2.2} and
+% \opt{tabformat=-2.2} have exactly the same effect. Setting
+% \opt{tabformat} will automatically switch from \opt{tabnumalign}
+% from \opt{centredecimal} to \opt{centre}, if the former is
+% currently set. In other cases, the current alignment option is
+% retained.
+%\begin{LaTeXexample}[float]
+%  \begin{table}
+%    \caption{Exponents in tables
+%      \label{tab:exptab}}
+%    \centering
+%    \begin{tabular}{%
+%      S[tabnumalign=right,tabformat=2.2e2]%
+%      S[tabnumalign=centre,tabformat=2.2e1.1]%
+%      S[tabnumalign=centre,tabformat=2.2e1.1,tabalignexp=false]%
+%      S[tabnumalign=centre,tabformat=+2.2]}
+%    \toprule
+%        {Longer values}
+%      & {Longer values}
+%      & {Longer values}
+%      & {Values} \\
+%    \midrule
+%    2.3e1    &  2.34e1  &  2.34e1  & +2.31 \\
+%    34.23e45 & 34.23e45 & 34.23e45 & 34.23 \\
+%    56.78    & 56.78    & 56.78    & -56.78 \\
+%    1.0e34   & 1.0e34   & 1.0e34   & +-1.0 \\
+%    \bottomrule
+%    \end{tabular}
+%  \end{table}
+%\end{LaTeXexample}
+%
+% Data not to be processed as a number should be protected by
+% wrapping it in braces: this is most likely to be true for column
+% headers (again as illustrated).  By default, the contents of
+% non-numeric cells are centred.  This can be altered by setting
+% \opt{tabtextalign}, which can be set to \opt{left}, \opt{right} or
+% \opt{centre}.  The use of digit separators in table columns is
+% accounted for: extra space is reserved if digit separators will be
+% added.
+%
+%\subsection{Columns of units}
+% As a complement to the |S| column, \currpkg also provides a second
+% column type, |s|.  This is intended for producing columns of units.
+%  The letters chosen are intended to be similar to \cs{SI} and
+% \cs{si}, respectively.  The alignment of material in |s| columns
+% is governed by the \opt{tabunitalign} option.
+%\begin{LaTeXexample}[float]
+%  \begin{table}
+%  \centering
+%  \caption{Number and units in tables}
+%  \label{tab:num-unit}
+%    \begin{tabular}{%
+%      S[tabformat=1.2e-1,tabnumalign=centre]%
+%      s[tabunitalign=left]}
+%    \toprule
+%      {Value} &  \multicolumn{1}{c}{Unit} \\
+%    \midrule
+%      2.16e-5 & \metre\squared\per\second \\
+%      2.83e-6 & \metre\squared\per\second \\
+%      7.39e3  & \pascal\cubic\metre\per\mole \\
+%      1.0e5   & \pascal \\
+%    \bottomrule
+%    \end{tabular}
+%  \end{table}
+%\end{LaTeXexample}
+%
+%\section{Angles}
+%\DescribeMacro{\ang}
+% Angles can be typeset using the \cs{ang} command.  This takes two
+% arguments, \cs{ang}\oarg{options}\marg{angle}, where \meta{options}
+% can be any of the package options to apply only to this value.
+% \meta{angle} can be given either as a decimal number or as a
+% semi-colon separated list of degrees, minutes and seconds, \ie\
+% \cs{ang}\marg{decimal angle} or
+% \cs{ang}|{|\meta{degrees}|;|\meta{minutes}|;|\meta{seconds}|}|. By
+% default, no space is introduced between angles and the degrees,
+% minutes and seconds markers.
+%\begin{LaTeXexample}
+%  \ang{10} \ang{12.3} \ang{4,5}\\
+%  \ang{1;2;3} \ang{;;1}\\
+%  \ang{+10;;} \ang{-0;1;}
+%\end{LaTeXexample}
+%
+% By default, angles with no degrees (or minutes) are zero-filled;
+% angles with degrees but no minutes or seconds are not filled.  This
+% behaviour can be altered using the package options.
+%\begin{LaTeXexample}
+%  \ang{;;1} \ang[padangle=none]{;;1}\\
+%  \ang{2;;} \ang[padangle=all]{2;;}\\
+%  \sisetup{padangle=all} \ang{;3;} \ang{4;;} \ang{;;5}
+%\end{LaTeXexample}
+% The \cs{num} macro is used to typeset each number of the angle, so
+% the options for \cs{num} also apply here.  The \opt{anglesep} value
+% can be used to separate degrees, minutes and seconds.
+%\begin{LaTeXexample}
+%  \ang{1.05}    \ang[decimalsymbol=comma]{1.05}\\
+%  \ang{3.67890} \ang[digitsep=comma]{3.67890}\\
+%  \ang{9;8;7}   \ang[anglesep=thin]{9;8;7}
+%\end{LaTeXexample}
+% The degrees, minutes and seconds signs can be placed over the
+% decimal sign using the \opt{astroang} option.  This is designed on
+% the assumption that only the last number given has a decimal
+% part.
+%\begin{LaTeXexample}
+%  \ang{1.2} \ang[astroang]{1.2}\\
+%  \ang{1;2.3;} \ang[astroang]{1;2.3;}\\
+%  \ang{1;2;3.4} \ang[astroang]{1;2;3.4}
+%\end{LaTeXexample}
+%
+%\section{Units and values}
+%\DescribeMacro{\SI}
+% The core aim of \currpkg is correctly typesetting values which have
+% units. The main output macro here is \cs{SI}, which has the same
+% syntax as the macros with the same name in \SIstyle and \unitsdef
+% packages. The \cs{SI} macro takes two mandatory arguments, in
+% addition to the optional set up argument, and a second optional
+% argument:
+% \cs{SI}\oarg{options}\marg{number}\oarg{preunit}\marg{unit}.  The
+% \meta{number} argument operates in exactly the same manner as the
+% equivalent argument of the \cs{num} macro.  \meta{unit} will be
+% typeset with a non-breakable space between it and the preceding
+% number, with font control as outlined earlier.  Finally,
+% \meta{preunit} is a unit to be typeset \emph{before} the numerical
+% value (most likely to be a currency).  Some examples illustrate the
+% general power of the macro.
+%\begin{LaTeXexample}
+%  \SI[mode=text]{1.23}{J.mol^{-1}.K^{-1}}\\
+%  \SI{.23e7}{\candela}\\
+%  \SI[per=slash]{1.99}[\pounds]{\per\kilogram}\\
+%  \SI{70}{\metre\per\second}\\
+%  \SI[per=frac,fraction=nice]{1,345}{\ampere\per\mole}
+%\end{LaTeXexample}
+% The use of unit macros outside of the \cs{SI} macro is described
+% later.
+%
+%\subsection{Literal units}
+% Units can be input in two ways, inspired by \SIstyle and \SIunits.
+% The \SIstyle-like method uses literal input.  Four characters have
+% a special meaning:
+%\begin{itemize}
+%  \item ``|^|'' The superscript character is used without the usual
+%    need for surrounding maths characters (|$|);^^A$
+%  \item ``|.|'' and ``|,|'': the full stop (point) symbol and comma
+%    are made active, and produce the current contents of the
+%    \opt{unitsep} option;
+%  \item ``|~|'' The contents of the \opt{unitspace} option are typeset
+%    by a tilde.
+%\end{itemize}
+% This allows ready input of units.
+%\begin{LaTeXexample}
+%  \SI{10}{kg.m.s^{-2}}\\
+%  \SI{1.453}{g/cm^3}\\
+%  \SI{33.562}{cd~s}\\
+%  \SI[unitsep=medium]{100}{m.s^{-2}}
+%\end{LaTeXexample}
+% The literal unit system will correctly typeset input containing the
+% symbols \si{\micro} (micro), \si{\degree} (degree) and
+% \si{\angstrom} (ring-A).\footnote{Currently this works with \XeTeX\
+% and \pkg{inputenc} using the \texttt{latin1}, \texttt{latin5} and
+% \texttt{latin9} encodings.}
+% \begingroup\makeatletter\si@unt@nonlatin
+%\begin{LaTeXexample}
+%  \SI{10}{µm}\\
+%  \SI{20}{°C}\\
+%  \SI{30}{Å}
+%\end{LaTeXexample}
+%\endgroup
+%
+%\subsection{The unit interpreter}
+% The second operation mode for the \cs{SI} macro is based on the
+% behaviour of \SIunits.  Here, each unit, SI multiple prefix and
+% power is given a macro name.  These are entered in a method very
+% similar to the reading of the unit name in English.
+%\begin{LaTeXexample}
+%  \SI{10}{\kilo\gram\metre\per\second\squared}\\
+%  \SI{1.453}{\gram\per\cubic\centi\metre}\\
+%  \SI{33.562}{\candela\second}\\
+%  \SI[unitsep=thin]{100}{\metre\per\Square\second}\\
+%  \SI[prefixsymbolic=false]{4.56}{\kilo\metre\per\second}
+%\end{LaTeXexample}
+% On its own, this is very similar to \SIunits, and is less
+% convenient than the direct input method.\footnote{Users of \SIunits
+% should note the lack of need for a \cs{usk}-type macro.}  However,
+% the package allows you to define new unit macros; a large number of
+% pre-defined abbreviations are also supplied.  More importantly, by
+% defining macros for units, instead of literal values, new
+% functionality is made available.  Units may be re-defined to give
+% different output, and handling of reciprocal values can be altered.
+%\begin{LaTeXexample}
+%  \SI[per=frac,fraction=frac]{10}{\gram\metre\per\second\squared}\\
+%  \SI[per=slash]{1.453}{\gram\per\cubic\centi\metre}\\
+%  \SI{33.562}{\candela\second}\\
+%  \SI[per=frac,fraction=nice]{100}{\metre\per\Square\second}
+%\end{LaTeXexample}
+% The unit processor will trap \emph{some} errors in the input and
+% give the ``best guess'' result.  However, it is down to the user to
+% check the output.
+%
+%\subsection{Powers of units}
+%\DescribeMacro{\Square}
+%\DescribeMacro{\ssquare}
+%\DescribeMacro{\squared}
+%\DescribeMacro{\cubic}
+%\DescribeMacro{\cubed}
+% Including powers in units is handled using a ``natural language''
+% method.  Thus preceding a unit by \cs{Square} or \cs{cubic} which
+% raise the unit to the appropriate power, while \cs{squared} or
+% \cs{cubed} follow the unit they apply to. The \cs{Square} macro is
+% capitalised to avoid a name clash with \pkg{pstricks}; the
+% alternative \cs{ssquare} is also provided.
+%\begin{LaTeXexample}
+%  \SI{10}{\metre\squared}\\
+%  \SI{20}{\Square\metre}\\
+%  \SI{30}{\metre\cubed}\\
+%  \SI{40}{\cubic\metre}
+%\end{LaTeXexample}
+%
+%\DescribeMacro{\per}
+% The \cs{per} macro intelligently creates reciprocal powers, and
+% also adds the power $-1$ when appropriate.
+%\begin{LaTeXexample}
+%  \SI{10}{\per\second\squared}\\
+%  \SI{20}{\per\Square\second}\\
+%  \SI[per=frac,fraction=nice]{30}{\per\second\cubed}\\
+%  \SI[per=slash]{40}{\per\cubic\second}\\
+%  \SI{50}{\per\second}\\
+%  \SI{60}{\per\metre\Square\candela}
+%\end{LaTeXexample}
+%
+%\DescribeMacro{\tothe}
+%\DescribeMacro{\raiseto}
+% For powers not defined above or with \cs{newpower}, the \cs{tothe}
+% macro can be used ``in line'' to produce a power.  As follows from
+% standard English usage, this comes after the unit. \cs{raiseto}
+% achieves the same, but is used \emph{before} a unit to add a power
+% \emph{after}.\footnote{\cs{raiseto} acts in the same way as
+% \cs{tothe} when used in a literal context: the power will be
+% produced where the macro is, rather than moving after the next
+% item.}
+%\begin{LaTeXexample}
+%  \SI{16.86}{\metre\tothe{4}}\\
+%  \SI{7.895}{\raiseto{-6}\newton}\\
+%  \SI{1.34}{\per\kelvin\tothe{7}}
+%\end{LaTeXexample}
+%
+%\subsection{Units with no values}
+%\DescribeMacro{\si}
+% For typesetting the symbol for a unit on its own, with the full
+% font control and without extra spaces, the \cs{si} macro is
+% provided.\footnote{The same effect can be achieved using the
+% \cs{SI} macro with an empty numerical argument.}  The macro name
+% avoids a clash with the functionality of the earlier packages, but
+% is similar to \cs{ilu} from the \unitsdef package.
+%\begin{LaTeXexample}
+%  \SI{}{kg.m/s^2}\\
+%  \si{kg.m/s^2}\\
+%  \si[mode=text,unitsep=thin]{\mole\per\cubic\deci\metre}
+%\end{LaTeXexample}
+%
+%\subsection{Free-standing units}
+% Users of the \unitsdef package will be a accustomed to using unit
+% macros on their own (following a value) or with an optional
+% argument containing a number.  In both cases, only a single unit
+% macro could be used. \currpkg supports both operation modes, with
+% the limitation that units trailing values loose font control of the
+% value.  When used in this way, the units \emph{do not} take an
+% optional \pkg{keyval} argument.
+%\begin{LaTeXexample}
+%  \sisetup{prespace,allowoptarg}
+%  123\metre\\
+%  \kelvin[123]\\
+%  \sisetup{mode=text} \ampere[234]\\
+%  6\second
+%\end{LaTeXexample}
+%
+%\subsection{Pre-defined units, prefixes and powers}
+%\newcommand*{\csindex}[1]{^^A
+%  \cs{#1}^^A
+%  \expandafter\SpecialUsageIndex\csname#1\endcsname}
+%\newcommand*{\unitinfo}[1]{^^A
+%  #1 & \csindex{#1} &
+%  \expandafter\si\expandafter{\csname#1\endcsname}}
+%\begin{table}
+%  \caption{The seven base SI units}
+%  \label{tab:baseunits}
+%  \centering
+%  \begin{tabular}{lll}
+%    \toprule
+%      \multicolumn{1}{c}{Unit} &
+%      \multicolumn{1}{c}{Macro} &
+%      \multicolumn{1}{c}{Symbol} \\
+%    \midrule
+%    \unitinfo{kilogram}\\
+%    \unitinfo{metre}\\
+%    \unitinfo{second}\\
+%    \unitinfo{mole}\\
+%    \unitinfo{kelvin}\\
+%    \unitinfo{ampere}\\
+%    \unitinfo{candela}\\
+%    \bottomrule
+%  \end{tabular}
+%\end{table}
+%\DescribeMacro{\metre}
+%\DescribeMacro{\meter}
+% The package always defines the seven base SI units, irrespective of
+% any package options given (\ref{tab:baseunits}). The kilogram is
+% notable as by default it is a \emph{base} unit with a prefix. Thus,
+% when the package is loaded with the option \opt{load=\{\}},
+% \cs{kilo} and \cs{gram} \emph{are not defined}.  As metre is often
+% spelled as ``meter'' in the US, the macro \cs{meter} is provided in
+% addition to the \cs{metre} macro.\footnote{The official SI spelling
+% for the unit is ``metre''.}
+%
+% By default, a number of additional definitions are created by the
+% package.  These are controlled by the \opt{load} and \opt{noload}
+% options. Unless specifically requested with the option
+% \opt{noload=prefix}, \currpkg defines the standard prefixes for
+% powers of ten (\ref{tab:prefix}).  This leads to the redefinition
+% of \cs{kilogram} as \cs{kilo}\cs{gram}.  The macro \cs{deka} is
+% provided, as this is used as an alias for \cs{deca} in some places.
+% The package also defines a number of derived SI units which have
+% assigned names and symbols (\ref{tab:derived}). Note that \cs{Gray}
+% is capitalised to avoid a name clash with the \pkg{pstricks}
+% package.\footnote{The macros \cs{ohm} and \cs{celsius} are not
+% defined by \currpkg if the \pkg{gensymb} package is loaded.}
+%\newcommand*{\prefixunitsym}[1]{\si[prefixsymbolic=false]{#1}}
+%\newcommand*{\prefixinfo}[1]{^^A
+%  #1 & \csindex{#1} &
+%    \expandafter\prefixunitsym\expandafter{\csname#1\endcsname} &
+%    \expandafter\si\expandafter{\csname#1\endcsname}}
+%\begin{table}
+%  \caption{The SI prefixes (\opt{load=prefix})}
+%  \label{tab:prefix}
+%  \centering
+%  \begin{tabular}{lllclllc}
+%    \toprule
+%      \multicolumn{1}{c}{Prefix} &
+%      \multicolumn{1}{c}{Macro} &
+%      \multicolumn{1}{c}{Power} &
+%      Symbol &
+%      \multicolumn{1}{c}{Prefix} &
+%      \multicolumn{1}{c}{Macro} &
+%      \multicolumn{1}{c}{Power} &
+%      Symbol \\
+%    \midrule
+%    \prefixinfo{yocto} &
+%    \prefixinfo{deca} \\
+%    \prefixinfo{zepto} &
+%    \prefixinfo{hecto} \\
+%    \prefixinfo{atto} &
+%    \prefixinfo{kilo} \\
+%    \prefixinfo{femto} &
+%    \prefixinfo{mega} \\
+%    \prefixinfo{pico} &
+%    \prefixinfo{giga} \\
+%    \prefixinfo{nano} &
+%    \prefixinfo{tera} \\
+%    \prefixinfo{micro} &
+%    \prefixinfo{peta} \\
+%    \prefixinfo{milli} &
+%    \prefixinfo{exa} \\
+%    \prefixinfo{centi} &
+%    \prefixinfo{zetta} \\
+%    \prefixinfo{deci} &
+%    \prefixinfo{yotta} \\
+%    \bottomrule
+%  \end{tabular}
+%\end{table}
+%\begin{table}
+%  \caption{The derived SI units with defined names
+%    (\opt{load=derived})}
+%  \label{tab:derived}
+%  \centering
+%  \begin{tabular}{llllll}
+%    \toprule
+%      \multicolumn{1}{c}{Unit} &
+%      \multicolumn{1}{c}{Macro} &
+%      \multicolumn{1}{c}{Symbol} &
+%      \multicolumn{1}{c}{Unit} &
+%      \multicolumn{1}{c}{Macro} &
+%      \multicolumn{1}{c}{Symbol} \\
+%    \midrule
+%    \unitinfo{becquerel} &
+%    \unitinfo{newton} \\
+%    \unitinfo{celsius} &
+%    \unitinfo{ohm} \\
+%    \unitinfo{coulomb} &
+%    \unitinfo{pascal} \\
+%    \unitinfo{farad} &
+%    \unitinfo{radian} \\
+%    \unitinfo{Gray} &
+%    \unitinfo{siemens} \\
+%      & \csindex{ggray} & \ggray &
+%    \unitinfo{sievert} \\
+%    \unitinfo{hertz} &
+%    \unitinfo{steradian} \\
+%    \unitinfo{henry} &
+%    \unitinfo{tesla} \\
+%    \unitinfo{joule} &
+%    \unitinfo{volt} \\
+%    \unitinfo{katal} &
+%    \unitinfo{watt} \\
+%    \unitinfo{lumen} &
+%    \unitinfo{weber} \\
+%    \unitinfo{lux} \\
+%    \bottomrule
+%  \end{tabular}
+%\end{table}
+%
+% In addition to these units, there are three other groups of units
+% for use with the SI system which do not fit into the above.  These
+% are those derived from physical measurements
+% (\ref{tab:experimental}), those considered ``accepted''
+% (\ref{tab:accepted}), and those accepted temporarily
+% (\ref{tab:addn}).\footnote{These are supposed to be replaced over
+% time by SI units.}
+%\DescribeMacro{\litre}
+%\DescribeMacro{\liter}
+% The unit ``litre'' is often spelled ``liter'' in the US; both
+% spellings are provided by \currpkg, with \cs{liter} giving
+% \si{\liter} and \cs{litre} producing \si{\litre}.
+%\begin{table}
+%  \caption{Units derived from experiments
+%    (\opt{load=physical})}
+%  \label{tab:experimental}
+%  \centering
+%  \begin{tabular}{lll}
+%    \toprule
+%      \multicolumn{1}{c}{Unit} &
+%      \multicolumn{1}{c}{Macro} &
+%      \multicolumn{1}{c}{Symbol} \\
+%    \midrule
+%    electron volt & \csindex{electronvolt} & \electronvolt \\
+%    unified atomic mass unit
+%      & \csindex{atomicmassunit} & \atomicmassunit \\
+%      & \csindex{atomicmass} & \atomicmass \\
+%    \bottomrule
+%  \end{tabular}
+%\end{table}
+%\begin{table}
+%  \caption{Units accepted for use with SI
+%    (\opt{load=accepted})}
+%  \label{tab:accepted}
+%  \centering
+%  \begin{tabular}{lll}
+%    \toprule
+%      \multicolumn{1}{c}{Unit} &
+%      \multicolumn{1}{c}{Macro} &
+%      \multicolumn{1}{c}{Symbol} \\
+%    \midrule
+%    \unitinfo{bel} \\
+%    day & \csindex{Day} & \Day \\
+%     & \csindex{dday} & \dday \\
+%    \unitinfo{degree} \\
+%    \unitinfo{hour} \\
+%    \unitinfo{litre} \\
+%     & \csindex{liter} & \liter \\
+%    \unitinfo{minute} \\
+%    minute (arc) & \csindex{arcmin} & \arcmin \\
+%    \unitinfo{neper} \\
+%    \unitinfo{percent} \\
+%    second (arc) & \csindex{arcsec} & \arcsec \\
+%    \unitinfo{tonne} \\
+%    \bottomrule
+%  \end{tabular}
+%\end{table}
+%\begin{table}
+%  \centering
+%  \caption{Additional (temporary) SI units
+%    (\opt{load=addn})}
+%  \label{tab:addn}
+%  \begin{tabular}{lll}
+%    \toprule
+%      \multicolumn{1}{c}{Unit} &
+%      \multicolumn{1}{c}{Macro} &
+%      \multicolumn{1}{c}{Symbol} \\
+%    \midrule
+%    {\aa}ngstr{\"o}m & \csindex{angstrom} & \angstrom \\
+%    \unitinfo{are} \\
+%    \unitinfo{curie} \\
+%    bar & \csindex{BAR} & \BAR \\
+%     & \csindex{bbar} & \bbar \\
+%    \unitinfo{barn} \\
+%    \unitinfo{gal} \\
+%    \unitinfo{hectare} \\
+%    \unitinfo{millibar} \\
+%    \unitinfo{rad} \\
+%    \unitinfo{rem} \\
+%    \unitinfo{roentgen} \\
+%    \bottomrule
+%  \end{tabular}
+%\end{table}
+%
+%\subsection{Prefixed and abbreviated units}
+% Many basic units have prefixes which are commonly used with the
+% unit, such as centimetre or megahertz.  The package therefore
+% defines a number of common prefixed units (\opt{load=prefixed}).
+% Several of these also have obvious abbreviations (such as \cs{MHz}
+% for \cs{megahertz}), which are made available by \opt{load=abbr}.
+% In common with the units discussed above, the prefixed and
+% abbreviated unit definitions are loaded by default.
+%\newcommand*{\tablesubhead}[1]{^^A
+%  \addlinespace \emph{#1} \\*}
+%\begin{longtable}{llll}
+%    \caption{Prefixed (\opt{load=prefixed}) and abbreviated
+%      (\opt{load=abbr}) units\label{tab:abbr}}\\
+%    \toprule
+%    Unit & Macro & Symbol & Abbreviation \\
+%    \midrule
+%  \endfirsthead
+%    \toprule
+%    Unit & Macro & Symbol & Abbreviation \\
+%    \midrule
+%  \endhead
+%    \bottomrule
+%    \multicolumn{4}{r}{\emph{Continued on next page}}
+%  \endfoot
+%    \bottomrule
+%  \endlastfoot
+%
+%  \tablesubhead{Masses}
+%  \unitinfo{kilogram} & \csindex{kg} \\
+%  \unitinfo{femtogram} & \csindex{fg} \\
+%  \unitinfo{picogram} & \csindex{pg} \\
+%  \unitinfo{nanogram} & \csindex{nanog} \\
+%  \unitinfo{microgram} & \csindex{micg} \\
+%  \unitinfo{milligram} & \csindex{mg} \\
+%  atomic mass & \csindex{atomicmass} & \amu & \csindex{amu} \\
+%
+%  \tablesubhead{Lengths}
+%  \unitinfo{picometre} & \csindex{picom} \\
+%  \unitinfo{nanometre} & \csindex{nm} \\
+%  \unitinfo{micrometre} & \csindex{micm} \\
+%  \unitinfo{millimetre} & \csindex{mm} \\
+%  \unitinfo{centimetre} & \csindex{cm} \\
+%  \unitinfo{decimetre} & \csindex{dm} \\
+%  \unitinfo{kilometre} & \csindex{km} \\
+%
+%  \tablesubhead{Times}
+%  \unitinfo{second} & \csindex{Sec} \\
+%  \unitinfo{attosecond} & \csindex{as} \\
+%  \unitinfo{femtosecond} & \csindex{fs} \\
+%  \unitinfo{picosecond} & \csindex{ps} \\
+%  \unitinfo{nanosecond} & \csindex{ns} \\
+%  \unitinfo{microsecond} & \csindex{mics} \\
+%  \unitinfo{millisecond} & \csindex{ms} \\
+%
+%  \tablesubhead{Moles}
+%  \unitinfo{femtomole} & \csindex{fmol} \\
+%  \unitinfo{picomole} & \csindex{pmol} \\
+%  \unitinfo{nanomole} & \csindex{nmol} \\
+%  \unitinfo{micromole} & \csindex{micmol} \\
+%  \unitinfo{millimole} & \csindex{mmol} \\
+%
+%  \tablesubhead{Currents}
+%  \unitinfo{picoampere} & \csindex{pA} \\
+%  \unitinfo{nanoampere} & \csindex{nA} \\
+%  \unitinfo{microampere} & \csindex{micA} \\
+%  \unitinfo{milliampere} & \csindex{mA} \\
+%  \unitinfo{kiloampere} & \csindex{kA} \\
+%
+%  \tablesubhead{Areas}
+%  square centimetre & \csindex{squarecentimetre} &
+%    \squarecentimetre & \csindex{cms} \\*
+%    & \csindex{centimetresquared} & \centimetresquared \\
+%  square metre & \csindex{squaremetre} & \squaremetre \\
+%  square kilometre & \csindex{squarekilometre} & \squarekilometre \\
+%
+%  \tablesubhead{Volumes}
+%  \unitinfo{microlitre} & \csindex{micl} \\
+%  \unitinfo{millilitre} & \csindex{ml} \\
+%  cubic centimetre & \csindex{cubiccentimetre} &
+%    \cubiccentimetre & \csindex{cmc} \\*
+%    & \csindex{centimetrecubed} & \centimetrecubed \\
+%  cubic decimetre & \csindex{cubicdecimetre} &
+%    \cubicdecimetre & \csindex{dmc} \\
+%
+%  \tablesubhead{Frequencies}
+%  \unitinfo{hertz} & \csindex{Hz} \\
+%  \unitinfo{millihertz} & \csindex{mHz} \\
+%  \unitinfo{kilohertz} & \csindex{kHz} \\
+%  \unitinfo{megahertz} & \csindex{MHz} \\
+%  \unitinfo{gigahertz} & \csindex{GHz} \\
+%  \unitinfo{terahertz} & \csindex{THz} \\
+%
+%  \tablesubhead{Potentials}
+%  \unitinfo{millivolt} & \csindex{mV} \\
+%  \unitinfo{kilovolt} & \csindex{kV} \\
+%
+%  \tablesubhead{Energies}
+%  \unitinfo{kilojoule}  & \csindex{kJ}\\
+%  \unitinfo{electronvolt} & \csindex{eV} \\
+%  \unitinfo{millielectronvolt} & \csindex{meV} \\
+%  \unitinfo{kiloelectronvolt} & \csindex{keV} \\
+%  \unitinfo{megaelectronvolt} & \csindex{MeV} \\
+%  \unitinfo{gigaelectronvolt} & \csindex{GeV} \\
+%  \unitinfo{teraelectronvolt} & \csindex{TeV} \\
+%  \unitinfo{kilowatthour} & \cs{kWh} \\
+%
+%  \tablesubhead{Powers}
+%  \unitinfo{milliwatt} \\
+%  \unitinfo{kilowatt} \\
+%  \unitinfo{megawatt} \\
+%
+%  \tablesubhead{Capacitances}
+%  \unitinfo{femtofarad} \\
+%  \unitinfo{picofarad} \\
+%  \unitinfo{nanofarad} \\
+%  \unitinfo{microfarad} \\
+%  \unitinfo{millifarad} \\
+%
+%  \tablesubhead{Resistances}
+%  \unitinfo{kiloohm} \\
+%  \unitinfo{megaohm} \\
+%  \unitinfo{gigaohm} \\
+%  \unitinfo{millisiemens} \\
+%
+%  \tablesubhead{Forces}
+%  \unitinfo{millinewton} \\
+%  \unitinfo{kilonewton} \\
+%
+%  \tablesubhead{Other units}
+%  \unitinfo{hectopascal} \\
+%  \unitinfo{megabecquerel} \\
+%  \unitinfo{millisievert} \\
+%\end{longtable}
+%
+%\subsection{Defining new units}
+%\DescribeMacro{\newunit}
+%\DescribeMacro{\renewunit}
+%\DescribeMacro{\provideunit}
+% New units are produced using the \cs{newunit} macro.  This works as
+% might be expected:
+% \cs{newunit}\oarg{options}\marg{unit}\marg{symbol}, where
+% \meta{symbol} can contain literal values, other units, multiple
+% prefixes, powers and \cs{per}.  The \meta{options} argument can be
+% any suitable options, and applies the specific unit macro only. The
+% most obvious example for using this macro is the \cs{degree}
+% unit.\footnote{Although the \cs{ang} macro is preferred for this
+% job.}  The (first) optional argument to \cs{SI} and \cs{si} can be
+% used to override the settings for the unit.  The \cs{renewunit} and
+% \cs{provideunit} macros take the same arguments.
+%\begin{LaTeXexample}
+%  \SI{3.1415}{\degree}\\
+%  \newunit[valuesep=none]{\oddunit}{XXX}
+%  \SI{12345}{\oddunit}
+%  \SI[valuesep=thick]{67890}{\oddunit}
+%\end{LaTeXexample}
+%
+% As with the \LaTeX\ commands \cs{newcommand}, \etc, the choice of
+% \cs{newunit}, \cs{renewunit} or \cs{provideunit} depends on the
+% presence of an existing definition.  While \cs{newunit} should be
+% used when a unit has not been previously defined, \cs{renewunit}
+% will issue a warning if the named unit does not already exist.
+% \cs{provideunit} defines the unit if it does not exist, and
+% otherwise does nothing at all.  The same behaviour is seen with
+% \cs{providepower} and \cs{provideprefix} (\latin{vide infra}).
+%
+% Output that is only valid in maths mode requires \cs{ensuremath},
+% text-only input requires \cs{text}.  In the example below,
+% \cs{mathnormal} is used to force the font choice only for the
+% single character.\footnote{The \cs{mathrm} font used for this
+% document has an ``\ss'' at the $\pi$ position.}
+%\begin{LaTeXexample}
+%  \newunit{\SIpi}{\ensuremath{\mathnormal{\pi}}}
+%  \SI{10}{\metre\per\SIpi\squared}
+%\end{LaTeXexample}
+%
+%\DescribeMacro{\newpower}
+%\DescribeMacro{\renewpower}
+%\DescribeMacro{\providepower}
+% Powers are defined:
+% \cs{newpower}\ofixarg{post}\marg{power}\marg{num}. Here,
+% \meta{power} is the name of the power macro and \meta{num} is the
+% (positive) number it represents.  The later argument is always
+% processed internally by \cs{num}, but \emph{must} be a number.
+% Giving the optional argument \opt{post} indicates to the package
+% that the power will come after the unit it applies to; by default
+% it is assumed that it will come before.
+%\begin{LaTeXexample}
+%  \newpower{\quartic}{4}
+%  \newpower[post]{\totheforth}{4}\\
+%  \si{\kilogram\totheforth}\\
+%  \si{\quartic\metre}
+%\end{LaTeXexample}
+%
+%\DescribeMacro{\newprefix}
+%\DescribeMacro{\renewprefix}
+%\DescribeMacro{\provideprefix}
+% The standard SI powers of ten are defined by the package, and are
+% described above.  However, the user can define new prefixes with
+% \cs{newprefix}.  This has syntax
+% \cs{newunit}\ofixarg{binary}\marg{prefix}\marg{symbol}\marg{powers-ten},
+% where \meta{powers-ten} is the number of powers of ten the prefix
+% represents.  When the \opt{binary} option is given, the prefix is a
+% power of two.  For example, \cs{kilo} and \cs{kibi} are defined:
+%\begin{LaTeXexample}[noexample]
+%  \newprefix{\kilo}{k}{3}
+%  \newprefix[binary]{\kibi}{Ki}{10}
+%\end{LaTeXexample}
+%
+%\section{Specialist units}
+% In some subject area, there are units which are in common use even
+% though they are outside of the SI system.  Unlike the units
+% discussed earlier, these specialist units are not loaded by
+% default.  In each case, they should be requested with the option
+% \opt{alsoload=\meta{name}}.
+%
+%\subsection{Binary units (\opt{binary})\label{sec:binary}}
+%\DescribeMacro{\bit}
+%\DescribeMacro{\byte}
+% The binary prefixes, \cs{bit}, \cs{byte} (\ref{tab:binary}) are not
+% formally part of the SI system. They are available by giving the
+% \opt{alsoload=binary} option.
+%\begin{LaTeXexample}
+%  \SI{100}{\mebi\byte}
+%\end{LaTeXexample}
+%\begin{table}
+%  \caption{Binary prefixes
+%    (\opt{alsoload=binary})}
+%  \label{tab:binary}
+%  \centering
+%  \begin{tabular}{lllc}
+%    \toprule
+%      \multicolumn{1}{c}{Prefix} &
+%      \multicolumn{1}{c}{Macro} &
+%      \multicolumn{1}{c}{Power} &
+%      Symbol \\
+%    \midrule
+%      \prefixinfo{kibi} \\
+%      \prefixinfo{mebi} \\
+%      \prefixinfo{gibi} \\
+%      \prefixinfo{tebi} \\
+%      \prefixinfo{pebi} \\
+%      \prefixinfo{exbi} \\
+%    \bottomrule
+%  \end{tabular}
+%\end{table}
+%
+%\subsection{Synthetic chemistry (\opt{synchem})}
+%\DescribeMacro{\mmHg}
+%\DescribeMacro{\molar}
+%\DescribeMacro{\Molar}
+%\DescribeMacro{\torr}
+%\DescribeMacro{\dalton}
+% The \opt{synchem} file adds the common chemistry units \cs{mmHg},
+% \cs{molar}, \cs{Molar}, \cs{torr} and \cs{dalton} to \currpkg.  The
+% \cs{Molar} macro is somewhat awkward, as it can be given as either
+% ``\textsc{m}'' or ``M''.  The later is obviously easily confused
+% with the sign for the prefix mega.  By default, \currpkg uses the
+% UK default of a small-caps symbol.  The \cs{dalton} unit is defined
+% here as this name is not recognised by the various international
+% bodies: the symbol \si{\amu} is preferred.
+%\begin{LaTeXexample}
+%  \SI{1}{\Molar} HCl\\
+%  \SI{760}{\torr}\\
+%  \SI{0.01}{\mmHg}\\
+%  \SI{3.0}{\molar}\\
+%  \SI{106.42}{\dalton}
+%\end{LaTeXexample}
+%
+%\subsection{High-energy physics (\opt{hep})}
+% In contrast to \pkg{hepunits}, \currpkg does not define a long list
+% of compound units for high-energy physics.\footnote{Using the
+% \opt{emulate=hepunits} option will load a file defining those.}
+% Instead, a small selection of new units are defined
+% (\ref{tab:hep}).  The mechanisms provided by \currpkg should avoid
+% the need for large numbers of abbreviations.  For example, the
+% \pkg{hepunits} \cs{MinveV} can be given as |\per\MeV| in \currpkg,
+% which requires only one more character.
+%\begin{table}
+%  \caption{High-energy physics units (\opt{alsoload=hep})}
+%  \label{tab:hep}
+%  \centering
+%  \begin{tabular}{lllc}
+%    \toprule
+%    Unit & Macro & Symbol & Abbreviation \\
+%    \midrule
+%    \addlinespace \emph{Areas} \\
+%    \unitinfo{yoctobarn} & \csindex{yb} \\
+%    \unitinfo{zeptobarn} & \csindex{zb} \\
+%    \unitinfo{attobarn} & \csindex{ab} \\
+%    \unitinfo{femtobarn} & \csindex{fb} \\
+%    \unitinfo{picobarn} & \csindex{pb} \\
+%    \unitinfo{nanobarn} & \csindex{nb} \\
+%    \addlinespace \emph{Other units} \\
+%    \unitinfo{micron} \\
+%    millirad & \csindex{mrad} & \mrad \\
+%    \unitinfo{gauss} \\
+%    \bottomrule
+%  \end{tabular}
+%\end{table}
+%
+%\DescribeMacro{\clight}
+%\DescribeMacro{\eVperc}
+% The \opt{hep} option defines two units which are slightly unusual.
+% \cs{clight} gives \clight, which is recognised as a unit when used
+% in the appropriate circumstances. The second unit provided is
+% \cs{eVperc}, which is commonly-used and clear enough for a compound
+% definition. Notice that the value of \opt{eVcorrb} will need to be
+% adjusted when using this unit.
+%\begin{LaTeXexample}
+%  \SI[per=slash,eVcorrb=0.4ex]{4.657}{\mega\eVperc\squared}
+%\end{LaTeXexample}
+%
+%\subsection{Astronomy (\opt{astro})}
+%\DescribeMacro{\parsec}
+%\DescribeMacro{\lightyear}
+% For astronomers, the \cs{parsec} and \cs{lightyear} units are
+% available, and give the obvious results.
+%\begin{LaTeXexample}
+%  \SI{12}{\parsec}\\
+%  \SI{1}{\lightyear}
+%\end{LaTeXexample}
+%
+%\section{Font control}
+% Following the lead of \SIstyle, \currpkg provides control over the
+% font used to typeset output.  By default, all text is typeset using
+% the current upright serif maths font, whether the macros are given
+% in text or maths mode.  Some examples will show the effect.
+%\begin{LaTeXexample}
+%  \num{10} $\num{10}$\\
+%  \sffamily \ang{20} $\ang{20}$\\
+%  \textbf{\SI{30}{\kilo\gram}}\\
+%  \boldmath $\SI{40}{\kilo\gram}$
+%  \[ \num{50} \]
+%\end{LaTeXexample}
+%
+% In contrast, by setting \opt{obeyall}, the current font is used:
+% this may be maths or text, depending on the context.
+%\begin{LaTeXexample}
+%  \sisetup{obeyall}\\
+%  \ang{1;1;1} $\ang{1;1;1}$\\
+%  \sffamily \ang{2;2;2} $\ang{2;2;2}$\\
+%  \textbf{\ang{3;3;3}} \boldmath $\ang{3;3;3}$\\
+%  \emph{\ang{4;4;4}} \emph{$\ang{4;4;4}$}
+%  \[ \ang{5;5;5} \]
+%\end{LaTeXexample}
+%
+% Fine control of which elements of the local font are used is
+% available with the \opt{obeyfamily}, \opt{obeybold},
+% \opt{obeyitalic} and \opt{obeymode} options.
+%\begin{LaTeXexample}
+%  \sisetup{obeyfamily}\\
+%  \ang{1;1;1} $\ang{1;1;1}$\\
+%  \sffamily \ang{2;2;2} $\ang{2;2;2}$\\
+%  \sisetup{obeybold}
+%  \textbf{\ang{3;3;3}} \boldmath $\ang{3;3;3}$\\
+%  \emph{\ang{4;4;4}} \emph{$\ang{4;4;4}$}
+%  \[ \ang{5;5;5} \]
+%\end{LaTeXexample}
+%
+%\section{Package options\label{sec:options}}
+%\DescribeMacro{\sisetup}
+% The ``native'' options for the package are all given using the
+% key--value method. Most of the package options can be given both
+% when loading the package and at any point in the document.  This is
+% achieved using the \cs{sisetup} macro.
+%
+% The package options take a number of different forms.
+%\begin{itemize}
+%  \item \opt{option=\meta{bool}} Simple true/false values.  These
+%    macros all default to \opt{option=true}, meaning that giving the
+%    option name along will set the appropriate flag.
+%  \item \opt{option=\meta{choice}} Take a single item from a
+%    pre-determined list. Depending on the value, one or more
+%    internal states will be altered.  Values not on the list are
+%    ignored (with a warning).
+%  \item \opt{option=\meta{choice,literal}} If the given value is a
+%    \meta{choice}, then the internal settings for that choice are
+%    used.  Any other value is used directly.
+%  \item \opt{option=\meta{literal}} The given value is used as a
+%    literal by the package.
+%  \item \opt{option=\meta{csname}} These options expect a command
+%    sequence as a value.
+%  \item \opt{option=\meta{length}} Requires a \TeX\ length, for
+%    example \opt{0.5ex}.
+%  \item \opt{option=\meta{list}} Takes a list of one or more items,
+%    which are not determined in advance.
+%  \item \opt{option=\meta{number}} Takes a number (possibly
+%    including an exponent part).
+%\end{itemize}
+%
+% The package has a large range of options, to allow full control of
+% the various features of the package.  These control differing
+% aspects of the package, and are given below in groups based on
+% function.  Where the key has a default value, it is given in bold.
+%
+%\subsection{Font family and style}
+% The font used when typesetting material can be tightly controlled
+% using \currpkg.  A number of options affect how the package matches
+% the surrounding font, and the font families used to achieve this.
+% The default is to use the current upright maths serif font with no
+% variation.
+%
+%\DescribeOption{mode}
+%\DescribeOption{textmode}
+%\DescribeOption{valuemode}
+%\DescribeOption{unitmode}
+%\DescribeOption{obeymode}
+% The output of \currpkg can occur using either text or maths mode.
+% The package option \opt{mode} determines which is used: valid
+% options are \defaultopt{maths} and \opt{text}.\footnote{Here and in
+% all other cases, either UK or US spelling may be used.  Thus
+% \opt{mode=maths} or \opt{mode=math} have exactly the same effect.}
+% The shortcut \opt{textmode} is provided for setting \opt{mode=text}
+% quickly. Further refinement is possible using the \opt{valuemode}
+% and \opt{unitmode} options.  These apply to numbers (the output of
+% \cs{num} and the first mandatory argument of \cs{SI}) and units
+% (all other output), respectively. By setting the \opt{obeymode}
+% flag, the package will use the local typesetting mode (maths or
+% text).
+%
+%\DescribeOption{obeyall}
+%\DescribeOption{obeyfamily}
+%\DescribeOption{obeybold}
+%\DescribeOption{obeyitalic}
+% The detection and matching of surrounding text can be controlled
+% using a number of Boolean package options. \opt{obeyall} turns on
+% all of the detection.  Thus output with \opt{obeyall} in force will
+% always match the local text appearance.  \opt{obeyfamily} instructs
+% the package on detecting the surrounding font family (Roman, sans
+% serif, fixed width), but does not detect bold or italic.
+% \opt{obeybold} detects the local bold setting, whilst
+% \opt{obeyitalic} picks up italic fonts.
+%
+% Bold detection is influenced by the value of \opt{inlinebold},
+% which takes values \defaultopt{text} and \opt{maths}.  The package
+% can detect the local value of bold for either the surrounding text,
+% or the surrounding inline (|$|\ldots|$|) maths.  The
+% \opt{obeyitalic} option does \emph{not} have the same facility
+% (maths is italic anyway).
+%
+%\DescribeOption{mathsrm}
+%\DescribeOption{mathssf}
+%\DescribeOption{mathstt}
+%\SpecialOptionIndex{mathrm}
+%\SpecialOptionIndex{mathsf}
+%\SpecialOptionIndex{mathtt}
+%\DescribeOption{textrm}
+%\DescribeOption{textsf}
+%\DescribeOption{texttt}
+% The font commands used by the package to achieve the above are all
+% available for user modification.  The options \opt{mathsrm},
+% \opt{mathssf} and \opt{mathstt} hold the command sequences used in
+% maths mode,\footnote{These can also be set using \opt{mathrm},
+% \opt{mathsf} and \opt{mathtt}} while \opt{textrm}, \opt{textsf} and
+% \opt{texttt} do the same for text mode.  By default, these contain
+% the obvious command names, for example \opt{mathsrm=mathrm} and
+% \opt{texttt=ttfamily}.  However, they can be set at will: the macro
+% names indicate the nature of the surrounding text detected.  For
+% example, the value of \opt{mathssf} is used in maths mode when the
+% surrounding text is sans serif.
+%
+%\SpecialOptionIndex{valuemathsrm}
+%\SpecialOptionIndex{valuemathssf}
+%\SpecialOptionIndex{valuemathstt}
+%\SpecialOptionIndex{valuemathrm}
+%\SpecialOptionIndex{valuemathsf}
+%\SpecialOptionIndex{valuemathtt}
+%\SpecialOptionIndex{unitmathsrm}
+%\SpecialOptionIndex{unitmathssf}
+%\SpecialOptionIndex{unitmathstt}
+%\SpecialOptionIndex{valuetextrm}
+%\SpecialOptionIndex{valuetextsf}
+%\SpecialOptionIndex{valuetexttt}
+%\SpecialOptionIndex{valuetextrm}
+%\SpecialOptionIndex{valuetextsf}
+%\SpecialOptionIndex{valuetexttt}
+%\SpecialOptionIndex{unittextrm}
+%\SpecialOptionIndex{unittextsf}
+%\SpecialOptionIndex{unittexttt}
+% Each of the font options can be given separately for the contents
+% of numbers and units.  The option names include \opt{value} or
+% \opt{unit} before the mode name.  For example, the \opt{mathsrm}
+% option may be split into \opt{valuemathsrm} and \opt{unitmathsrm}.
+%
+%\DescribeOption{detectdisplay}
+% The font detection system can treat displayed mathematical content
+% in two ways.  This is controlled by the \opt{detectdisplay} option.
+% When set to \defaultopt{true}, display mathematics is treated
+% independently from the body of the document.  Thus the local
+% \emph{maths} font is checked for matching.  In contrast, when set
+% to \opt{false}, display material is treated with the current
+% running text font.
+%\begin{LaTeXexample}
+%  \sffamily
+%  Some text
+%  \sisetup{obeyall}
+%  \[ x = \SI{1.2e3}{\kg\kelvin\candela} \]
+%  More text
+%  \sisetup{detectdisplay=false}
+%  \[ y = \SI{3}{\metre\second\mole} \]
+%\end{LaTeXexample}
+%
+%\subsection{Spacing and separators}
+%\DescribeOption{unitsep}
+%\DescribeOption{valuesep}
+%\DescribeOption{digitsep}
+%\DescribeOption{anglesep}
+% The separators between items can all be set using options taking a
+% list of pre-defined items or a literal value.  The ``\opt{sep}''
+% options (\opt{unitsep}, \opt{valuesep}, \opt{digitsep} and
+% \opt{anglesep}) all recognise \opt{thin}, \opt{medium}, \opt{med},
+% \opt{thick}, \opt{space}, \opt{cdot}, \opt{times}, \opt{tightcdot},
+% \opt{tighttimes}, \opt{fullstop}, \opt{stop}, \opt{period} and
+% \opt{none}.  The named spaces are the normal maths separations,
+% with \opt{space} representing a full (non-breakable text) space,
+% and with the obvious meanings for \opt{cdot} and \opt{times}.  The
+% \opt{tight} variants reduce the spacing available. Three possible
+% values are provided for ``|.|'', and \opt{none} yields no space at
+% all. In all cases, other values are treated literally and are
+% typeset in maths mode.  The default value is \defaultopt{thin} for
+% all separations except \opt{anglesep}, which is set to
+% \defaultopt{none}.
+%
+%\DescribeOption{unitspace}
+%\DescribeOption{errspace}
+% The \opt{unitspace} and \opt{errspace} options again take a list
+% or literal value, but only the ``real'' spaces \opt{thin},
+% \opt{medium}, \opt{med}, \opt{thick}, \opt{space} and \opt{none}
+% are recognised in the list. The \opt{unitspace} option controls the
+% output generated by an explicit space (|~|) inside a unit macro,
+% while \opt{errspace} is used to separate a bracketed error from the
+% main number.
+%
+%\subsection{Number formatting}
+%\DescribeOption{numdigits}
+%\DescribeOption{numdecimal}
+%\DescribeOption{numexp}
+%\DescribeOption{numsign}
+%\DescribeOption{numaddn}
+%\DescribeOption{numgobble}
+% There are two groups of options for formatting numbers.  The first
+% group all begin with ``\opt{num}'', and take literal values used by
+% the package to parse numbers.  \opt{numdigits} contains the valid
+% number symbols (\defaultopt{0123456789}), with \opt{numdecimal}
+% containing the decimal markers (\defaultopt{.,}).  As in the
+% \numprint package, \opt{numexp} (the list of exponent markers)
+% recognises \defaultopt{deDE} as valid by default.  \opt{numsign}
+% contains the sign markers for numbers
+% (\defaultopt{+-\cs{pm}\cs{mp}}).  \opt{numaddn} and
+% \opt{numgobble} both control which other characters do not give an
+% error when present in a number.  \opt{numaddn} contains valid
+% characters which should be included in the final output ``as is'',
+% whereas \opt{numgobble} lists the characters that are completely
+% ignored.  In all cases, the content of the options is a simple
+% string, for example \opt{numdigits=1234567890}.
+%
+%\DescribeOption{decimalsymbol}
+%\DescribeOption{digitsep}
+%\DescribeOption{sepfour}
+% The second group of number options control the output of numbers
+% after parsing. The symbol used by \currpkg as a decimal marker is
+% set by the \opt{decimalsymbol} option, which can take a list of
+% choices or a literal.  The valid choices here are
+% \defaultopt{fullstop}, \opt{comma}, \opt{cdot} and
+% \opt{tightcdot}.\footnote{\opt{fullstop} also has aliases
+% \opt{stop} and \opt{period}.}  Notice that this does not have to
+% agree with the input marker.  The other separator for numerical
+% output is the division of digits into groups of three.  The result
+% is dependant on two options.  The previously-described
+% \opt{digitsep} option controls the spacing added between groups of
+% three numbers.  For numbers consisting of exactly four digits, the
+% \opt{sepfour} Boolean option controls whether separation occurs in
+% these cases.  The default is \defaultopt{false}.
+%\begin{LaTeXexample}
+%  \num{1234}\\
+%  \num[sepfour]{1234}
+%\end{LaTeXexample}
+%
+%\DescribeOption{seperr}
+%\DescribeOption{numopenerr}
+%\DescribeOption{numcloseerr}
+% For numbers given with an error [\eg \num{1.23(4)}], the package
+% can separate out the error part, to give for example
+% \num[seperr]{1.23(4)}.  This behaviour is activated by the
+% \opt{seperr} option, and requires that \opt{numopenerr} and
+% \opt{numcloseerr} contain the left- and right-hand delimiters for
+% the error [defaults \opt{numopenerr=(} and \opt{numcloseerr=)}].
+%\begin{LaTeXexample}
+%  \sisetup{seperr}\\
+%  \num{1.234(5)}\\
+%  \num{1.234(5)e6}
+%\end{LaTeXexample}
+%\DescribeOption{trapambigerr}
+%\DescribeOption{openerr}
+%\DescribeOption{closeerr}
+%\DescribeOption{tightpm}
+% If the number has an exponent, or if units are not repeated, then
+% the result can be considered ambiguous.  By default, the package
+% adds the markers stored in \opt{openerr} and \opt{closeerr} to
+% remove the ambiguity; the options have the same default values as
+% the input error markers.  Detection of a potentially-ambiguous
+% error is controlled by the \opt{trapambigerr} option, although for
+% numbers with units the \opt{repeatunits} option is also important.
+% The spacing around the $\pm$ sign is normally set by \TeX. However,
+% using the \opt{tightpm} option will cause this to be reduced to a
+% minimum.
+%\begin{LaTeXexample}
+%  \sisetup{seperr}\\
+%  \num[trapambigerr=false]{1.234(5)e6}\\
+%  \SI{1.234(5)}{\metre}\\
+%  \sisetup{repeatunits=false}
+%  \SI{1.234(5)}{\metre}\\
+%  \SI[trapambigerr=false]{1.234(5)}{\metre}\\
+%  \num[tightpm]{1.234(5)}
+%\end{LaTeXexample}
+%
+%\DescribeOption{numprod}
+%\DescribeOption{repeatunits}
+% The number processor can recognise products in the numerical input;
+% the symbols used for products are stored in \opt{numprod}, with the
+% default value of ``\opt{x}''.  By default, the \cs{SI} macro will
+% repeat the units for a number given in this way.  This behaviour is
+% altered  by the \opt{repeatunits} option, which takes the values
+% \defaultopt{true}, \opt{false} and \opt{power}.  The later applies
+% only when providing multiplied numbers with units, and converts the
+% unit to the appropriate power rather than repeating the
+% units.\footnote{This is a very simply option: do not expect it to
+% work with anything except areas and volumes.} Notice that when
+% applied to errors, \opt{repeatunits} takes priority over
+% \opt{trapambigerr}.
+%\begin{LaTeXexample}
+%  \num{1 x 2 x 3}\\
+%  \SI{4 x 5 x 6}{\metre}\\
+%  \sisetup{repeatunits=false}
+%  \SI{1.2 x 3.4 x 5.6}{\milli\metre\cubed}\\
+%  \SI[seperr]{1.234(5)}{\metre}\\
+%  \SI[seperr,
+%    trapambigerr=false]
+%    {9.1093897(54)e-31}{\kilo\gram}\\
+%  \SI[seperr,repeatunits,
+%    trapambigerr=false]
+%    {9.1093897(54)e-31}{\kilo\gram}\\
+%  \SI[repeatunits=power]{1 x 2 x 3}{\metre}
+%\end{LaTeXexample}
+%
+%\DescribeOption{expproduct}
+%\DescribeOption{expbase}
+%\DescribeOption{allowzeroexp}
+% The formatting of exponents is controlled by \opt{expproduct} and
+% \opt{expbase}.  \opt{expproduct} sets the symbol used to indicate a
+% product for exponents (\eg the $\times$ in \num{2e2}), while the
+% value of \opt{expbase} sets the power used (the \num{10} in the
+% example).  Both options accept a very short list of options:
+% \defaultopt{times}, \opt{tighttimes}, \opt{cdot} and
+% \opt{tightcdot} for the product, and \defaultopt{ten} and \opt{two}
+% for the power.\footnote{The \opt{tighttimes} and \opt{tightcdot}
+% options give the rather questionable results:
+% \num[expproduct=tighttimes]{1e2} and
+% \num[expproduct=tightcdot]{1e2}, as opposed to \num{1e2} and
+% \num[expproduct=cdot]{1e2}.} Other choices are used literally. Also
+% relevant to exponent processing is the \opt{allowzeroexp} option.
+% By default, the package will suppress a zero exponent, but setting
+% the flag will allow the output of \num[allowzeroexp]{e0}.
+%
+%\DescribeOption{addsign}
+%\DescribeOption{sign}
+%\DescribeOption{retainplus}
+% Additions to the input can take the form of implicit signs and
+% padded zeros.  The \opt{addsign} option takes a list of potential
+% sites to add a sign: \defaultopt{none}, \opt{mantissa},
+% \opt{exponent} and \opt{both}.\footnote{Aliases are provided:
+% \opt{mant} = \opt{mantissa}, \opt{exp} = \opt{exponent}, \opt{all}
+% = \opt{true} = \opt{both}, \opt{false} = \opt{none}.}  If no sign
+% is given in the input, the setting here determines if one is added.
+% The sign to add is stored in \opt{sign}, which takes the list of
+% choices \defaultopt{plus}, \opt{minus}, \opt{pm} and \opt{mp}, or
+% uses the input literally (in maths mode).  For positive numbers,
+% the \opt{retainplus} option causes a $+$ sign explicitly in the
+% input to be retained.  By default, the package will remove such
+% signs.
+%
+%\DescribeOption{padnumber}
+% The \opt{padnumber} option controls the addition of zeros to the
+% input, to ``pad'' the result.  The option takes a list of choices:
+% \defaultopt{leading}, \opt{trailing}, \opt{both} and
+% \opt{none}.\footnote{Aliases: \opt{all} = \opt{true} = \opt{both},
+% \opt{false} = \opt{none}.}  No additional precision is added by
+% this option; integer input will not add a decimal point.
+%\begin{LaTeXexample}
+%  \num[padnumber=leading]{.1}\\
+%  \num[padnumber=leading]{2.}\\
+%  \num[padnumber=trailing]{3.}\\
+%  \num[padnumber=both]{4.}\\
+%  \num[padnumber=both]{.5}\\
+%  \num[padnumber=both]{6}\\
+%  \num[padnumber=none]{7.}\\
+%  \num[padnumber=none]{.8}
+%\end{LaTeXexample}
+%
+%\DescribeOption{fixdp}
+%\DescribeOption{dp}
+% In contrast to the \opt{padnumber} option, the package can alter
+% the precision of the input number if the \opt{fixdp} option is set.
+% The will fix the decimal places of the output to the number stored
+% in the \opt{dp} option.  The later should be a positive integer.
+%\begin{LaTeXexample}
+%  \sisetup{fixdp,dp=3}
+%  \num{1}\\
+%  \num{53.9}\\
+%  \num{4.56783}\\
+%  \num{-1.2942}\\
+%  \num{-1.2949}\\
+%  \num{9.9999}
+%\end{LaTeXexample}
+%
+%\subsection{Angle formatting}
+%\DescribeOption{padangle}
+%\DescribeOption{strictarc}
+% The angle formatter uses \cs{num} to format numbers: any options
+% for numbers are therefore applicable here.  The \opt{padangle}
+% option takes choices \defaultopt{small}, \opt{large}, \opt{all} and
+% \opt{none}, and controls how angles are padded when given in
+% degrees, minutes and seconds.\footnote{Aliases: \opt{all} =
+% \opt{true} = \opt{both}, \opt{false} = \opt{none}.}  When giving
+% angles as arcs (in degrees, minutes and seconds), the package can
+% detect if the correct number of semi-colons have been given. This
+% is controlled by the \opt{strictarc} option, which is a Boolean
+% switch with a \defaultopt{true} default.  With \opt{strictarc} set
+% to \opt{false}, an incomplete arc is interpreted as degrees and
+% minute, while an over-complete one will drop excess input.
+%\begin{LaTeXexample}
+%  \ang[padangle=none]{1;;}\\
+%  \ang[padangle=large]{2;;}\\
+%  \ang[padangle=small]{3;;}\\
+%  \ang[padangle=both]{;4;}\\
+%  \ang[padangle=none]{;5;5}\\
+%  \ang[strictarc=false]{1;2}\\
+%  \ang[strictarc=false]{1;2;3;4;}
+%\end{LaTeXexample}
+%
+%\DescribeOption{angformat}
+% The angle formatting system can convert between decimal angles and
+% those given as degrees, minutes and seconds.  This is controlled by
+% the \opt{angformat} option, which takes choices
+% \defaultopt{unchanged}, \opt{decimal} and
+% \opt{arc}.\footnote{Aliases: \opt{decimal} = \opt{dec}, \opt{arc} =
+% \opt{dms}, \opt{unchanged} = \opt{none}.}  When set to
+% \opt{unchanged}, nothing is done to the input.  The conversion is
+% based on \TeX\ dimensions, and is therefore limited in accuracy.
+% For this reason, the output is automatically rounded: output as a
+% decimal angle is limited to three places, and that as an arc is
+% given to a single decimal place for the seconds component.
+%\begin{LaTeXexample}
+%  $\ang{1;2;3} = \ang[angformat=dec]{1;2;3}$\\
+%  $\ang{4.56} = \ang[angformat=arc]{4.56}$
+%\end{LaTeXexample}
+%
+%\DescribeOption{astroang}
+% For astronomers, the \opt{astroang} option is provided.  This
+% moves the degrees, minutes or seconds symbol (as appropriate)
+% over the decimal marker rather than after the number.
+%\begin{LaTeXexample}
+%  \ang{1;2;3.4}\\
+%  \ang[astroang]{5;6;7.8}
+%\end{LaTeXexample}
+%
+%\subsection{Tabular material}
+%\DescribeOption{tabnumalign}
+% Material typeset in |S| columns is processed internally by the
+% \cs{num} macro.  Thus, as with angles, the number options also
+% apply here.  The positioning of tabular material is controlled by
+% the two options \opt{tabnumalign} and \opt{tabformat}.
+% \opt{tabnumalign} takes values \defaultopt{centredecimal},
+% \opt{centre}, \opt{left} and \opt{right}.\footnote{Aliases
+% \opt{centerdecimal} = \opt{centredecimal}; \opt{center} =
+% \opt{centre}.}  When using \opt{centredecimal}, the package places
+% the decimal marker of the mantissa at the centre of the column,
+% which then grows to accommodate the widest number given.  For equal
+% numbers of digits before and after the decimal sign, this is the
+% easiest option.  The other choices use a fixed-width box to store
+% the number; the box is then aligned with the edges of the column.
+%
+%\DescribeOption{tabformat}
+% The \opt{tabformat} option sets the amount of space reserved by
+% \currpkg for the alignment box when not using the
+% \opt{centredecimal} setting of \opt{tabnumalign}.  The numerical
+% parts of \opt{tabformat} are interpreted as
+% \texttt{\meta{pre}\meta{dec}\meta{post}}; \meta{pre} and
+% \meta{post} are the number of digits before and after the decimal
+% sign, respectively.  Both signs and exponents can be included in
+% \opt{tabformat}, resulting in appropriate space being reserved. The
+% entire \opt{tabformat} input is processed using the \cs{num} macro
+% internally.  Thus the decimal and exponent signs used in
+% \opt{tabformat} are checked against \opt{numdecimal} and
+% \opt{numexp}, respectively.
+%
+%\DescribeOption{tabalignexp}
+% When \opt{tabformat} contains exponents, two possibilities are
+% available for alignment.  The first method is to place the exponent
+% parts so that the ``$\times 10$'' parts form a column, with
+% whitespace after shorter mantissa components.  In the second
+% method, no additional space is added after the mantissa, and the
+% exponents do no line up (\ref{tab:alignexp}).  This is controlled
+% by the \opt{tabexpalign} option, which can be set to
+% \defaultopt{true} or \opt{false}.
+%\begin{LaTeXexample}[float]
+%  \begin{table}
+%    \centering
+%    \caption{The \opt{tabalignexp} option}
+%    \label{tab:alignexp}
+%    \sisetup{tabformat=1.3e2,tabnumalign=centre}
+%    \begin{tabular}{SS[tabalignexp=false]}
+%      \toprule
+%      {Header} & {Header} \\
+%      \midrule
+%      1.2e3    & 1.2e3    \\
+%      1.234e56 & 1.234e56 \\
+%      \bottomrule
+%    \end{tabular}
+%  \end{table}
+%\end{LaTeXexample}
+%
+%\DescribeOption{tabtextalign}
+%\DescribeOption{tabunitalign}
+%\DescribeOption{tabalign}
+% Cells containing no numbers are handled by \currpkg in a manner
+% similar to \cs{multicolumn}.  The setting of \opt{tabtextalign} is
+% taken from the list \defaultopt{centre}, \opt{right} and
+% \opt{left}.\footnote{Alias \opt{centre} = \opt{center}.}  As would
+% be expected, these settings centre, right- or left-align the cell
+% contents. In |s| columns, all content is treated as input to the
+% \cs{si} macro.  The alignment of the contents relative to the cell
+% is controlled by the \opt{tabunitalign} option, which takes options
+% \defaultopt{left}, \opt{right} and \opt{centre}.  The settings for
+% \opt{tabnumalign}, \opt{tabtextalign} and \opt{tabunitalign} can be
+% set to the same value in one go with the \opt{tabalign} option.
+%
+%\DescribeOption{tabautofit}
+% The contents of table cells can automatically be rounded or
+% zero-filled to the number of decimal places given in
+% \opt{tabformat}.  The is activated by the \opt{tabautofit} Boolean
+% option. As \opt{tabformat} does not apply to columns with alignment
+% \opt{centredecimal}, \opt{tabautofit} is also inactive for these
+% columns (\ref{tab:autofit}).
+%\begin{LaTeXexample}[float]
+%  \begin{table}
+%    \centering
+%    \caption{The \opt{tabautofit} option}
+%    \label{tab:autofit}
+%    \sisetup{tabformat=1.3,tabnumalign=centre}
+%    % Notice the overfull hbox which results with
+%    % the first column
+%    \begin{tabular}{%
+%      S%
+%      S[tabautofit]%
+%      S[tabautofit,tabnumalign=centredecimal]}
+%      \toprule
+%      {Header} & {Header} & {Header} \\
+%      \midrule
+%      1.2    & 1.2    & 1.2    \\
+%      1.2345 & 1.2345 & 1.2345 \\
+%      \bottomrule
+%    \end{tabular}
+%  \end{table}
+%\end{LaTeXexample}
+%
+%\subsection{Units}
+%\DescribeOption{per}
+% Most of the unit options are concerned with the processing of named
+% units.  The processor for units given as macro names can be
+% influenced to give a variety of output formats.  The \opt{per}
+% option defines how the keyword macro \cs{per} is handled.  This
+% option takes a choice from the list \defaultopt{reciprocal},
+% \opt{slash} and \opt{fraction}.\footnote{Aliases \opt{reciprocal} =
+% \opt{rp} = \opt{power}, \opt{fraction} = \opt{frac}.}  The default
+% option uses \cs{per} to indicate reciprocal powers, whereas
+% \opt{slash} causes the package to use ``$/$'' to show division.
+%
+%\DescribeOption{fraction}
+%\DescribeOption{slash}
+% The \opt{fraction} option defines how \opt{per=fraction} is
+% interpreted.  The list of applicable values here is
+% \defaultopt{frac}, \opt{nice}, \opt{ugly} and \opt{sfrac}.  In each
+% case, the unit is typeset as a fraction, but the macro use to
+% achieve this varies. \opt{frac} uses the \TeX\ \cs{frac}, macro,
+% while \opt{nice} makes use of a \cs{nicefrac}-like method.  The
+% \opt{ugly} option uses a slash in text mode and \cs{frac} in maths
+% mode.\footnote{Similar to the \pkg{ugly} option of the
+% \pkg{nicefrac} package.}  Finally, the setting \opt{fraction=sfrac}
+% uses the \cs{sfrac} macro from the \pkg{xfrac} package, when
+% available.\footnote{\pkg{xfrac} is part of the experimental system
+% for \LaTeX3.  As it requires a number of additional packages to
+% work, \currpkg does not load \pkg{xfrac}. If it is unavailable, the
+% \opt{sfrac} setting will fall back to using \cs{nicefrac}.  See the
+% \pkg{xfrac} documentation for reasons to prefer \cs{sfrac} to
+% \cs{nicefrac}.}  The \opt{slash} option sets the symbol used when
+% \opt{per=slash} is in force.  This recognises the single keyword
+% \opt{slash}; anything else is used literally.
+%\begin{LaTeXexample}
+%  \sisetup{per=fraction}
+%  \si[fraction=frac]{\metre\per\second}\\
+%  \si[fraction=nice]{\metre\per\second}\\
+%  \si[fraction=sfrac]{\metre\per\second}\\
+%  \si[per=slash]{\metre\per\second}
+%\end{LaTeXexample}
+%
+%\DescribeOption{stickyper}
+% By default, \cs{per} applies only to the next unit
+% given.\footnote{This is the standard method of reading units in
+% English: for example, \si{\joule\per\mole\per\kelvin} is pronounced
+% ``joules per mole per kelvin''.}  By setting the \opt{stickyper}
+% flag, this behaviour is changed so that \cs{per} applies to all
+% subsequent units.\footnote{This is the behaviour in \SIunits.}
+%\begin{LaTeXexample}
+%  \si{\kilogram\per\metre\ampere}\\
+%  \si[stickyper]{\kilogram\per\metre\ampere}
+%\end{LaTeXexample}
+%
+%\DescribeOption{trapambigfrac}
+%\DescribeOption{openfrac}
+%\DescribeOption{closefrac}
+% When using \opt{per=slash}, multiple units in the denominator will
+% yield a potentially ambiguous result.  The \opt{trapambigfrac}
+% determines whether the package checks for this: this takes
+% \defaultopt{true} and \opt{false}.  When set, the contents of
+% \opt{openfrac} are inserted before the denominator, and
+% \opt{closefrac} is inserted after.
+%\begin{LaTeXexample}
+%  \sisetup{trapambigfrac,openfrac=(,closefrac=),per=slash}\\
+%  \si{\metre\per\second\per\kilogram}\\
+%  \si[trapambigfrac=false]{\metre\per\second\per\kilogram}
+%\end{LaTeXexample}
+%
+%\DescribeOption{prefixsymbolic}
+%\DescribeOption{prefixbase}
+%\DescribeOption{prefixproduct}
+% The unit prefixes (\cs{kilo}, \etc) are normally given as letters.
+% However, the package can convert these into numerical
+% powers.\footnote{Provided things are not too complex!}  This is
+% controlled by the \opt{prefixsymbolic} Boolean option, which by
+% default is \defaultopt{true}.  If \opt{prefixsymboli} is set to
+% \opt{false}, the format of the prefix is controlled by
+% \opt{prefixbase} and \opt{prefixproduct}, which work in the same
+% way as \opt{expbase} and \opt{expproduct}.
+%
+%\DescribeOption{prespace}
+%\DescribeOption{xspace}
+%\DescribeOption{allowoptarg}
+% By default, the single unit macros (\eg \cs{metre}) add no space
+% either before or after the unit.  Setting the \opt{xspace} flag to
+% true means that the single macros are followed by the \cs{xspace}
+% command (when used outside of \cs{SI}/\cs{si}).  For users of
+% \unitsdef, the \opt{prespace} macro changes the behaviour of the
+% unit macros, so that they can immediately follow a number.  As a
+% result, the unit macros will \emph{always} be preceded by a fixed
+% space when the \opt{prespace} flag is true: this will be in
+% addition to any other space. Also relevant to users moving from
+% \unitsdef is the \opt{allowoptarg} option.  This allows single unit
+% macros to take an optional numerical argument, in the same way that
+% occurs in that package.
+%\begin{LaTeXexample}
+%  \metre is the symbol for metres\\
+%  \sisetup{xspace}
+%  No, \metre is the correct symbol\\
+%  \sisetup{prespace}
+%  30\metre\\
+%  Do not use \metre in running text\\
+%  \sisetup{allowoptarg}
+%  \metre[40]
+%\end{LaTeXexample}
+%
+%\subsection{Symbols}
+% User access to control the symbols used for \si{\ohm}, \si{\micro},
+% \si{\degree}, \si{\arcmin}, \si{\arcsec}, \si{\angstrom} and
+% \si{\celsius} is provided here. These are all literal options,
+% which are available in text and maths mode variants.  For example,
+% \opt{textmicro} is the code used for the \si{\micro} symbol in text
+% mode.  The text mode macros should be safe when forced into text,
+% and the maths ones when forced into maths.  The symbols defined in
+% this way are:
+%\newcommand*{\listsymbopt}[1]{\item \opt{#1}\SpecialOptionIndex{#1}}
+%\begin{itemize}
+%  \listsymbopt{textOmega};
+%  \listsymbopt{mathsOmega};
+%  \listsymbopt{textmu};
+%  \listsymbopt{mathsmu};
+%  \listsymbopt{textdegree};
+%  \listsymbopt{mathsdegree};
+%  \listsymbopt{textminute};
+%  \listsymbopt{mathsminute};
+%  \listsymbopt{textsecond};
+%  \listsymbopt{mathssecond};
+%  \listsymbopt{textringA};
+%  \listsymbopt{mathsringA};
+%  \listsymbopt{textcelsius};
+%  \listsymbopt{mathscelsius}.
+%\end{itemize}
+%
+%\DescribeOption{redefsymbols}
+% When \currpkg is loaded, it can check for the presence of the
+% \pkg{textcomp} and \pkg{upgreek} packages, to provide better
+% symbols for certain items. To prevent this, set the
+% \opt{redefsymbols} option \opt{false} (the default is
+% \defaultopt{true}).
+%
+%\DescribeOption{eVcorra}
+%\DescribeOption{eVcorrb}
+% The \si{\electronvolt} symbol requires some fine-tuning, and so has
+% two options of its own, both \TeX\ lengths.  \opt{eVcorra} is the
+% correction applied to the gap between ``e'' and ``V'' of the unit:
+% the default is \defaultopt{0.3ex}. \opt{eVcorrb} is the correction
+% applied to the gap between ``V'' of the unit and whatever follows;
+% the default is \defaultopt{0ex}.  The optimal value for these
+% options will depend on the current font settings.\footnote{This
+% document uses \opt{eVcorra=0.1ex}.}
+%\begin{LaTeXexample}
+%  \si[per=slash]{\electronvolt\per\metre}\\
+%  \si[per=slash,eVcorrb=0.7ex]{\electronvolt\per\metre}
+%\end{LaTeXexample}
+%
+%\subsection{Colour}
+%\DescribeOption{colourall}
+%\DescribeOption{colourunits}
+%\DescribeOption{colourvalues}
+%\SpecialOptionIndex{colorall}
+%\SpecialOptionIndex{colorunit}
+%\SpecialOptionIndex{colorvalue}
+% The package provides internal hooks for applying colour to part or
+% all of the output.  This requires the user to load the \pkg{color}
+% or \pkg{xcolor} package to support colour in the output; \currpkg
+% will ignore a colour request if support is unavailable. The Boolean
+% options \opt{colourall}, \opt{colourunits} and \opt{colourvalues}
+% are used to turn application of a given colour on or off for all
+% output, only units and only values, respectively.  All three
+% switches are available with US spelling, \eg \opt{colorall} and
+% \opt{colourall} behave in the same way.  With colour turned off, no
+% \cs{color} command is issued internally, and output follows the
+% surrounding text.
+%
+%\DescribeOption{colour}
+%\DescribeOption{unitcolour}
+%\DescribeOption{valuecolour}
+%\SpecialOptionIndex{color}
+%\SpecialOptionIndex{unitcolor}
+%\SpecialOptionIndex{valuecolor}
+% The colour names to use for colouring output are set by the
+% \opt{colour}, \opt{unitcolour} and \opt{valuecolour} options (all
+% also available with US spelling).  The \opt{colour} option
+% internally sets both \opt{unitcolour} and \opt{valuecolour}.
+%\begin{LaTeXexample}
+%  {\color{brown} Text \num{50}}\\
+%  \sisetup{colourall,colour=green}
+%  \SI{10}{\metre}\\
+%  {\color{purple} Text \num{70}}\\
+%  \sisetup{colourunits=true,colourvalues=false}
+%  \SI{40}{\second}
+%\end{LaTeXexample}
+%
+%\DescribeOption{colourneg}
+%\DescribeOption{negcolour}
+%\SpecialOptionIndex{colorneg}
+%\SpecialOptionIndex{negcolor}
+% \currpkg can automatically add a colour to negative numbers.  This
+% is turned on using the \opt{colourneg} switch.  The colour used is
+% set by the \opt{negcolour} option; both options are available using
+% US spellings.
+%
+%\subsection{International support}
+%\DescribeOption{locale}
+% \currpkg allows the user to switch between the typographic
+% conventions of different (geographical) areas by using
+% \latin{locales}.  Currently, the package is supplied with
+% configurations for locales \opt{UK}, \opt{USA}, \opt{DE} (Germany)
+% and \opt{ZA} (South Africa). The \opt{locale} option is used to
+% switch to a particular locale.
+%\begin{LaTeXexample}
+%  \SI{1.234}{\metre}\\
+%  \SI[locale=DE]{6.789}{\metre}
+%\end{LaTeXexample}
+%
+%\DescribeOption{loctolang}
+% Locales are distinct from \pkg{babel} languages, as typographic
+% conventions are not tightly integrated with language.  However, it
+% is useful to be able to associate a particular locale with a
+% \pkg{babel} language.  The option \opt{loctolang} handles this, and
+% expects pairs of values:
+% \opt{loctolang=\meta{locale}:\meta{language}}.
+%\begin{LaTeXexample}
+%  \sisetup{loctolang={UK:UKenglish,DE:german}}\\
+%  \SI{6.022e23}{\per\mole}\\
+%  \selectlanguage{german}\\
+%  \SI{6.022e23}{\per\mole}
+%\end{LaTeXexample}
+%
+%\subsection{Package control}
+%\DescribeOption{load}
+%\DescribeOption{noload}
+%\DescribeOption{alsoload}
+% The package keeps most of the unit and abbreviations definitions in
+% files separate from \file{siunitx.sty}.  To control what is loaded,
+% three complementary options are provided, all of which take a list
+% of one or more choices.  \opt{load} and \opt{alsoload} define which
+% support configuration files are loaded.  The list in \opt{load}
+% recognises the value \opt{default}, which is expanded to the normal
+% list before loading. The difference between \opt{load} and
+% \opt{alsoload} is that \opt{load} specifies the \emph{complete}
+% list of files to load, whereas \opt{alsoload} adds to the existing
+% list. To use the \opt{load} option successfully requires knowing
+% everything that is needed. The \opt{noload} option can be used to
+% delete one or more items from the \opt{load} list, without needing
+% to know what is on it.\footnote{\opt{noload} does not prevent the
+% loading of a file needed by one which is loaded.  Thus the package
+% may internally override a \opt{noload} value if needed.}
+%
+%\DescribeOption{log}
+%\DescribeOption{debug}
+% To control data written to the \ext{log} file, the \opt{log} option
+% is provided.  This takes a value from the list \defaultopt{normal},
+% \opt{none}, \opt{minimal}, \opt{errors} and \opt{debug}.  As would
+% be expected, these indicate the amount of detail written to the log
+% file. As a shortcut to \opt{log=debug}, the package also recognises
+% the \opt{debug} option directly.
+%
+%\DescribeOption{strict}
+% Some users will want to stick closely to the official rules for
+% typesetting units.  This could be made complicated if the options
+% for non-standards behaviour could not be turned off.  The load-time
+% option \opt{strict} resets package behaviour to follow the rules
+% closely, and disables options which deviate from this.  If the
+% package is loaded with the \opt{strict} option, all output is made
+% in maths mode using the upright serif font.
+%
+%\subsection{Back-compatibility options}
+%\DescribeOption{emulate}
+% The package can emulate \SIunits, \SIstyle, \unitsdef, \units,
+% \pkg{hepunits}, \pkg{fancyunits} and \pkg{fancynum}.  Giving the
+% \opt{emulate=\meta{package}} option will give the desired
+% emulation, and combinations which would be possible with the real
+% packages will also work here. The package will recognise the
+% options of the emulated packages.  This will automatically cause
+% emulation to be switched on.
+%
+%\subsection{Summary of all options}
+% \ref{tab:allopt} lists a summary of the package options (excluding
+% those for backward-compatibility).  A reminder or the input format
+% is also provided.
+%\begin{longtable}{>{\ttfamily}lll}
+%    \caption{All package options\label{tab:allopt}}\\
+%    \toprule
+%    Option & Type & Description \\
+%    \midrule
+%  \endfirsthead
+%    \toprule
+%    Option & Type & Description \\
+%    \midrule
+%  \endhead
+%    \bottomrule
+%    \multicolumn{3}{r}{\emph{Continued on next page}}
+%  \endfoot
+%    \bottomrule
+%  \endlastfoot
+%  addsign & List & Add sign to number \\
+%  allowzeroexp & Boolean & Allow \num[allowzeroexp]{e0} \\
+%  angformat & List & Conversion of angle format \\
+%  anglesep & List or literal & Space between angle components \\
+%  astroang & Boolean & Astronomy-style angles \\
+%  closeerr & Literal & Closes potential-ambiguous error \\
+%  closefrac & Literal & Closes potential-ambiguous fraction \\
+%  color & Literal & Colour used for units and values \\
+%  colour & Literal & Colour used for units and values \\
+%  colorall & Boolean & Switch for colouring all output \\
+%  colourall & Boolean & Switch for colouring all output \\
+%  colorneg & Boolean & Colour negative numbers \\
+%  colourneg & Boolean & Colour negative numbers \\
+%  colorunits & Boolean & Switch for colouring units \\
+%  colourunits & Boolean & Switch for colouring units \\
+%  colorvalues & Boolean & Switch for colouring values \\
+%  colourvalues & Boolean & Switch for colouring values \\
+%  decimalsymbol & List or literal & Decimal symbol \\
+%  debug & Boolean & Write debugging data to log \\
+%  detectdisplay & Boolean & Treat display maths separately \\
+%  digitsep & List & Separation of digits in large numbers \\
+%  dp & Integer & Number of decimal places to \\
+%   & & output numbers to \\
+%  emulate & Modules & Emulation modules to load \\
+%  errspace & List & Spacing of bracketed error \\
+%  eVcorra & Length & Spacing correction in \eV \\
+%  eVcorrb & Length & Spacing correction after \eV \\
+%  expbase & List or Literal & Base used for exponents \\
+%  expproduct & List or literal & Product sign for exponents \\
+%  fixdp & Boolean & Switch for fixing decimal \\
+%   & & places of numbers \\
+%  fraction & List & Method used when setting \opt{per=frac} \\
+%  inlinebold & List & Select how inline bold is tested \\
+%  load & Modules & Modules to load \\
+%  locale & Modules & Locale to follow \\
+%  loctolang & Special & Associate locale with \pkg{babel}
+%    language \\
+%  log & List & Amount of data added to log \\
+%  mathOmega & Literal & ``$\makeatletter\si@mathsOmega\makeatother$''
+%    symbol in maths mode \\
+%  mathcelsius & Literal & ``$\makeatletter\si@mathscelsius\makeatother$''
+%    symbol in maths mode \\
+%  mathdegree & Literal & ``$\makeatletter\si@mathsdegree\makeatother$''
+%    symbol in maths mode \\
+%  mathminute & Literal & ``$\makeatletter\si@mathsminute\makeatother$''
+%    symbol in maths mode \\
+%  mathmu & Literal & ``$\makeatletter\si@mathsmu\makeatother$''
+%    symbol in maths mode \\
+%  mathringA & Literal & ``$\makeatletter\si@mathsringA\makeatother$''
+%    symbol in maths mode \\
+%  mathrm & Csname & Roman maths font \\
+%  mathsOmega & Literal & ``$\makeatletter\si@mathsOmega\makeatother$''
+%    symbol in maths mode \\
+%  mathscelsius & Literal & ``$\makeatletter\si@mathscelsius\makeatother$''
+%    symbol in maths mode \\
+%  mathsdegree & Literal & ``$\makeatletter\si@mathsdegree\makeatother$''
+%    symbol in maths mode \\
+%  mathsecond & Literal & ``$\makeatletter\si@mathssecond\makeatother$''
+%    symbol in maths mode \\
+%  mathsf & Csname & Sans serif maths font \\
+%  mathsminute & Literal & ``$\makeatletter\si@mathsminute\makeatother$''
+%    symbol in maths mode \\
+%  mathsmu & Literal & ``$\makeatletter\si@mathsmu\makeatother$''
+%    symbol in maths mode \\
+%  mathsringA & Literal & ``$\makeatletter\si@mathsringA\makeatother$''
+%    symbol in maths mode \\
+%  mathsrm & Csname & Roman maths font \\
+%  mathssecond & Literal & ``$\makeatletter\si@mathssecond\makeatother$''
+%    symbol in maths mode \\
+%  mathssf & Csname & Sans serif maths font \\
+%  mathstt & Csname & Fixed-width maths font \\
+%  mathtt & Csname & Fixed-width maths font \\
+%  mode & List & Use text or maths mode for \\
+%   & & typesetting \\
+%  negcolor & Literal & Colour used for negative numbers \\
+%  negcolour & Literal & Colour used for negative numbers \\
+%  noload & Modules & Modules not to load \\
+%  numaddn & Literal & Additional input allowed in numbers \\
+%  numcloseerr & Literal & Character indicating end of \\
+%   & & numerical error\\
+%  numdecimal & Literal & Decimal symbols in numbers\\
+%  numdigits & Literal & Digit characters in numbers \\
+%  numexp & Literal & Exponent characters in numbers \\
+%  numgobble & Literal & Characters to ignore in numbers \\
+%  numopenerr & Literal & Character indicating start of \\
+%   & & numerical error\\
+%  numprod & Literal & Characters used for a product \\
+%  numsign & Literal & Sign characters in numbers \\
+%  obeyall & Boolean & Combination of \opt{obeybold}, \\
+%   & & \opt{obeyitalic} and \opt{obeymode} \\
+%  obeybold & Boolean & Check local bold setting \\
+%  obeyitalic & Boolean & Check local italic setting \\
+%  obeymode & Boolean & Check local mode (text/maths) \\
+%  openerr & Literal & Opens potentially-ambiguous error \\
+%  openfrac & Literal & Opens potentially-ambiguous fraction \\
+%  padangle & List & Add zeros to blank parts of angles \\
+%  padnumber & List & Add zeros to blank parts of numbers \\
+%  per & List & Behaviour of \cs{per} \\
+%  prefixbase & List or literal & Base used when making prefixes \\
+%   & & numerical \\
+%  prefixproduct & List or literal & Product sign for prefixes \\
+%  prefixsymbolic & Boolean & Behaviour of unit prefixes\\
+%  prespace & Boolean & Add space before units \\
+%  redefsymbols & Boolean & Use better symbols if available \\
+%  repeatunits & List & Repeat units with separated errors \\
+%   & &  and products \\
+%  retainplus & Boolean & Retain explicit plus sign\\
+%  seperr & Boolean & Separate number and error \\
+%  sepfour & Boolean & Separate four-digit numbers \\
+%  sign & List or literal & Sign to add to numbers \\
+%  slash & List or literal & Symbol used for ``/'' \\
+%  stickyper & Boolean & Require \cs{per} only once \\
+%  strict & Boolean & Obey the rules strictly \\
+%  strictarc & Boolean & Require exactly zero or \\
+%   & & two semi-colons \\
+%  tabalign & List & Positioning of all column data \\
+%  tabalignexp & Boolean & Alignment of exponents in tables \\
+%  tabautofit & Boolean & Switch for rounding numbers to \\
+%   & & length given by \opt{tabformat} \\
+%  tabformat & Number & Space reserved in table for numbers \\
+%  tabnumalign & List & Alignment of |S| column numbers \\
+%  tabtextalign & List & Positioning of text in |S| columns \\
+%  tabunitalign & List & Positioning of units in |s| columns \\
+%  textcelsius & Literal & ``$^{\circ}$C'' symbol in text mode \\
+%  textdegree & Literal & ``${\circ}$'' symbol in text mode \\
+%  textminute & Literal & ``$'$'' symbol in text mode \\
+%  textmu & Literal & ``$\upmu$'' symbol in text mode \\
+%  textomega & Literal & ``$\Omega$'' symbol in text mode \\
+%  textringa & Literal & ``\AA'' symbol in maths mode \\
+%  textrm & Csname & Roman text font \\
+%  textsecond & Literal & ``$''$'' symbol in text mode \\
+%  textsf & Csname & Sans serif text font \\
+%  texttt & Csname & Fixed-width text font \\
+%  tightpm & Boolean & Reduce space around $\pm$ \\
+%  trapambigerr & Boolean & Check for ambiguous errors \\
+%  trapambigfrac & Boolean & Check for ambiguous fractions \\
+%  unitcolor & Literal & Switch for colouring units \\
+%  unitcolour & Literal & Switch for colouring units \\
+%  unitmathrm & Csname & Roman maths font for units \\
+%  unitmathsf & Csname & Sans serif maths font for units \\
+%  unitmathsrm & Csname & Roman maths font for units \\
+%  unitmathssf & Csname & Sans serif maths font for units \\
+%  unitmathstt & Csname & Fixed-width maths font for units \\
+%  unitmathtt & Csname & Fixed-width maths font for units \\
+%  unitmode & List &  As \opt{mode}, for units only \\
+%  unitsep & List or literal & Separator for units \\
+%  unitspace & List or literal & Space used for ``|~|'' in units \\
+%  valuecolor & Literal & Switch for colouring value \\
+%  valuecolour & Literal & Switch for colouring value \\
+%  valuemathrm & Csname & Roman maths font for values \\
+%  valuemathsf & Csname & Sans serif maths font for values \\
+%  valuemathsrm & Csname & Roman maths font for values \\
+%  valuemathssf & Csname & Sans serif maths font for values \\
+%  valuemathstt & Csname & Fixed-width maths font for values \\
+%  valuemathtt & Csname & Fixed-width maths font for values \\
+%  valuemode & List &  As \opt{mode}, for values only \\
+%  valuesep & List or literal & Separator between value and unit \\
+%  xspace & Boolean & Use \pkg{xspace} after units \\
+%\end{longtable}
+%
+%\section{Emulation of other packages}
+% \currpkg has been designed as a replacement for \SIunits, \SIstyle,
+% \unitsdef, \units, \pkg{hepunits}, \pkg{fancyunits} and
+% \pkg{fancynum}. It therefore provides options reproduce the
+% functions of all of these packages.  In this way, \currpkg should
+% be usable as a straight replacement for the older
+% packages.\footnote{User macros means that they are described in the
+% package documentation; simply not containing an \texttt{@} does not
+% mean they will have been emulated.}  This means for example that
+% the \cs{num} macro takes an optional star when emulating \SIstyle.
+% However, there are some points that should be remembered.  In
+% particular, \currpkg validates numerical input, meaning that places
+% where a number is expected in the older packages \emph{require} a
+% number when emulated by \currpkg.
+%
+% The \numprint package has provided many useful ideas for the code
+% used here for number formatting. The basic use of the \cs{numprint}
+% (or \cs{np}) macro can be reproduced using \currpkg.  However,
+% \numprint is large and complex, with its own backward-compatibility
+% options.  As a result, emulation of \numprint is not provided here.
+% To use an \numprint document with \currpkg, the \cs{numprint} macro
+% could be provided using the following code.
+%^^A Need to deal with \cs{numprint} being defined.
+%\let\numprint\relax
+%\begin{LaTeXexample}
+%  \newcommand*{\numprint}[2][]{\SI[obeymode]{#2}{#1}}\\
+%  \numprint{-123456} \\
+%  \numprint[N/mm^2]{-123456}
+%\end{LaTeXexample}
+%^^A Back to the normal - with \cs{newcommand}
+%\newcommand*{\numprint}{\pkg{numprint}\xspace}
+%
+% \currpkg can be used more-or-less directly to replace both
+% \pkg{dcolumn} and \pkg{rccol}.  As is explained in the code
+% section, much of the column-alignment system here is taken from
+% \pkg{dcolumn}, while \pkg{rccol} provided a model for a
+% customisable system.  However, neither package has been directly
+% emulated here.  The |S| column type can be used to replace both |D|
+% and |R| columns by setting the appropriate package options.
+%
+%\section{Configuration files}
+% \currpkg is a modular package.  The unit definitions, abbreviations
+% and locales are all stored in configuration files.  These all take
+% names of the form \file{si-\meta{name}.cfg}, where \meta{name} is
+% the part of the filename used as an option in \cs{sisetup} or when
+% loading \currpkg.  Producing new configuration files therefore
+% consists of making a suitably-named file and adding it to the path
+% searched by \TeX.  The files should normally consist of settings
+% (in \cs{sisetup}) and unit definitions, \etc.
+%
+%\DescribeMacro{\addtolocale}
+% To allow arbitrary macros to be stored in locales, the
+% \cs{addtolocale} macro is provided.  This ensures that arbitrary
+% text is only executed when using a locale, not when loading it.
+%
+%\DescribeMacro{\requiresiconfigs}
+% To load one or more configuration files from inside another
+% configuration file, the \cs{requiresiconfigs} macro is provided.
+% This accepts a comma-separated list of configuration names, in the
+% same way as \opt{load} or \opt{noload}.
+%
+% In addition to the various configuration files provided with the
+% package, a local file \file{siunitx.cfg} may be provided.  This is
+% read at the end of loading \currpkg, and allows the user to include
+% any local definitions or settings easily.
+%
+%\section{Common questions}
+%\subsection{Why do I need \cs{per} more than once?}
+% The unit engine of \currpkg is based around the English method for
+% reading units out loud. Thus \si{\joule\per\mole\per\kelvin} is
+% pronounced ``joules per mole per kelvin''.  Hence by default you
+% need to put \cs{per} before each item in the denominator of a unit.
+% The behaviour can be altered by setting the \opt{stickyper} option.
+%
+%\subsection{Why is the order of my units changed?}
+% Then using \opt{per=reciprocal}, the units are typeset as given.
+% However, when using \opt{per=slash} or \opt{per=fraction}, the
+% package needs to find which ones are in the denominator.  It then
+% prints the numerator and denominator separately.  So if you give a
+% unit in the denominator \emph{before} one in the numerator, they
+% have to be re-ordered.\footnote{``Double division''
+% (\SI{1}{s/m/kg}) is mathematically incorrect.}
+%\begin{LaTeXexample}
+%  \SI{88}{\per\kilogram\metre} \\
+%  \SI[per=slash]{66}{\per\kilogram\metre}
+%\end{LaTeXexample}
+%
+%\subsection{Why are compound units not recommended outside of
+%  \cs{SI}/\cs{si}?}
+% To fully process units made up of several parts, the processor has
+% to know where the end of the unit is.  When the unit macros are
+% used outside of \cs{SI}/\cs{si}, this is not the case.  The package
+% therefore does its best, but results may be sub-optimal.  To get
+% consistent results, either define a new \emph{single} unit, or keep
+% compound units inside \cs{SI} and \cs{si}.
+%\begin{LaTeXexample}
+%  \metre\per\micro\second \\
+%  \si{\metre\per\micro\second} \\
+%  \newunit{\myunit}{\metre\per\micro\second}
+%  \myunit
+%  \newunit{\myunittwo}{\kilogram\myunit} \\
+%  \myunittwo \\
+%  \kilogram\myunit
+%\end{LaTeXexample}
+% Notice the difference in behaviour of \cs{per} in the first two
+% lines, and the spacing error on the last line in the example.
+%
+%\subsection{How do I set superscripts to use lining numbers?}
+% Lowercase (``old style'') numbers are favoured by many people for
+% use in running text.  However, this does not necessarily look good
+% in superscripts. The mode used to typeset data can be varied, so
+% that maths mode numbers are used for the unit part of the output.
+%\begin{LaTeXexample}
+%  \SI[mode=text]{1234}{\metre\per\second}\\
+%  \SI[valuemode=text,unitmode=maths]{1234}{\metre\per\second}
+%\end{LaTeXexample}
+%
+%\subsection{Why do most of the examples use
+%  \texorpdfstring{\si{\joule\per\mole\per\kelvin}}{J mol-1 K-1}?}
+% The package author is a chemist, and this is the unit of entropy
+% (disorder).  It nicely demonstrates the use of the \cs{per} macro,
+% and so it crops up a lot.  It is also in the subsection heading
+% here to act as a test with \pkg{hyperref} and moving arguments!
+%
+%\subsection{What can \numprint do that \currpkg cannot?}
+% \currpkg uses a lot of ideas from \numprint: a reasonable amount of
+% the number-processing code here is based on that in \numprint.
+% However, the two packages have somewhat different aims, and as a
+% result there are things that \numprint can do that \currpkg does
+% not implement.  The main features of \numprint not available here
+% are:
+%\begin{itemize}
+%  \item General support for numbers with base other than $10$ (see
+%    \pkg{nbaseprt});
+%  \item Alignment of the decimal marker of powers in tables;
+%  \item Alignment of numbers in running text;
+%  \item Specific formatting commands for \TeX\ counters and lengths.
+%\end{itemize}
+%
+%\section{Tricks and known issues}
+%
+%\subsection{Ensuring maths mode}
+% Due to the possibility of output in either maths or text mode, any
+% input which requires a particular mode needs to be protected.  You
+% cannot use |$|\ldots|$|, as this can get ``caught out'', but also
+% as it may give hard-to-follow errors.  Always use \cs{ensuremath}
+% to force maths processing, and \cs{text} (from the \AMS\TeX\
+% bundle) to ensure text mode.
+%
+%\subsection{Limitations of \cs{mathrm}}
+% The package uses the \cs{mathrm} font family by default to typeset
+% output in maths mode.  This however has a few side-effects.  For
+% example, the Greek alphabet can give odd results.\footnote{This
+% depends on your font setup; this document uses T1 encoding, which
+% shows the issue, whereas using OT1 does not.}  The use of the
+% \cs{mathnormal} font \emph{may} get around this issue.
+%\begin{LaTeXexample}
+%  \num[numaddn=\pi]{4\pi e-7}\\
+%  \num[numaddn=\pi,mathsrm=mathnormal]{4\pi e-7}
+%\end{LaTeXexample}
+% On the other hand, you may want to use text mode, in which case
+% \cs{ensuremath} is needed.  Depending on the exact circumstances,
+% the \LaTeX\ protection mechanism (\cs{DeclareRobustCommand}) may be
+% sufficient; in some cases, this will fail and the \eTeX\
+% \cs{protected} system may be required. There are several potential
+% pitfalls in this area; experimentation may well be needed.
+%\begin{LaTeXexample}
+%  \DeclareRobustCommand*{\numpi}{\ensuremath{\pi}}
+%  \num[numaddn=\numpi,mode=text]{4\numpi e-7}
+%\end{LaTeXexample}
+%
+%\subsection{Entire document in sans serif font}
+% If your entire document is not in a Roman font, using
+% the font detection system is not the most efficient method
+% for setting the \currpkg output.  Instead, the \opt{mathrm}
+% and \opt{textrm} package options can be redefined.
+%\begin{LaTeXexample}
+%  \sffamily
+%  Some text \\
+%  \sisetup{obeyfamily=false,mathrm=mathsf,textrm=sffamily}
+%  \num{1e2} \\
+%  \SI{3}{\newton}
+%  \[ \num{4e5} \si{\pascal} \]
+%\end{LaTeXexample}
+%
+%\subsection{Effects of emulation}
+% The package has been designed so that almost everything can be set
+% using the options.  In the emulation code, some internal macros are
+% redefined.  This is because the legacy packages do odd things,
+% which are deliberately not implemented by \currpkg.  Using an
+% emulation file will prevent subsequent loading of the real package.
+% This is to prevent errors or, worse, difficult to diagnose changes
+% to output.
+%
+%\subsection{Centring columns on non-decimal input}
+% The \pkg{dcolumn} manual suggests using that package to align a
+% column on a $\pm$ sign. The same type of output is possible using
+% \currpkg, but some care is needed (\ref{tab:dcolumn}).  Odd things
+% may happen: use with care!
+%\begin{LaTeXexample}[float]
+%  \begin{table}
+%    \caption{Non-standard \texttt{S} column}
+%    \label{tab:dcolumn}
+%    \centering
+%    \begin{tabular}{%
+%      S[digitsep=none,decimalsymbol={\,\pm\,},
+%        numdigits={0123456789.},numdecimal=+]}
+%    \toprule
+%    {Some Values} \\
+%    \midrule
+%    2.3456  + 0.02  \\
+%    34.2345 + 0.001 \\
+%    56.7835 + 0.067 \\
+%    90.473  + 0.021 \\
+%    \bottomrule
+%    \end{tabular}
+%  \end{table}
+%\end{LaTeXexample}
+%
+%\subsection{Adding items after the last column of a tabular}
+% If you use an |S| or |s| column as the last one in a tabular, and
+% you use the \pkg{array} ``|<|'' construction to add items after it,
+% the spacing may be wrong.  This will occur if the column contents
+% are of differing widths.  Changing the \LaTeX\ |\\| line ending for
+% the plain \TeX\ \cs{cr} will give the correct spacing, but does not
+% allow adjustment of inter-row distance (\ref{tab:cr}).\footnote{For
+% the \TeX\ experts, the issue here is that the system to gather up
+% cell contents is added in using the \texttt{<} construction.
+% Normally, this comes after the cell contents and any other
+% \texttt{<} arguments, so collects the user additions.  However, in
+% the last cell the contents include \texttt{\bslash\bslash}, which
+% is converted to \cs{cr} before gathering can occur.  By using
+% \cs{cr} directly, the gathering process receives all of the cell
+% contents as normal.}  In most cases, this should not be a serious
+% issue.
+%\begin{LaTeXexample}[float]
+%  \begin{table}
+%    \caption{Correcting spacing in last \texttt{S} column}
+%    \label{tab:cr}
+%    \hfil
+%    \begin{tabular}{S<{\,\si{\kg}}S<{\,\si{\kg}}}
+%      \toprule
+%      \multicolumn{1}{c}{Long header} &
+%        \multicolumn{1}{c}{Long header} \\
+%      \midrule
+%      1.23 & 1.23 \\
+%      4.56 & 4.56 \\
+%      7.8  & 7.8  \\
+%      \bottomrule
+%    \end{tabular}
+%    \hfil
+%    \begin{tabular}{S<{\,\si{\kg}}S<{\,\si{\kg}}}
+%      \toprule
+%      \multicolumn{1}{c}{Long header} &
+%        \multicolumn{1}{c}{Long header} \\
+%      \midrule
+%      1.23 & 1.23 \cr
+%      4.56 & 4.56 \cr
+%      7.8  & 7.8  \cr
+%      \bottomrule
+%    \end{tabular}
+%    \hfil
+%  \end{table}
+%\end{LaTeXexample}
+%
+%\iffalse
+%<*bug>
+%\fi
+%\section{Reporting a problem}
+% \currpkg is quite long and complicated, and works hard to cover all
+% possible eventualities.  However, there will be bugs in the code
+% and unexpected interactions with other packages.  If you think you
+% have found a bug, please report it.  A short test-case
+% demonstrating the problem would be very welcome.  The following is
+% a suitable template, and is available as \file{si-bug.ltx} in the
+% \texttt{doc/latex/siunitx} directory or by running the \ext{dtx} or
+% \ext{ins} file through \TeX.
+%    \begin{macrocode}
+\listfiles
+\documentclass{article}
+%    \end{macrocode}
+% Load other packages needed here.
+%    \begin{macrocode}
+\usepackage{siunitx}
+%    \end{macrocode}
+% Normally, debugging the load procedure will not be needed; the
+% debug option here means that all run-time information is logged.
+%    \begin{macrocode}
+\sisetup{debug}
+\begin{document}
+This is the bug test-case document for the \textsf{siunitx}
+package.\\
+Please put your demonstration here, and e-mail to the package
+author.
+\begin{center}
+  \texttt{joseph.wright@morningtar2.co.uk}
+\end{center}
+\end{document}
+%    \end{macrocode}
+%\iffalse
+%</bug>
+%\fi
+%
+%\section{Feature requests}
+% Feature requests for \currpkg are welcome.  The package maintainer
+% will consider any ideas within the remit of the package (units and
+% values).  If suggesting a new feature, an example of how it should
+% work would be appreciated.  If new controls are needed, some
+% suggestions for option names would be welcome.
+%
+%\section{Acknowledgements}
+% Many thanks indeed to Stefan Pinnow, who has made a very large
+% number of suggestions and found numerous bugs in the package.  His
+% contribution to the package has been vital. The package author has
+% learned \LaTeX\ tricks from far too many people to thank all of
+% them.  However, for this package specific thanks must go to the
+% authors of the existing ``unit'' packages: Danie Els (\SIstyle),
+% Marcel Heldoorn (\SIunits), Patrick Happel (\unitsdef), Axel
+% Reichert (\units) and Harald Harders (\numprint).  Will Robertson
+% and Heiko Oberdiek deserve much credit for demonstrating \LaTeX\
+% coding best practice. Victor Eijkhout's excellent (and free)
+% \emph{\TeX\ by Topic} has provided some useful coding hints
+% \cite{Eijkhout}.  The idea for combining and extending unit
+% provision in \LaTeX\ was heavily inspired by Philip Lehmann's
+% \pkg{biblatex}. Thanks to the various contributors of ideas for the
+% package: Donald Arseneau, Michele Dondi, Paul Gans, Ben Morrow, Lan
+% Thuy Pham, Alan Ristow, Patrick Heinze, Andrea Blomenhofer, Morten
+% H{\o}gholm, Burkhard Moddemann  and Patrick Steegstra.
+%
+%\clearpage
+%\part{Correct application of (SI) units}
+%\section{Background}
+% Consistent and logical units are a necessity for scientific work,
+% and have applicability everywhere.  Historically, a number of
+% systems have been used for physical units.  SI units were
+% introduced by the \latin{Conf\'erence G\'en\'erale des Poids et
+% Mesures} (CGPM) in 1960.  SI units are a coherent system based on
+% seven base units, from which all other units may be derived.
+%
+% At the same time, physical quantities with units are mathematical
+% entities, and as such way that they are typeset is important.  In
+% mathematics, changes of type (such as using bold, italic, sans
+% serif typeface and so on) convey information.  This means that
+% rules exist not only for the type of units to be used under the SI
+% system, but also the way they should appear in print.  Advice on
+% best practice has been made available by the \emph{National
+% Institute of Standards and Technology} (NIST) \cite{NIST}.
+%
+% As befits an agreed international standard, the full rules are
+% detailed. It is not appropriate to reproduce these in totality
+% here; instead, a useful summary of the key points is provided. The
+% full details are available from the \latin{Bureau International des
+% Poids et Mesures} (BIPM) in French \cite{BIPM:FR} and English
+% \cite{BIPM:EN}.  They also publish a very useful and detailed guide
+% to using units, values and so on, available online in a number of
+% different formats \cite{BIPM:PDF}.
+%
+% \currpkg takes account of the information given here, so far as is
+% possible.  Thus the package defaults follow the recommendations
+% made for typesetting units and values.  Spacing and so forth is
+% handled in such a way as to make implementing the rules
+% (relatively) easy.
+%
+%\section{Units}
+%\subsection{SI base units}
+% There are seven base SI units, listed in \ref{tab:baseunits}. Apart
+% from the kilogram, these are defined in terms of a measurable
+% physical quantity needing the definition alone.\footnote{Some base
+% units need others defined first; there is therefore a required
+% order of definition.}  The base units have been chosen such that
+% all physical quantities can be expressed using an appropriative
+% combination of these units, needing no others and with no
+% redundancy.  The kilogram is slightly different from the other base
+% units as it is still defined in terms of a ``prototype'' held in
+% Paris.\footnote{At the time of writing, this is under review and
+% will be altered.}
+%
+%\subsection{SI derived units}
+% All other units within the SI system are regarded as ``derived''
+% from the seven base units.  At the most basic, all other SI units
+% can be expressed as combinations of the base units.  However, many
+% units (listed in \ref{tab:derived}, \ref{tab:experimental} and
+% \ref{tab:accepted}) have a special name and symbol.\footnote{The
+% nautical mile has a given name but no agreed symbol, and although
+% accepted by the SI is not provided by \currpkg as a unit macro.}
+% Most of these units are simple combinations of one or more base
+% units (raised to powers as appropriate).  A small number of units
+% derived from experimental data are allowed as SI units
+% (\ref{tab:experimental}).
+%
+% Some of these units (in \ref{tab:accepted}) are regarded as only
+% ``temporarily'' accepted, as the use of only the base and
+% fully-consistent derived units in \ref{tab:derived} is encouraged.
+% They are accepted as they are in common use in one or more
+% disciplines; some are still very widespread in the appropriate
+% areas.  These units are mainly multiples of base units (for
+% example, a tonne is \SI{1000}{\kilo\gram}).
+%
+% One point to note is that ``unitless ratios'' are regarded as
+% having base units which cancel out.  For example, the radian is
+% regarded as having base unit \si{\metre\per\metre}.  The result of
+% this division (``$1$'') is therefore regarded as a derived SI unit
+% in this context.
+%
+%\subsection{SI prefixes}
+% A series of SI prefixes for decimal multiples and submultiples are
+% provided, and can be used as modifiers for any SI unit (either base
+% or derived units) with the exception of the kilogram.  The prefixes
+% are listed in \ref{tab:prefix}.  No space should be used between a
+% prefix and the unit, and only a single prefix should be used.  Even
+% the degree Celsius can be given a prefix, for example
+% \SI{1}{\milli\celsius}.  The only exception to this rule is for
+% degrees, minutes and seconds of an arc: \ang{1;2;3}.
+%
+% It is important to note that the kilogram is the only SI unit with
+% a prefix as part of its name and symbol.  Only  single prefix may
+% be used, and so in the case of the kilogram prefix names are used
+% with the unit name ``gram'' and the prefix symbols are used with
+% the unit symbol \si{\gram}.  For example $\SI{1e-6}{\kilogram} =
+% \SI{1}{\milli\gram}$.
+%
+%\subsection{Other units}
+% The application of SI units is meant to provide a single set of
+% units which ensure consistency and clarity across all areas.
+% However, other units are common is many areas, and are not without
+% merit. The units provided by \currpkg by default do not included
+% any of these; only units which are part of the SI set or are
+% accepted for use with SI units are defined.  However, several other
+% sets of units can be loaded as optional modules. The binary
+% prefixes and units (Section~\ref{sec:binary} and \ref{tab:binary})
+% are the most obvious example.  These are \emph{not} part of the SI
+% specifications, but the prefix names are derived from those in
+% \ref{tab:prefix}.
+%
+% Other units (such as those provided by the modules \opt{synchem},
+% \opt{hep} and \opt{astro}) are normally to be avoided where
+% possible.  SI units should, in the main, be preferred due to the
+% advantages of clear definition and self-consistency this brings.
+% However, there will probably always be a place for specialist or
+% non-standard units.  This is particulary true of units derived from
+% basic physical constants; for example reason, the \opt{hep} module
+% defines the speed of light, \si{\clight}, as a unit.  For work in
+% basic science, a small number of physical constants are recognised
+% as units provided the results for comparison with experiment are
+% given in SI units.
+%
+% There are also many areas where non-standard units are used so
+% commonly that to do otherwise is difficult or impossible.  For
+% example, most synthetic chemists measure the pressure inside vacuum
+% apparatus in \si{\mmHg}, partly because the most common gauge for
+% the task still uses a column of mercury metal.  For these reasons,
+% \currpkg does define non-SI units.
+%
+%\section{Units and values in print}
+%\subsection{Mathematical meaning}
+% As explained earlier, a unit--value combination is a single
+% mathematical entity.  This has implications for how both the number
+% and the unit should be printed.  Firstly, the two parts should not
+% be separated.  With the exception of the symbols for plane angles
+% (\si{\degree}, \si{\arcmin} and \si{\arcsec}), it is usual to have
+% a space between the unit and the value.  This should therefore be a
+% non-breaking space between the two.  Different geographical areas
+% have different conventions on the size of this space; a ``small''
+% space (|\,|) is the \currpkg default.
+%\begin{LaTeXexample}
+%  A space for \SI{10}{\percent}\\
+%  and also for \SI{100}{\celsius}\\
+%  but not for \ang{1.23}.
+%\end{LaTeXexample}
+%
+% The mathematical meaning of units also means that the shape, weight
+% and family are important.  Units are supposed to be typeset in an
+% upright, medium weight serif font.  Italic, bold and sans serif are
+% all used mathematically to convey other meanings.  \currpkg package
+% defaults again follow this convention: any local settings are
+% ignored, and uses the current upright serif maths font.  However,
+% there are occasions where this may not be the most desirable
+% behaviour.  A classic example would be in an all-bold section
+% heading.  As the surrounding text is bold, some people feel that
+% any units should follow this.
+%\begin{LaTeXexample}
+%  Units should \textbf{not be bold: \SI{54}{\farad}}\\
+%  \textbf{But perhaps in a running block,\\
+%  it might look better: \SI[obeybold]{54}{\farad}}
+%\end{LaTeXexample}
+%
+%\subsection{Unit multiplication and division}
+% Symbols for units formed from other units by multiplication are
+% indicated by means of either a half-height (that is, centred) dot
+% or a (thin) space.  This document uses a half-height dot as
+% (\emph{i}) this is the recommendation of \textsc{nist}, amongst
+% others and (\emph{ii}) it avoids potential confusion between unit
+% prefixes and multiplied units.
+%\begin{LaTeXexample}
+%  $\si{\metre\second} = \mbox{metre second}$ \\
+%  $\si{\milli\second} = \mbox{millisecond}$ \\
+%  \sisetup{unitsep=thin}
+%  $\si{\metre\second} = \mbox{metre second}$ \\
+%  $\si{\milli\second} = \mbox{millisecond}$
+%\end{LaTeXexample}
+% There are some circumstances under which it is permissable to omit
+% any spaces.  The classic example is \si{\kWh}, where
+% ``\si[unitsep=thin]{\kWh}'' does not add any useful information.
+% If using such a unit repeatedly, users of \currpkg are advised to
+% create a custom unit to ensure consistency.\footnote{\cs{kWh} and
+% \cs{kilowatthour} are defined by \currpkg in this way.}
+%
+% Symbols for units formed from other units by division are indicated
+% by means of a virgule (oblique stroke, slash, |/|), a horizontal
+% line, or negative exponents.\footnote{Notice that a virgule and a
+% solidus are not the same symbol.}  However, to avoid ambiguity, the
+% virgule must not be repeated on the same line unless parentheses
+% are used. This is ensured when using named unit macros in \currpkg,
+% which will ``trap'' repeated division and format it correctly.  In
+% complicated cases, negative exponents are to be preferred over
+% other formats.
+%\begin{LaTeXexample}
+%  \si{\joule\per\mole\per\kelvin}\\
+%  \si[per=fraction]{\joule\per\mole\per\kelvin}\\
+%  \si[per=slash]{\joule\per\mole\per\kelvin}
+%\end{LaTeXexample}
+%
+%\subsection{Repeating units}
+% Products and errors should show what unit applies to each value
+% given.  Thus \SI{2x3}{\metre} is an ordered set of lengths of a
+% geometric area, whereas \SI[repeatunits=false]{2x3}{\metre} is a
+% length (and equal to \SI{6}{\metre}). Thus, $\times$ is not a
+% product but is a mathematical operator; in the same way, a $2
+% \times 3$ matrix is not a $6$ matrix!  In some areas, areas and
+% volumes are given with separated units but a unit raised to the
+% appropriate power: \SI[repeatunits=power]{2 x 3}{\metre}. Although
+% this does display the correct overall units, it is
+% potentially-confusing and is not encouraged.
+%
+%\subsection{Clarity in writing values of quantities}
+% Care must be taken when writing ranges of numbers.  For purely
+% numerical values, it is common to use a en-dash between values, for
+% example ``see pages 1--5''.  On the other hand, values with units
+% could be misinterpret as negative values if written in this way. As
+% the unit--value combination is a single mathematic entity, writing
+% the values with an en-dash followed by a single unit is also
+% incorrect.  As a result, using the word ``to'' is strongly
+% recommended.
+%\begin{LaTeXexample}
+%  \SI{1}{\metre} to \SI{5}{\metre} long.
+%\end{LaTeXexample}
+%
+%\subsection{Graphs and tables}
+% In tables and graphs, repetition of the units following each entry
+% or axis mark is confusing and repetitive.  It is therefore best to
+% place the unit in the label part of the information.  Placing the
+% unit in square brackets is common but mathematically
+% poor.\footnote{For example, for an acceleration $a$, the expression
+% $[a]$ is the dimensions of $a$, \ie length per time squared in this
+% case.}  Much better is to show division of all values by the unit,
+% which leaves the entries as unitless ratios.  This is illustrated
+% in \ref{tab:label} and \ref{fig:label}.
+%\begin{LaTeXexample}[float]
+%  \begin{table}
+%    \centering
+%    \caption{An example of table labelling}
+%    \label{tab:label}
+%    \begin{tabular}{cS[tabformat=1.4,tabnumalign=centre]}
+%      \toprule
+%      {Entry} & {Length/\si{\metre}} \\
+%      \midrule
+%      1 & 1.1234 \\
+%      2 & 1.1425 \\
+%      3 & 1.7578 \\
+%      4 & 1.9560 \\
+%      \bottomrule
+%    \end{tabular}
+%  \end{table}
+%\end{LaTeXexample}
+%\begin{LaTeXexample}[float]
+%  \begin{figure}
+%    \centering
+%    \begin{tikzpicture}
+%      \begin{axis}[xlabel=$t/\si{\second}$,ylabel=$d/\si{\metre}$]
+%        \addplot[smooth,mark=x]
+%          plot coordinates {
+%            (0,0)
+%            (1,5)
+%            (2,8)
+%            (3,9)
+%            (4,8)
+%            (5,5)
+%            (6,0)
+%           };
+%      \end{axis}
+%    \end{tikzpicture}
+%    \caption{An example of graph labelling}
+%    \label{fig:label}
+%  \end{figure}
+%\end{LaTeXexample}
+%
+% In most cases, adding exponent values in the body of a table is
+% less desirable than adding a fixed exponent to column headers.  An
+% example is shown in \ref{tab:exp}.  The use of \cs{multicolumn} is
+% needed here due to the ``|<|''; without \cs{multicolumn}, the
+% titles are followed by ``\si{\kilo\gram}''!
+%\begin{LaTeXexample}[float]
+%  \begin{table}
+%    \centering
+%    \caption{Good and bad columns}
+%    \label{tab:exp}
+%    \sisetup{tabnumalign=centre}
+%    \begin{tabular}{%
+%      c%
+%      S[tabformat=1.3e1]<{\,\si{\kilogram}}%
+%      S[tabformat=2.2]}
+%      \toprule
+%      Entry & \multicolumn{1}{c}{Mass} &
+%        {Mass/\SI{e3}{\kilogram}} \\
+%      \midrule
+%      1 & 4.56e3  & 4.56 \\
+%      2 & 2.40e3  & 2.40 \\
+%      3 & 1.345e4 & 13.45 \\
+%      4 & 4.5e2   & 0.45 \\
+%      \bottomrule
+%    \end{tabular}
+%  \end{table}
+%\end{LaTeXexample}
+%
+%\bibliographystyle{unsrt}
+%\StopEventually{%
+%  \clearpage
+%  \part{Notes}
+%  \PrintChanges
+%  \PrintIndex
+%  \bibliography{siunitx}}
+%
+% \iffalse
+%<*package>
+% \fi
+%
+%\clearpage
+%\part{Implementation}
+%\section{Main package}
+% Much of the code here is taken, with little or no modification,
+% from the existing packages.  These are all released under the LPPL,
+% and so this use is entirely allowed.  Rather than confuse the
+% source here with repeated references, note that code here could be
+% copied from \SIstyle, \SIunits, \numprint, \unitsdef or \units.
+% Some ideas have also been borrowed from \pkg{biblatex}; again these
+% will not be specifically noted. Code from other packages will be
+% marked when used.
+%
+% User-space commands (those not containing |@|) defined here should
+% give the same result as macros with the same name in the older
+% packages.\footnote{Although extra optional arguments may be added.}
+% However, internal package macros will behave differently; if the
+% user has redefined internal macros, then compatibility will be
+% impaired.
+%
+% The code used here uses \LaTeX\ rather than \TeX\ commands where
+% possible.\footnote{This applies to \LaTeX\ kernel commands only;
+% for example, \pkg{ifthenelse} is not used.}  For example,
+% \cs{newcommand*} is used in place of \cs{def}, unless custom
+% parameters are needed.  Hopefully, this will aid future
+% maintenance.  Grouping is used where possible to limit the scope of
+% temporary assignments.
+%
+%\subsection{Setup code}
+%\begin{macro}{\si@svn@version}
+%\begin{macro}{\si@svn@id}
+%\begin{macro}{\si@svn@ver}
+% As always, the package starts with identification.  This defines a
+% couple of macros for use with \emph{Subversion}, so that everything
+% is nice and clear.  This should also make it a bit easier to avoid
+% messing up the revision data!  For anyone reading the source, the
+% revision number is also available as well as the release version
+% number, of course.
+%    \begin{macrocode}
+\NeedsTeXFormat{LaTeX2e}
+\newcommand*{\si@svn@ver}{v1.0}
+\def\si@svn@id$#1: #2.#3 #4 #5-#6-#7 #8 #9${%
+  \newcommand*{\si@svn@version}{%
+    #5/#6/#7\space\si@svn@ver\space}}
+\si@svn@id $Id: siunitx.dtx 76 2008-06-15 08:10:34Z joseph $
+\ProvidesPackage{siunitx}
+  [\si@svn@version A comprehensive (SI) units package]
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+% The package requires \eTeX, so the usual test is made.
+%    \begin{macrocode}
+\begingroup
+  \@ifundefined{eTeXversion}
+    {\PackageError{siunitx}
+       {Not running under e-TeX}
+       {This package requires e-TeX. Try compiling the document
+        with\MessageBreak `elatex' instead of `latex'. When
+        using pdfTeX, try `pdfelatex'\MessageBreak instead of
+        `pdflatex'}%
+     \endgroup\endinput}
+    {\endgroup}
+%    \end{macrocode}
+%\begin{macro}{\si@catcodes}
+% There are circumstances under which some odd category codes might
+% be in place.  The category codes for |{|, |}|, |[|, |]| and |#| are
+% assumed to be okay; if issues arise, this can be altered.  \LaTeX\
+% will have set |@| as a letter on loading \currpkg.
+%    \begin{macrocode}
+\edef\si@catcodes{%
+  \catcode\string`\string ` \the\catcode\string`\`\relax
+  \catcode\string`\string = \the\catcode\string`\=\relax
+  \catcode\string`\string ^ \the\catcode\string`\^\relax
+  \catcode\string`\string ~ \the\catcode\string`\~\relax
+  \catcode\string`\string : \the\catcode\string`\:\relax
+  \catcode\string`\string - \the\catcode\string`\-\relax
+  \catcode\string`\string + \the\catcode\string`\+\relax
+  \catcode\string`\string ; \the\catcode\string`\;\relax
+  \catcode\string`\string , \the\catcode\string`\,\relax
+  \catcode\string`\string . \the\catcode\string`\.\relax}
+\catcode\string`\` 12\relax
+\catcode`\= 12\relax
+\catcode`\^ 7\relax
+\catcode`\~ \active\relax
+\@makeother{\:}
+\@makeother{\-}
+\@makeother{\+}
+\@makeother{\;}
+\@makeother{\,}
+\@makeother{\.}
+%    \end{macrocode}
+%\end{macro}
+% Packages needed for functionality are loaded.  \pkg{xkeyval}
+% handles the package options, while \pkg{amstext} from the \AMS\
+% bundle is needed for \cs{text}.  \pkg{array} is needed for the new
+% column type for tabular material.  \pkg{xspace} provides ``magic''
+% spacing after macros, if requested.
+%    \begin{macrocode}
+\RequirePackage{xkeyval}[2005/05/07]
+\RequirePackage{amstext,array,xspace}
+%    \end{macrocode}
+%\begin{macro}{\si@tempa}
+%\begin{macro}{\si@tempb}
+%\begin{macro}{\si@tempc}
+% Some scratch commands are defined; apart from where a known value
+% is carried through, these could contain anything.
+%    \begin{macrocode}
+\newcommand*{\si@tempa}{}
+\newcommand*{\si@tempb}{}
+\newcommand*{\si@tempc}{}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@switch}
+% Various items will need a switch.  To avoid name pollution, a
+% single switch is defined here; grouping will keep the definition
+% local.
+%    \begin{macrocode}
+\newif\ifsi@switch
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@tempboxa}
+%\begin{macro}{\si@tempboxb}
+%\begin{macro}{\si@tempboxc}
+%\begin{macro}{\si@tempboxd}
+% Some boxes are also needed.
+%    \begin{macrocode}
+\newbox\si@tempboxa
+\newbox\si@tempboxb
+\newbox\si@tempboxc
+\newbox\si@tempboxd
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@packagecheck}
+%\begin{macro}{\si@blockpkgs}
+%\begin{macro}{\si@checkpkgs}
+% As \currpkg is intended to replace the other unit-management
+% packages, these are tested for before any further processing.  If
+% any are loaded, the package halts compilation; name clashes or
+% unexpected results could occur if this is not tested.  Notice that
+% \SIunits and \SIstyle could be loaded with variable capitalisation
+% (at least on Windows); both possibilities are tested.
+%    \begin{macrocode}
+\newcommand*{\si@blockpkgs}{SIunits,sistyle,siunits,SIstyle,%
+  unitsdef,fancyunits}
+\newcommand*{\si@checkpkgs}{units,hepunits,fancynum}
+\newcommand*{\si@packagecheck}{%
+  \begingroup
+  \@for\si@tempa:=\si@blockpkgs\do{
+    \@ifpackageloaded{\si@tempa}
+      {\PackageError{siunitx}
+         {Package `\si@tempa' incompatible}
+         {The \si@tempa\space package and siunitx are
+          incompatible.\MessageBreak Use the
+          `emulate=\si@tempa' package option when loading
+          siunitx}}
+      {}}
+%    \end{macrocode}
+% Some packages should not cause a clash, but are emulated and would
+% be better handled that way.
+%    \begin{macrocode}
+  \@for\si@tempa:=\si@checkpkgs\do{%
+    \@ifpackageloaded{\si@tempa}
+      {\PackageWarning{siunitx}
+         {Consider loading the siunitx package
+          with\MessageBreak option `emulate=\si@tempa', rather
+          than\MessageBreak loading both \si@tempa\space and
+          siunitx}}
+      {}}
+  \endgroup}
+%    \end{macrocode}
+% The check is carried out on loading and at the beginning of the
+% document, so that packages loaded both before and after \currpkg
+% are caught.
+%    \begin{macrocode}
+\si@packagecheck
+\AtBeginDocument{\si@packagecheck}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@ifdefinable}
+% Using \cs{@ifdefinable} to check macro definitions gives a generic
+% error.  To give something more helpful, \cs{@ifundefined} is used,
+% but this needs some \cs{expandafter} work.  This way it can also be
+% used as a form of \cs{@ifundefined} for macro names.\\
+%\cs{si@ifdefinable}\marg{macro}
+%    \begin{macrocode}
+\newcommand*{\si@ifdefinable}[1]{%
+  \expandafter\expandafter\expandafter\@ifundefined%
+    \expandafter\expandafter\expandafter%
+      {\expandafter\@gobble\string#1}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@addtolist}
+% It is quite useful to be able to add to a comma-separated list
+% of expandable items.\\
+%\cs{si@addtolist}\marg{macro}\marg{items}
+%    \begin{macrocode}
+\newcommand*{\si@addtolist}[2]{%
+  \ifx\@empty#1\@empty
+    \edef#1{#2}%
+  \else
+    \edef#1{#1,#2}%
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@addtocsname}
+%\begin{macro}{\si@temptoks}
+% A second item to add to a command sequence.\\
+%\cs{si@addtocsname}\marg{csname}\marg{tokens}
+%    \begin{macrocode}
+\newtoks{\si@temptoks}
+\newcommand*{\si@addtocsname}[2]{%
+  \@ifundefined{#1}
+    {\expandafter\gdef\csname #1\endcsname{#2}}
+    {\si@temptoks\expandafter\expandafter\expandafter{%
+       \csname #1\endcsname#2}%
+     \expandafter\xdef\csname #1\endcsname{\the\si@temptoks}}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@ifmtarg}
+%\begin{macro}{\si@xifmtarg}
+%\begin{macro}{\si@ifnotmtarg}
+% To keep down dependance on other packages, the very short code
+% block from \pkg{ifmtarg} is copied here with an internal name.
+%    \begin{macrocode}
+\begingroup
+  \catcode`\Q=3
+  \long\gdef\si@ifmtarg#1{%
+    \si@xifmtarg#1QQ\@secondoftwo\@firstoftwo\@nil}
+  \long\gdef\si@xifmtarg#1#2Q#3#4#5\@nil{#4}
+  \long\gdef\si@ifnotmtarg#1{%
+    \si@xifmtarg#1QQ\@firstofone\@gobble\@nil}
+\endgroup
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@newrobustcmd}
+%\begin{macro}{\si@newcommand}
+%\begin{macro}{\si@newcmd}
+%\begin{macro}{\si@xargdef}
+% Some more copying, this time from \pkg{etoolbox}.  Various macros
+% need to be \emph{really} robust.  This is achieved using the \eTeX\
+% \cs{protected} primitive in various places.  However, it would be
+% nice to have a \cs{protected} version of \cs{newcommand}.
+% \pkg{etoolbox} has code for that, but to avoid needing to load it,
+% the necessary stuff is copied here.  The only changes form the
+% original are names, and the use of \cs{newcommand*} for the
+% \cs{si@newcommand} macro.\\
+%\cs{si@newcommand}\marg{macro}\\
+%\cs{si@newcmd}\marg{macro}\oarg{num-args}\\
+%\cs{si@xargdef}\marg{macro}\oarg{num-args}\oarg{default}\marg{def}
+%    \begin{macrocode}
+\@ifpackageloaded{etoolbox}
+  {\let\si@newrobustcmd\newrobustcmd}
+  {\protected\def\si@newrobustcmd{%
+     \@ifstar
+       {\let\l@ngrel@x\protected\si@newcommand}
+       {\def\l@ngrel@x{\protected\long}\si@newcommand}}
+   \newcommand*{\si@newcommand}[1]{\@testopt{\si@newcmd#1}0}
+   \def\si@newcmd#1[#2]{%
+     \@ifnextchar[%]
+       {\si@xargdef#1[#2]}
+       {\@argdef#1[#2]}}
+   \long\def\si@xargdef#1[#2][#3]#4{%
+     \@ifdefinable#1{%
+       \expandafter\protected
+       \expandafter\def
+       \expandafter#1%
+       \expandafter{%
+         \expandafter\@testopt
+         \csname\string#1\endcsname{#3}}%
+       \expandafter\@yargdef
+       \csname\string#1\endcsname\tw@{#2}{#4}}}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%
+%\subsection{Logging}
+%\begin{macro}{\ifsi@debug}
+%\begin{macro}{\ifsi@logmin}
+%\begin{macro}{\ifsi@lognone}
+% To control logging, some new switches are declared.
+%    \begin{macrocode}
+\newif\ifsi@debug
+\newif\ifsi@logmin
+\newif\ifsi@lognone
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@log@err}
+%\begin{macro}{\si@log@warn}
+%\begin{macro}{\si@log@inf}
+% Some handy re-usable macros are defined here.  These all take names
+% beginning  These pop up in various places.  First errors, warnings
+% and information are handled.  Package options are used to control
+% how much output is given.\\
+%\cs{si@log@err}\marg{error}\marg{explanation}\\
+%\cs{si@log@warn}\marg{warning}\\
+%\cs{si@log@inf}\marg{information}
+%    \begin{macrocode}
+\newcommand*{\si@log@err}[2]{%
+  \ifsi@lognone\else
+    \ifsi@logmin
+      \PackageWarning{siunitx}{#1}%
+    \else
+      \PackageError{siunitx}{#1}{#2}%
+    \fi
+  \fi}
+\newcommand*{\si@log@warn}[1]{%
+  \ifsi@lognone\else
+    \ifsi@logmin\else
+      \PackageWarning{siunitx}{#1}%
+    \fi
+  \fi}
+\newcommand*{\si@log@inf}[1]{%
+  \ifsi@lognone\else
+    \ifsi@logmin\else
+      \PackageInfo{siunitx}{#1}%
+    \fi
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@log@debug}
+% The debug macro only gives output if the appropriate package option
+% is set.\\
+%\cs{si@log@debug}\marg{debug-information}
+%    \begin{macrocode}
+\newcommand*{\si@log@debug}[1]{%
+  \ifsi@lognone\else
+    \ifsi@debug
+      \PackageInfo{siunitx}{#1}%
+    \fi
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%
+%\subsection{String comparison}
+%\begin{macro}{\si@str@ifchrstr}
+%\begin{macro}{\si@str@chrstr}
+% At various points, the package needs to compare two strings, to
+% find if one occurs in the other.  The first test is if a single
+% character is part of a second string; this is used, for example, to
+% check that a character is valid as input.  The first argument is
+% not expanded further, but the second is two allow division into
+% individual units.\\
+%\cs{si@str@ifchrstr}\marg{char}\marg{chars}\\
+%\cs{si@str@chrstr}\meta{char}\meta{chars}\cs{@empty}
+%    \begin{macrocode}
+\newcommand*{\si@str@ifchrstr}[2]{%
+  \begingroup
+    \si@switchfalse
+    \renewcommand*{\si@tempa}{#1}%
+    \protected@edef\si@tempb{#2}%
+    \expandafter\si@str@chrstr\si@tempb\@empty\@empty\@empty
+    \ifsi@switch
+      \aftergroup\@firstoftwo
+    \else
+      \aftergroup\@secondoftwo
+    \fi
+  \endgroup}
+\def\si@str@chrstr#1#2\@empty{%
+  \renewcommand*{\si@tempc}{#1}%
+  \ifx\si@tempa\si@tempc
+    \expandafter\si@switchtrue
+  \else
+    \ifx\@empty#2\@empty\else
+      \si@str@chrstr#2\@empty\@empty
+    \fi
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@str@ifonlychrs}
+%\begin{macro}{\si@str@onlychrs}
+% The second test builds on the first.  Here, a check is made to see
+% if the first string is made up only of characters from the second
+% string.  In this case, the first string is expanded before
+% testing.  The second string will be expanded by the internal
+% character by character test.\\
+%\cs{si@str@ifonlychars}\marg{string}\marg{valid-chars}\\
+%\cs{si@str@onlychars}\meta{char}\meta{chars}\cs{@empty}
+%    \begin{macrocode}
+\newcommand*{\si@str@ifonlychrs}[2]{%
+  \begingroup
+    \si@switchtrue
+    \protected@edef\si@tempa{#1}%
+    \renewcommand*{\si@tempb}{#2}%
+    \expandafter\si@str@onlychrs\si@tempa\@empty\@empty\@empty
+    \ifsi@switch
+      \aftergroup\@firstoftwo
+    \else
+      \aftergroup\@secondoftwo
+    \fi
+  \endgroup}
+\def\si@str@onlychrs#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@tempb}
+    {}{\si@switchfalse}%
+  \ifx\@empty#2\@empty\else
+    \si@str@onlychrs#2\@empty\@empty
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%
+%\subsection{Option handling}
+%\begin{macro}{\sisetup}
+% To allow modification of options at run time, a setup macro is
+% provided.
+%    \begin{macrocode}
+\newcommand*{\sisetup}{\setkeys[si]{key}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@opt@key}
+% To aid maintenance, some shortcuts are defined for generating keys.
+% These also allow the debugging messages to be added automatically
+% to every key.  First of all the basic key definition.\\
+%\cs{si@opt@key}\marg{keyname}\marg{code}
+%    \begin{macrocode}
+\newcommand*{\si@opt@key}[2]{%
+  \define@key[si]{key}{#1}
+  {#2\si@log@debug{Option #1 set to ##1}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@opt@cmdkey}
+%\begin{macro}{\si@opt@cmdkeys}
+% The command versions of the above.\\
+%\cs{si@opt@cmdkey}\oarg{default}\marg{keyname}\marg{function}\\
+%\cs{si@opt@cmdkeys}\oarg{default}\marg{keynames}
+%    \begin{macrocode}
+\newcommand*{\si@opt@cmdkey}[3][]{%
+  \define@cmdkey[si]{key}[si@]{#2}[#1]{#3}}
+\newcommand*{\si@opt@cmdkeys}[2][]{%
+  \define@cmdkeys[si]{key}[si@]{#2}[#1]}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@opt@boolkey}
+% Keys which only take switch values; anything other than \opt{true}
+% or \opt{false} will generate a warning from \pkg{xkeyval}.\\
+%\cs{si@opt@boolkey}\oarg{optional-processing}\marg{keyname}
+%    \begin{macrocode}
+\newcommand*{\si@opt@boolkey}[2][]{%
+  \define@boolkey[si]{key}[si@]{#2}[true]
+  {#1\si@log@debug{Option #2 set to ##1}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@opt@choicekey}
+% A ``fill in the blanks'' choice key.  In all cases, \cs{si@tempa}
+% is used to hold the value given to the key, so that \cs{ifx}
+% testing can occur.\\
+%\cs{si@opt@choicekey}\oarg{default}\marg{keyname}\marg{choices}^^A
+%\marg{in-list}
+%    \begin{macrocode}
+\newcommand*{\si@opt@choicekey}[4][]{%
+  \define@choicekey*+[si]{key}{#2}[\si@tempa]{#3}[#1]
+    {#4\si@log@debug{Option #2 set to ##1}}
+    {\si@log@warn{Unknown value `##1' for option #2}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@opt@xchoicekey}
+% Several of the package options can take either a choice from a list
+% of known options, or a value to be interpreted literally.  To aid
+% maintenance, the necessary code can be set up here.  These keys all
+% define a new macro, which must exist.  The \cs{si@opt@xchoicekey}
+% macro therefore ensures that this is defined, as well as setting up
+% the \pkg{xkeyval} key.\\
+%\cs{si@opt@xchoicekey}\marg{keyname}\marg{choices}\marg{initial}
+%    \begin{macrocode}
+\newcommand*{\si@opt@xchoicekey}[3]{%
+  \define@choicekey*+[si]{key}{#1}[\si@tempa]{#2}[#1]
+%    \end{macrocode}
+% This code will execute if the option is on the list.  There will be
+% a ``fixed'' macro with a matching name, which is used for this.
+%    \begin{macrocode}
+    {\si@log@debug{Option #1 set to ##1}%
+     \expandafter\renewcommand\expandafter*\expandafter{%
+      \csname si@#1\endcsname}{\@nameuse{si@fix@##1}}}
+%    \end{macrocode}
+% The user has given something that is not on the list as an
+% argument.  It is used literally.
+%    \begin{macrocode}
+    {\si@log@debug{Option #1 set to ##1}%
+     \expandafter\renewcommand\expandafter*\expandafter{%
+      \csname si@#1\endcsname}{##1}}
+%    \end{macrocode}
+% Finally, the initial value of the macro is set up.
+%    \begin{macrocode}
+  \expandafter\newcommand\expandafter*\expandafter{%
+    \csname si@#1\endcsname}%
+    {\@nameuse{si@fix@#3}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@opt@compatkey}
+% An all-in-one definition for a back-compatibility key.  These
+% should only be used at load time, so are automatically disabled
+% once the package is loaded.  Emulation is also automatically turned
+% on.\\
+%\cs{si@opt@compatkey}\marg{package}\marg{keyname}.
+%    \begin{macrocode}
+\newcommand*{\si@opt@compatkey}[2]{%
+  \define@boolkey[si]{key}[si@old@]{#2}[true]
+  {\si@log@debug{Emulating #1 package option\MessageBreak #2}%
+   \sisetup{emulate=#1}%
+   \si@log@debug{Option #2 set to ##1}}
+   \AtEndOfPackage{\si@opt@disablekey{#2}
+     {Compatibility option #2 only\MessageBreak
+        available when loading siunitx package}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@opt@disablekey}
+% The ability to disable a key with a meaningful message is a must;
+% the warning will come from \currpkg, and not from \pkg{xkeyval}\\
+%\cs{si@opt@disablekey}\marg{keyname}\marg{warning}
+%    \begin{macrocode}
+\newcommand*{\si@opt@disablekey}[2]{%
+  \key@ifundefined[si]{key}{#1}
+    {}
+    {\si@log@debug{Disabling key #1}%
+     \si@opt@key{#1}{\si@log@warn{#2}}}}
+%    \end{macrocode}
+%\end{macro}
+%
+% The \pkg{xkeyval} package option for logging is declared. This is
+% then processed to set the switches correctly.
+%    \begin{macrocode}
+\si@opt@choicekey[normal]{log}{debug,verbose,normal,errors,none}
+%    \end{macrocode}
+% A series of comparisons are made to assign the logging mode.  The
+% \opt{normal} option is not tested, as executing the option sets the
+% switches appropriately.
+%    \begin{macrocode}
+  {\si@debugfalse
+   \si@logminfalse
+   \si@lognonefalse
+   \renewcommand*{\si@tempb}{none}%
+   \ifx\si@tempa\si@tempb
+     \si@lognonetrue
+   \fi
+   \renewcommand*{\si@tempb}{minimal}%
+   \ifx\si@tempa\si@tempb
+     \si@logmintrue
+   \fi
+   \renewcommand*{\si@tempb}{debug}%
+   \ifx\si@tempa\si@tempb
+     \si@debugtrue
+   \fi
+   \renewcommand*{\si@tempb}{verbose}%
+   \ifx\si@tempa\si@tempb
+     \si@debugtrue
+   \fi}
+%    \end{macrocode}
+% A quick method to set \opt{log=debug}.
+%    \begin{macrocode}
+\si@opt@boolkey{debug}
+%    \end{macrocode}
+%\begin{macro}{\ifsi@strict}
+% It would be useful to be able to disable some keys, when strict
+% interpretation of the rules is desired.  This is a load-time
+% option, and has to disable various options.
+%    \begin{macrocode}
+\si@opt@boolkey[%
+  \ifsi@strict
+    \sisetup{
+      obeymode=false,
+      obeybold=false,
+      obeyitalic=false,
+      mode=maths,
+      repeatunits=true,
+      trapambigerr=true,
+      trapambigfrac=true}
+    \@for\si@tempa:=obeyall,obeymode,obeyitalic,mode,unitmode,%
+      valuemode,textmode,obeybold,repeatunits,trapambigerr,%
+      trapambigfrac\do{%
+      \begingroup
+        \edef\si@tempb{\endgroup
+          \noexpand\si@opt@disablekey{\si@tempa}
+          {Option `\si@tempa' forbidden in strict mode}}%
+      \si@tempb}
+  \fi]{strict}
+\AtEndOfPackage{
+  \si@opt@disablekey{strict}
+    {Option `strict' only available when\MessageBreak
+     loading package}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@emulate}
+% The \opt{emulate} option is used for back-compatibility mode; the
+% option is only valid when loading \currpkg.
+%    \begin{macrocode}
+\newcommand*{\si@emulate}{}
+\si@opt@key{emulate}{\si@addtolist{\si@emulate}{#1}}
+\AtEndOfPackage{
+  \si@opt@disablekey{emulate}
+    {Option `emulate' only available when\MessageBreak
+     loading package}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unitsep}
+%\begin{macro}{\si@unitspace}
+%\begin{macro}{\si@errspace}
+%\begin{macro}{\si@valuesep}
+% The two \opt{\dots sep} options control the size of spaces between
+% the number and the unit (\cs{si@valuesep}), and that used to
+% represent a product (\cs{si@unitsep}).  Known values here are
+% \opt{thin}, \opt{med}, \opt{medium}, \opt{thick}, \opt{cdot},
+% \opt{tightcdot}\footnote{Both \cs{cdot}-based options only valid
+% for \opt{unitsep}.} and \opt{none};\footnote{Only valid for
+% \opt{valuesep}.} other entries will be treated as custom spaces.
+%    \begin{macrocode}
+\si@opt@xchoicekey{unitsep}
+  {thin,med,medium,thick,none,comma,stop,fullstop,period,
+    times,tighttimes,cdot,tightcdot}{thin}
+\si@opt@xchoicekey{unitspace}{space,thin,med,medium,thick,
+  none}{thin}
+\si@opt@xchoicekey{errspace}{space,thin,med,medium,thick,
+  none}{none}
+\si@opt@xchoicekey{valuesep}
+  {thin,med,medium,thick,none,comma,stop,fullstop,period,
+    times,tighttimes,cdot,tightcdot}{thin}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@digitsep}
+% Separation of digits in large numbers is controlled by the
+% \opt{digitsep} option.  As with the other \opt{sep} values, this
+% one has a choice of possible values.  The list is quite long, so
+% that a range of options are handled automatically.  Notice that
+% \opt{digitsep=none} will be used for no separation at all.
+%    \begin{macrocode}
+\si@opt@xchoicekey{digitsep}
+  {thin,med,medium,thick,none,comma,stop,fullstop,period,
+    times,tighttimes,cdot,tightcdot}{thin}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@decimalsymbol}
+% The symbol used for the decimal position is varied here.  There are
+% only two real options, but options are given for the name of a full
+% stop.
+%    \begin{macrocode}
+\si@opt@xchoicekey{decimalsymbol}{comma,stop,fullstop,period,
+  cdot,tightcdot}{fullstop}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@anglesep}
+% The separator between degrees and minutes, and between minutes and
+% seconds, when using \cs{ang}.
+%    \begin{macrocode}
+\si@opt@xchoicekey{anglesep}
+    {thin,med,medium,thick,none,comma,stop,fullstop,period,
+      times,tighttimes,cdot,tightcdot}{none}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@obeymode}
+% The first test for the font control is whether to respect the
+% surrounding maths or text mode.
+%    \begin{macrocode}
+\si@opt@boolkey{obeymode}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@numtextmode}
+%\begin{macro}{\ifsi@unittextmode}
+% The output of the package can be typeset using either text or maths
+% mode fonts. Two switches are needed, for numbers and units.
+%    \begin{macrocode}
+\newif\ifsi@numtextmode
+\newif\ifsi@unittextmode
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+% The \opt{textmode} option has to set both flags.
+%    \begin{macrocode}
+\si@opt@choicekey[true]{textmode}{true,false}
+  {\si@numtextmodefalse
+   \si@unittextmodefalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@numtextmodetrue
+     \si@unittextmodetrue
+   \fi}
+%    \end{macrocode}
+% The \opt{mode} option applies to numbers and units.
+%    \begin{macrocode}
+\si@opt@choicekey{mode}{math,maths,text}
+  {\si@numtextmodefalse
+   \si@unittextmodefalse
+   \renewcommand*{\si@tempb}{text}%
+   \ifx\si@tempa\si@tempb
+     \si@numtextmodetrue
+     \si@unittextmodetrue
+   \fi}
+%    \end{macrocode}
+% Now the two options for numbers or units alone.
+%    \begin{macrocode}
+\si@opt@choicekey{valuemode}{math,maths,text}
+  {\si@numtextmodefalse
+   \renewcommand*{\si@tempb}{text}%
+   \ifx\si@tempa\si@tempb
+     \si@numtextmodetrue
+   \fi}
+\si@opt@choicekey{unitmode}{math,maths,text}
+  {\si@unittextmodefalse
+   \renewcommand*{\si@tempb}{text}%
+   \ifx\si@tempa\si@tempb
+     \si@unittextmodetrue
+   \fi}
+%    \end{macrocode}
+%\begin{macro}{\ifsi@obeyfamily}
+% The package can work to match the font family (serif, sans serif,
+% typewriter) of the surrounding text.  This is controlled by a
+% Boolean option.
+%    \begin{macrocode}
+\si@opt@boolkey{obeyfamily}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@obeybold}
+% The package can attempt to respect bold, or may ignore it.
+%    \begin{macrocode}
+\si@opt@boolkey{obeybold}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@inlinebtext}
+% For inline maths, two options for checking what is bold are
+% available, the maths environment (\ie \cs{boldmath}) and the
+% surrounding text (\cs{textbf} or \cs{bffamily}).
+%    \begin{macrocode}
+\newif\ifsi@inlinebtext
+\si@opt@choicekey{inlinebold}{text,maths,math}
+  {\si@inlinebtextfalse
+   \renewcommand*{\si@tempb}{text}%
+   \ifx\si@tempa\si@tempb
+     \si@inlinebtexttrue
+   \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@obeyitalic}
+% Italic is slightly different to bold, as there is no convenient
+% switch for maths.  Thus a choice key is used, with the appropriate
+% check.
+%    \begin{macrocode}
+\si@opt@boolkey{obeyitalic}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@detectdisplay}
+% For handling display mathematics, a setting is needed for whether to
+% treat it differently from other maths.
+%    \begin{macrocode}
+\si@opt@boolkey{detectdisplay}
+%    \end{macrocode}
+%\end{macro}
+% The option to obey all font switching commands is Boolean-like but
+% needs alternative setup.
+%    \begin{macrocode}
+\si@opt@choicekey[true]{obeyall}{true,false}
+  {\si@obeyboldfalse
+   \si@obeyitalicfalse
+   \si@obeymodefalse
+   \si@obeyfamilyfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@obeyboldtrue
+     \si@obeyitalictrue
+     \si@obeymodetrue
+     \si@obeyfamilytrue
+   \fi}
+%    \end{macrocode}
+%\begin{macro}{\si@valuemathsrm}
+%\begin{macro}{\si@valuemathssf}
+%\begin{macro}{\si@valuemathstt}
+%\begin{macro}{\si@unitmathsrm}
+%\begin{macro}{\si@unitmathssf}
+%\begin{macro}{\si@unitmathstt}
+% The fonts used by the package default to the obvious \LaTeX\ ones;
+% however, this needs to be exposed to user modification.  First the
+% maths mode fonts are sorted out.
+%    \begin{macrocode}
+\si@opt@cmdkeys{valuemathsrm,valuemathssf,valuemathstt}
+\si@opt@cmdkeys{unitmathsrm,unitmathssf,unitmathstt}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+% To make life easier for the user, US spellings are provided for the
+% maths keys.
+%    \begin{macrocode}
+\si@opt@key{valuemathrm}{\sisetup{valuemathsrm=#1}}
+\si@opt@key{valuemathsf}{\sisetup{valuemathssf=#1}}
+\si@opt@key{valuemathtt}{\sisetup{valuemathstt=#1}}
+\si@opt@key{unitmathrm}{\sisetup{unitmathsrm=#1}}
+\si@opt@key{unitmathsf}{\sisetup{unitmathssf=#1}}
+\si@opt@key{unitmathtt}{\sisetup{unitmathstt=#1}}
+%    \end{macrocode}
+% The combined options are given, for setting numbers and units
+% at the same time.
+%    \begin{macrocode}
+\si@opt@key{mathsrm}{\sisetup{valuemathsrm=#1,unitmathsrm=#1}}
+\si@opt@key{mathssf}{\sisetup{valuemathssf=#1,unitmathssf=#1}}
+\si@opt@key{mathstt}{\sisetup{valuemathstt=#1,unitmathstt=#1}}
+\si@opt@key{mathrm}{\sisetup{valuemathsrm=#1,unitmathsrm=#1}}
+\si@opt@key{mathsf}{\sisetup{valuemathssf=#1,unitmathssf=#1}}
+\si@opt@key{mathtt}{\sisetup{valuemathstt=#1,unitmathstt=#1}}
+%    \end{macrocode}
+%\begin{macro}{\si@valuetextrm}
+%\begin{macro}{\si@valuetextsf}
+%\begin{macro}{\si@valuetexttt}
+%\begin{macro}{\si@unittextrm}
+%\begin{macro}{\si@unittextsf}
+%\begin{macro}{\si@unittexttt}
+% The same thing for text mode fonts.  Once again the default values
+% are pretty obvious.
+%    \begin{macrocode}
+\si@opt@cmdkeys{valuetextrm,valuetextsf,valuetexttt}
+\si@opt@cmdkeys{unittextrm,unittextsf,unittexttt}
+\si@opt@key{textrm}{\sisetup{unittextrm=#1,valuetextrm=#1}}
+\si@opt@key{textsf}{\sisetup{unittextsf=#1,valuetextsf=#1}}
+\si@opt@key{texttt}{\sisetup{unittexttt=#1,valuetexttt=#1}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@numdigits}
+%\begin{macro}{\si@numdecimal}
+%\begin{macro}{\si@numexp}
+%\begin{macro}{\si@numprod}
+%\begin{macro}{\si@numgobble}
+%\begin{macro}{\si@numsign}
+%\begin{macro}{\si@numcloseerr}
+%\begin{macro}{\si@numopenerr}
+%\begin{macro}{\si@numaddn}
+% The list of possible valid characters for parsing numbers is set
+% up.  This is similar to \numprint, but with the \opt{extra} class,
+% and with characters ignored with no output renamed as \opt{gobble}.
+%    \begin{macrocode}
+\si@opt@cmdkeys{numdigits,numdecimal,numexp,numgobble,numsign,%
+  numcloseerr,numopenerr,numaddn,numprod}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@numvalid}
+%\begin{macro}{\si@numextra}
+% The various valid characters are collected together in a single
+% macro for later.  In common with the above macros, this one starts
+% \cs{si@num\ldots}.  The order here is the order the values are
+% tested later on.
+%    \begin{macrocode}
+\newcommand*{\si@numextra}{%
+  \si@numopenerr\si@numcloseerr\si@numaddn}
+\newcommand*{\si@numvalid}{\si@numgobble\si@numexp\si@numsign
+  \si@numdecimal\si@numdigits\si@numextra\si@numprod}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@seperr}
+%\begin{macro}{\ifsi@trapambigerr}
+%\begin{macro}{\si@openerr}
+%\begin{macro}{\si@closeerr}
+% An option to control whether numerical error values are printed with
+% or separate from the number.
+%    \begin{macrocode}
+\si@opt@boolkey{seperr}
+\si@opt@boolkey{trapambigerr}
+\si@opt@cmdkeys{openerr,closeerr}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@sepfour}
+% With four digits in a number, separating may or may not be desired.
+% Note that this option is the same as one for \numprint.
+%    \begin{macrocode}
+\si@opt@boolkey{sepfour}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@retainplus}
+% An option to keep an explicit positive sign.
+%    \begin{macrocode}
+\si@opt@boolkey{retainplus}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@expbase}
+%\begin{macro}{\si@expproduct}
+% The options for exponents are set up.
+%    \begin{macrocode}
+\si@opt@xchoicekey{expproduct}{times,tighttimes,
+  cdot,tightcdot}{times}
+\si@opt@xchoicekey{expbase}{ten}{ten}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@allowzeroexp}
+% The package normally prevents \num[allowzeroexp]{e0}.
+%    \begin{macrocode}
+\si@opt@boolkey{allowzeroexp}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@prefixproduct}
+% The marker for multiplication in prefixes.
+%    \begin{macrocode}
+\si@opt@xchoicekey{prefixproduct}{times,tighttimes,cdot,
+  tightcdot,none}{times}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@prefixbase}
+% In the same area, the power for prefixes is variable.  Here, two
+% choices ar needed.
+%    \begin{macrocode}
+\si@opt@xchoicekey{prefixbase}{ten,two}{ten}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@prefixsymbolic}
+% Unit prefixes can be given as either symbols or numerically.
+%    \begin{macrocode}
+\si@opt@boolkey{prefixsymbolic}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@num@padlead}
+%\begin{macro}{\ifsi@num@padtrail}
+% A setting is needed to indicate when to add zeros to decimal
+% numbers, either before the decimal marker (|.1| giving
+% ``\num[padnumber=all]{.1}'') or after (|1.| giving
+% ``\num[padnumber=all]{1.}'').
+%    \begin{macrocode}
+\newif\ifsi@num@padlead
+\newif\ifsi@num@padtrail
+\si@opt@choicekey[all]{padnumber}
+  {leading,lead,trailing,trail,all,both,true,none,false}
+  {\si@num@padleadfalse
+   \si@num@padtrailfalse
+   \renewcommand*{\si@tempb}{leading}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padleadtrue
+   \fi
+   \renewcommand*{\si@tempb}{lead}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padleadtrue
+   \fi
+   \renewcommand*{\si@tempb}{trailing}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padtrailtrue
+   \fi
+   \renewcommand*{\si@tempb}{trail}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padtrailtrue
+   \fi
+   \renewcommand*{\si@tempb}{all}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padleadtrue
+     \si@num@padtrailtrue
+   \fi
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padleadtrue
+     \si@num@padtrailtrue
+   \fi
+   \renewcommand*{\si@tempb}{both}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padleadtrue
+     \si@num@padtrailtrue
+   \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@sign}
+%\begin{macro}{\ifsi@num@signmant}
+%\begin{macro}{\ifsi@num@signexp}
+% Some new switches for adding signs to numbers
+%    \begin{macrocode}
+\newif\ifsi@num@signmant
+\newif\ifsi@num@signexp
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+% Signs can be added to numbers by default. Two options are needed
+% here; whether to add a sign by default, and what the sign is.
+%    \begin{macrocode}
+\si@opt@xchoicekey{sign}{plus,minus,pm,mp}{plus}
+\si@opt@choicekey[all]{addsign}
+  {mantissa,exponent,mant,exp,all,both,true,none,false}
+%    \end{macrocode}
+%\end{macro}
+% The option is now processed.
+%    \begin{macrocode}
+  {\si@num@signmantfalse
+   \si@num@signexpfalse
+   \renewcommand*{\si@tempb}{mantissa}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signmanttrue
+   \fi
+   \renewcommand*{\si@tempb}{mant}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signmanttrue
+   \fi
+   \renewcommand*{\si@tempb}{exponent}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signexptrue
+   \fi
+   \renewcommand*{\si@tempb}{exp}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signexptrue
+   \fi
+   \renewcommand*{\si@tempb}{all}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signmanttrue
+     \si@num@signexptrue
+   \fi
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signmanttrue
+     \si@num@signexptrue
+   \fi
+   \renewcommand*{\si@tempb}{both}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signmanttrue
+     \si@num@signexptrue
+   \fi}
+%    \end{macrocode}
+%\begin{macro}{\ifsi@tightpm}
+%\begin{macro}{\si@pm}
+% To reduce spacing, it might be necessary to use a ``tight'' $\pm$
+% sign.
+%    \begin{macrocode}
+\si@opt@boolkey{tightpm}
+\newcommand*{\si@pm}{%
+  \ifsi@tightpm
+    \si@fix@tightpm
+  \else
+    \si@fix@pm
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@ang@padsmall}
+%\begin{macro}{\ifsi@ang@padlarge}
+% A switch for determining whether to typeset |\ang{;;1}| as
+% \ang[padangle=both]{;;1} or \ang[padangle=none]{;;1}.  First, two
+% new Boolean switches are needed to indicate padding.
+%    \begin{macrocode}
+\newif\ifsi@ang@padsmall
+\newif\ifsi@ang@padlarge
+\si@opt@choicekey[all]{padangle}
+  {small,large,all,both,true,none,false}
+  {\si@ang@padsmallfalse
+   \si@ang@padlargefalse
+   \renewcommand*{\si@tempb}{small}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@padsmalltrue
+   \fi
+   \renewcommand*{\si@tempb}{large}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@padlargetrue
+   \fi
+   \renewcommand*{\si@tempb}{all}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@padsmalltrue
+     \si@ang@padlargetrue
+   \fi
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@padsmalltrue
+     \si@ang@padlargetrue
+   \fi
+   \renewcommand*{\si@tempb}{both}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@padsmalltrue
+     \si@ang@padlargetrue
+   \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@ang@toarc}
+%\begin{macro}{\ifsi@ang@todec}
+% To control whether angles are formatted as decimals or
+% degrees--minutes--seconds, a package option plus two switches are
+% needed.  The later format is referred to as ``\opt{arc}'' most
+% readily.  An option to leave the input unchanged is also provided.
+%    \begin{macrocode}
+\newif\ifsi@ang@toarc
+\newif\ifsi@ang@todec
+\si@opt@choicekey[all]{angformat}
+  {dec,decimal,arc,dms,unchanged,none}
+  {\si@ang@toarcfalse
+   \si@ang@todecfalse
+   \renewcommand*{\si@tempb}{dec}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@todectrue
+   \fi
+   \renewcommand*{\si@tempb}{decimal}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@todectrue
+   \fi
+   \renewcommand*{\si@tempb}{arc}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@toarctrue
+   \fi
+   \renewcommand*{\si@tempb}{dms}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@toarctrue
+   \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@astroang}
+% A slightly odd option to allow the method used by astronomers for
+% angles.
+%    \begin{macrocode}
+\si@opt@boolkey{astroang}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@strictarc}
+% For the \cs{ang} macro, the default is to require two semi-colons
+% in the input for arc angles.  This is controlled here.
+%    \begin{macrocode}
+\si@opt@boolkey{strictarc}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@tab@fixed}
+%\begin{macro}{\si@tabnumalign}
+%\begin{macro}{\si@tab@rfill@S}
+%\begin{macro}{\si@tab@lfill@S}
+% To determine the control of table alignment, two options are
+% provided.  The \opt{tabnumalign} option controls which centring method
+% is used, and the fills used for achieving this.
+%    \begin{macrocode}
+\newif\ifsi@tab@fixed
+\si@opt@choicekey{tabnumalign}
+  {centredecimal,centerdecimal,right,left,centre,center}
+  {\si@tab@fixedtrue
+   \let\si@tab@rfill@S\hfil
+   \let\si@tab@lfill@S\hfil
+   \renewcommand*{\si@tempb}{right}%
+   \ifx\si@tempa\si@tempb
+     \let\si@tab@lfill@S\hfill
+   \fi
+   \renewcommand*{\si@tempb}{left}%
+   \ifx\si@tempa\si@tempb
+     \let\si@tab@rfill@S\hfill
+   \fi
+   \renewcommand*{\si@tempb}{centredecimal}%
+   \ifx\si@tempa\si@tempb
+     \expandafter\si@tab@fixedfalse
+   \fi
+   \renewcommand*{\si@tempb}{centerdecimal}%
+   \ifx\si@tempa\si@tempb
+     \expandafter\si@tab@fixedfalse
+   \fi}
+\si@opt@key{tabalign}{\sisetup{tabnumalign=#1,tabtextalign=#1,
+  tabunitalign=#1}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@tabalignexp}
+% A switch for aligning exponents.
+%    \begin{macrocode}
+\si@opt@boolkey{tabalignexp}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@tab@mantprecnt}
+%\begin{macro}{\si@tab@mantpostcnt}
+%\begin{macro}{\si@tab@expprecnt}
+%\begin{macro}{\si@tab@exppostcnt}
+%\begin{macro}{\ifsi@tab@mantsign}
+%\begin{macro}{\ifsi@tab@expsign}
+% To process the format information, various internal
+% number-processing macros are used.  First, some
+% storage areas are created.
+%    \begin{macrocode}
+\newcount\si@tab@mantprecnt
+\newcount\si@tab@mantpostcnt
+\newcount\si@tab@expprecnt
+\newcount\si@tab@exppostcnt
+\newif\ifsi@tab@mantsign
+\newif\ifsi@tab@expsign
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+% The input is split into a mantissa and exponent, then passed to a
+% re-useable macro for further processing.
+%    \begin{macrocode}
+\si@opt@cmdkey{tabformat}
+  {\si@num@fixpm
+   \renewcommand*{\si@num@arg}{tabformat data}%
+   \renewcommand*{\si@num@exp}{}%
+   \renewcommand*{\si@num@mant}{}%
+   \si@tab@mantsignfalse
+   \si@tab@expsignfalse
+   \si@switchfalse
+   \si@num@sepmantexp{#1}%
+%    \end{macrocode}
+% When checking for a sign, the internal flag for finding but
+% deleting a plus sign is used.
+%    \begin{macrocode}
+   \si@num@sepsign{mant}%
+   \ifx\@empty\si@num@mantsign\@empty
+     \ifsi@num@delplus
+       \expandafter\expandafter\expandafter\si@tab@mantsigntrue
+     \fi
+   \else
+     \expandafter\si@tab@mantsigntrue
+   \fi
+   \si@num@sepsign{exp}%
+   \ifx\@empty\si@num@expsign\@empty
+     \ifsi@num@delplus
+       \expandafter\expandafter\expandafter\si@tab@expsigntrue
+     \fi
+   \else
+     \expandafter\si@tab@expsigntrue
+   \fi
+   \si@opt@proctform{mant}%
+   \si@opt@proctform{exp}%
+%    \end{macrocode}
+% The \opt{tabformat} input should really have both an integer and
+% decimal part for the mantissa.  If neither are present, an error is
+% raised. If just the one part is missing, an warning seems more
+% suitable.
+%    \begin{macrocode}
+   \ifnum\si@tab@mantpostcnt=\z@\relax
+     \ifnum\si@tab@mantprecnt=\z@\relax
+       \si@log@err{Empty mantissa argument for tabformat}
+         {The argument `#1' contains no valid entry for
+          a mantissa\MessageBreak It should be of the
+          form `m.n', where  m and n are integers}%
+     \else
+       \si@log@warn{Argument of tabformat contains\MessageBreak
+         no decimal part}%
+     \fi
+   \else
+     \ifnum\si@tab@mantprecnt=\z@\relax
+       \si@log@warn{Argument of tabformat contains\MessageBreak
+         no integer part}%
+     \fi
+   \fi
+%    \end{macrocode}
+% If \opt{tabformat} has been given with
+% \opt{tabnumalign=centredecimal} active, then the alignment is
+% changed to centred.
+%    \begin{macrocode}
+   \ifsi@tab@fixed\else
+     \sisetup{tabnumalign=centre}%
+   \fi
+   \let\pm\si@num@pm
+   \let\mp\si@num@mp}
+%    \end{macrocode}
+%\begin{macro}{\si@opt@proctform}
+% Processing the number further uses the \cs{si@num@digits} macro.
+% The results are stored in the appropriate counter.\\
+%\cs{si@opt@proctform}\marg{mant/exp}
+%    \begin{macrocode}
+\newcommand*{\si@opt@proctform}[1]{%
+  \renewcommand*{\si@num@predec}{}%
+  \renewcommand*{\si@num@postdec}{}%
+  \si@switchfalse
+  \expandafter\si@ifnotmtarg\expandafter{%
+    \csname si@num@#1\endcsname}
+     {\expandafter\expandafter\expandafter\si@num@digits
+        \csname si@num@#1\endcsname\@empty\@empty}%
+   \csname si@tab@#1precnt\endcsname\z@\relax
+   \csname si@tab@#1postcnt\endcsname\z@\relax
+   \ifx\@empty\si@num@predec\@empty\else
+     \csname si@tab@#1precnt\endcsname\si@num@predec\relax
+   \fi
+   \ifx\@empty\si@num@postdec\@empty\else
+     \csname si@tab@#1postcnt\endcsname\si@num@postdec\relax
+   \fi}
+%    \end{macrocode}
+%\end{macro}
+% The alignment of tabular material when not processed by \cs{num}
+% needs to be available.
+%    \begin{macrocode}
+\si@opt@choicekey{tabtextalign}{left,right,centre,center}
+%    \end{macrocode}
+%\begin{macro}{\si@tab@rfill@t}
+%\begin{macro}{\si@tab@lfill@t}
+% By default, centring happens on both sides of the content of
+% tabular material.
+%    \begin{macrocode}
+  {\let\si@tab@rfill@t\hfill
+   \let\si@tab@lfill@t\hfill
+   \renewcommand*{\si@tempb}{right}%
+   \ifx\si@tempa\si@tempb
+     \let\si@tab@rfill@t\relax
+   \fi
+   \renewcommand*{\si@tempb}{left}%
+   \ifx\si@tempa\si@tempb
+     \let\si@tab@lfill@t\relax
+   \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+% The alignment of unit columns for tabular material has a similar
+% control option.
+%    \begin{macrocode}
+\si@opt@choicekey{tabunitalign}{left,right,centre,center}
+%    \end{macrocode}
+%\begin{macro}{\si@tab@rfill@s}
+%\begin{macro}{\si@tab@lfill@s}
+% By default, centring happens on both sides of the content of
+% tabular material.
+%    \begin{macrocode}
+  {\let\si@tab@rfill@s\hfill
+   \let\si@tab@lfill@s\hfill
+   \renewcommand*{\si@tempb}{right}%
+   \ifx\si@tempa\si@tempb
+     \let\si@tab@rfill@s\relax
+   \fi
+   \renewcommand*{\si@tempb}{left}%
+   \ifx\si@tempa\si@tempb
+     \let\si@tab@lfill@s\relax
+   \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@fixdp}
+%\begin{macro}{\si@num@dp}
+% To allow control of rounding, two options are needed.  One sets how
+% many fixed digits to use, the second turns this function on and
+% off.
+%    \begin{macrocode}
+\si@opt@boolkey{fixdp}
+\newcount\si@num@dp
+\si@opt@key{dp}{%
+  \si@str@ifonlychrs{#1}{0123456789}
+    {}
+    {\si@log@err{Invalid input for dp option}
+      {The dp option must be given a positive integer}}%
+  \si@num@dp#1\relax
+  \si@fixdptrue}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@tabautofit}
+% To apply rounding automatically in a table, a separate option is
+% used.
+%    \begin{macrocode}
+\si@opt@boolkey{tabautofit}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@xspace}
+% Unit macros on their own may need \pkg{xpsace}.
+%    \begin{macrocode}
+\si@opt@boolkey{xspace}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@prespace}
+%    \begin{macrocode}
+\si@opt@boolkey
+  [\si@unt@numfalse
+   \ifsi@prespace
+     \si@unt@numtrue
+  \fi]
+  {prespace}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@allowoptarg}
+% For \unitsdef users, a method to absorb optional arguments is
+% needed.
+%    \begin{macrocode}
+\si@opt@boolkey{allowoptarg}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@frac}
+%\begin{macro}{\ifsi@slash}
+%\begin{macro}{\ifsi@stickyper}
+% The option processing for formatting units with \cs{per} in them
+% needs two switches.
+%    \begin{macrocode}
+\newif\ifsi@slash
+\newif\ifsi@frac
+\si@opt@boolkey{stickyper}
+\si@opt@choicekey[reciprocal]{per}
+  {reciprocal,rp,power,slash,frac,fraction}
+  {\si@slashfalse
+   \si@fracfalse
+   \renewcommand*{\si@tempb}{slash}%
+   \ifx\si@tempa\si@tempb
+     \si@fractrue
+     \si@slashtrue
+     \let\si@frac\si@frc@slash
+   \fi
+   \renewcommand*{\si@tempb}{frac}%
+   \ifx\si@tempa\si@tempb
+     \si@fractrue
+   \fi
+   \renewcommand*{\si@tempb}{fraction}%
+   \ifx\si@tempa\si@tempb
+     \si@fractrue
+   \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@slash}
+% For the \opt{slash} option, the separator can be customised.
+%    \begin{macrocode}
+\si@opt@xchoicekey{slash}{slash}{slash}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@repeatunits}
+%\begin{macro}{\ifsi@addunitpower}
+% An option is needed for cases where units should be repeated.
+%    \begin{macrocode}
+\newif\ifsi@repeatunits
+\newif\ifsi@addunitpower
+\si@opt@choicekey[true]{repeatunits}{true,false,power}
+  {\si@repeatunitsfalse
+   \si@addunitpowerfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@repeatunitstrue
+   \fi
+   \renewcommand*{\si@tempb}{power}%
+   \ifx\si@tempa\si@tempb
+     \si@addunitpowertrue
+   \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@trapambigfrac}
+%\begin{macro}{\si@closefrac}
+%\begin{macro}{\si@openfrac}
+% Macros for the right and left brackets added to potentially
+% ambiguous denominators.
+%    \begin{macrocode}
+\si@opt@boolkey{trapambigfrac}
+\si@opt@cmdkeys{closefrac,openfrac}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+% In the case of fractional handling of the \cs{per} operator,
+% further refinement is available.
+%    \begin{macrocode}
+\si@opt@choicekey[frac]{fraction}
+  {frac,nicefrac,nice,sfrac,xfrac,uglyfrac,ugly}
+  {\let\si@frac\si@frc@frac
+   \renewcommand*{\si@tempb}{nicefrac}%
+   \ifx\si@tempa\si@tempb
+     \let\si@frac\si@frc@nice
+   \fi
+   \renewcommand*{\si@tempb}{uglyfrac}%
+   \ifx\si@tempa\si@tempb
+     \let\si@frac\si@frc@ugly
+   \fi
+   \renewcommand*{\si@tempb}{nice}%
+   \ifx\si@tempa\si@tempb
+     \let\si@frac\si@frc@nice
+   \fi
+   \renewcommand*{\si@tempb}{sfrac}%
+   \ifx\si@tempa\si@tempb
+     \let\si@frac\si@frc@sfrac
+   \fi
+   \renewcommand*{\si@tempb}{xfrac}%
+   \ifx\si@tempa\si@tempb
+     \let\si@frac\si@frc@sfrac
+   \fi
+   \renewcommand*{\si@tempb}{ugly}%
+   \ifx\si@tempa\si@tempb
+     \let\si@frac\si@frc@ugly
+   \fi}
+%    \end{macrocode}
+%\begin{macro}{\si@load}
+%\begin{macro}{\si@noload}
+% Loading of support files is controlled by two keys.  The first
+% defines a list of files that may be loaded, the second a list that
+% will not.  This makes it easy to exclude a single file from a long
+% list.
+%    \begin{macrocode}
+\si@opt@cmdkeys{load,noload}
+\si@opt@key{alsoload}{\si@addtolist{\si@load}{#1}}
+\AtEndOfPackage{
+  \si@opt@disablekey{load}
+    {Configuration files can only be used\MessageBreak
+     when loading package}
+  \si@opt@disablekey{noload}
+    {Configuration files can only be used\MessageBreak
+     when loading package}}
+\AtEndOfPackage{
+  \si@opt@key{alsoload}{%
+    \@for\si@tempa:=#1\do{\si@loadfile{\si@tempa}}}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@colourunits}
+%\begin{macro}{\ifsi@colourvalues}
+%\begin{macro}{\si@unitcolour}
+%\begin{macro}{\si@valuecolour}
+% Colour is turned on and off using two switches and the appropriate
+% options.  US spellings are also provided.
+%    \begin{macrocode}
+\si@opt@boolkey{colourunits}
+\si@opt@boolkey{colourvalues}
+\si@opt@choicekey[true]{colorunits}
+  {true,false}
+  {\si@colourunitsfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@colourunitstrue
+   \fi}
+\si@opt@choicekey[true]{colorvalues}
+  {true,false}
+  {\si@colourvaluesfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@colourvaluestrue
+   \fi}
+\si@opt@choicekey[true]{colorall}
+  {true,false}
+  {\si@colourvaluesfalse
+   \si@colourunitsfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@colourunitstrue
+     \si@colourvaluestrue
+   \fi}
+\si@opt@choicekey[true]{colourall}
+  {true,false}
+  {\si@colourvaluesfalse
+   \si@colourunitsfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@colourunitstrue
+     \si@colourvaluestrue
+   \fi}
+\si@opt@cmdkeys{unitcolour,valuecolour}
+\si@opt@key{unitcolor}{\sisetup{unitcolour=#1}}
+\si@opt@key{valuecolor}{\sisetup{valuecolour=#1}}
+\si@opt@key{colour}{\sisetup{unitcolour=#1,valuecolour=#1}}
+\si@opt@key{color}{\sisetup{unitcolour=#1,valuecolour=#1}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@colourneg}
+%\begin{macro}{\si@negcolour}
+% The set up for colouring negative numbers is similar.
+%    \begin{macrocode}
+\si@opt@boolkey{colourneg}
+\si@opt@choicekey[true]{colorneg}
+  {true,false}
+  {\si@colournegfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@colournegtrue
+   \fi}
+\si@opt@cmdkeys{negcolour}
+\si@opt@key{negcolor}{\sisetup{negcolour=#1}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@textOmega}
+%\begin{macro}{\si@mathsOmega}
+% The various non-Latin symbols need to be handled, and given user interfaces.
+% Some definitions are more complex than others; for \si{\ohm}
+% things are easy.
+%    \begin{macrocode}
+\si@opt@cmdkeys{textOmega,mathsOmega}
+\si@opt@key{mathOmega}{\sisetup{mathsOmega=#1}}
+\newcommand*{\si@mathsOmega}{\text{\ensuremath{\Omega}}}
+\newcommand*{\si@textOmega}{\ensuremath{\Omega}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@textmu}
+%\begin{macro}{\si@mathsmu}
+% For the \si{\micro} symbol, some direct loading of symbols is
+% needed as the maths mu sign ($\mu$) is wrong.
+%    \begin{macrocode}
+\si@opt@cmdkeys{textmu,mathsmu}
+\si@opt@key{mathmu}{\sisetup{mathsmu=#1}}
+\DeclareFontEncoding{TS1}{}{}
+\DeclareFontSubstitution{TS1}{cmr}{m}{n}
+\DeclareTextSymbol{\si@textmu}{TS1}{181}
+\DeclareTextSymbolDefault{\si@textmu}{TS1}
+\DeclareFontFamily{OML}{eur}{\skewchar\font127}
+\DeclareFontShape{OML}{eur}{m}{n}%
+  {<5> <6> <7> <8> <9> gen * eurm %
+    <10><10.95><12><14.4><17.28><20.74><24.88>eurm10}{}
+\DeclareSymbolFont{greek}{OML}{eur}{m}{n}
+\DeclareMathSymbol{\si@mathsmu}{\mathord}{greek}{"16}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@textdegree}
+%\begin{macro}{\si@mathsdegree}
+%\begin{macro}{\si@textminute}
+%\begin{macro}{\si@mathsminute}
+%\begin{macro}{\si@textsecond}
+%\begin{macro}{\si@mathssecond}
+% The angle signs.
+%    \begin{macrocode}
+\si@opt@cmdkeys{textdegree,mathsdegree,textminute,mathsminute,
+  textsecond,mathssecond}
+\si@opt@key{mathdegree}{\sisetup{mathsdegree=#1}}
+\si@opt@key{mathminute}{\sisetup{mathsminute=#1}}
+\si@opt@key{mathsecond}{\sisetup{mathssecond=#1}}
+\newcommand*{\si@textdegree}{\ensuremath{{}^{\circ}}}
+\newcommand*{\si@mathsdegree}{{}^{\circ}}
+\newcommand*{\si@textminute}{\ensuremath{{}^{\prime}}}
+\newcommand*{\si@mathsminute}{{}^{\prime}}
+\newcommand*{\si@textsecond}{\ensuremath{{}^{\prime\prime}}}
+\newcommand*{\si@mathssecond}{{}^{\prime\prime}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@textcelsius}
+%\begin{macro}{\si@mathscelsius}
+% Finally, degrees Celsius, which may need the degree symbol.
+%    \begin{macrocode}
+\si@opt@cmdkeys{textcelsius,mathscelsius}
+\si@opt@key{mathcelsius}{\sisetup{mathscelsius=#1}}
+\newcommand*{\si@textcelsius}{%
+  \si@textdegree\kern-\scriptspace C}
+\newcommand*{\si@mathscelsius}{%
+  \si@mathsdegree\kern-\scriptspace\mathrm{C}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@textringA}
+%\begin{macro}{\si@mathsringA}
+% The \si{\angstrom} sign.
+%    \begin{macrocode}
+\si@opt@cmdkeys{textringA,mathsringA}
+\si@opt@key{mathringA}{\sisetup{mathsringA=#1}}
+\newcommand*{\si@textringA}{\AA}
+\newcommand*{\si@mathsringA}{\text{\AA}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@redefsymbols}
+% A flag for using \pkg{textcomp} and \pkg{upgreek} to provide better
+% symbols.
+%    \begin{macrocode}
+\si@opt@boolkey{redefsymbols}
+\AtBeginDocument{
+  \si@opt@disablekey{redefsymbols}
+    {Symbols can only be redefined\MessageBreak
+     when loading siunitx}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@eVcorra}
+%\begin{macro}{\si@eVcorrb}
+%    \begin{macrocode}
+\newlength\si@eVcorra
+\newlength\si@eVcorrb
+\si@opt@key{eVcorra}{\setlength\si@eVcorra{#1}}
+\si@opt@key{eVcorrb}{\setlength\si@eVcorrb{#1}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@locale}
+%\begin{macro}{\si@loctolang}
+% Handling typographic conventions needs three keys.  \opt{locale} is
+% used to set the locale, \opt{loctolang} to bind to \pkg{babel}.
+%    \begin{macrocode}
+\si@opt@key{locale}{%
+  \si@loc@load{#1}%
+  \si@loc@set{#1}}%
+\si@opt@key{loctolang}{\si@loc@ltol{#1}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%
+%\subsection{Compatibility options}
+%\begin{macro}{\ifsi@old@ugly}
+%\begin{macro}{\ifsi@old@nice}
+%\begin{macro}{\ifsi@old@loose}
+%\begin{macro}{\ifsi@old@tight}
+% With the options for the package set up, the next stage is to
+% provide support for users of the older packages.  These all set up
+% switches, but do not do anything.  That is left to the emulation
+% files, loaded at the end of the package. First of all, the
+% \units options are dealt with; there are not many.
+%    \begin{macrocode}
+\si@opt@compatkey{units}{ugly}
+\si@opt@compatkey{units}{nice}
+\si@opt@compatkey{units}{loose}
+\si@opt@compatkey{units}{tight}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@old@OHM}
+%\begin{macro}{\ifsi@old@ohm}
+%\begin{macro}{\ifsi@old@redef-gensymb}
+%\begin{macro}{\ifsi@gensymb}
+% The \unitsdef package is unfortunately much more profligate with
+% options. The first set are to do with support for \pkg{gensymb}.
+%    \begin{macrocode}
+\si@opt@compatkey{unitsdef}{OHM}
+\si@opt@compatkey{unitsdef}{ohm}
+\si@opt@compatkey{unitsdef}{redef-gensymb}
+\newif\ifsi@gensymb
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@old@LITER}
+%\begin{macro}{\ifsi@old@liter}
+%\begin{macro}{\ifsi@old@noxspace}
+%\begin{macro}{\ifsi@old@noconfig}
+% The second set are more general functionality.
+%    \begin{macrocode}
+\si@opt@compatkey{unitsdef}{LITER}
+\si@opt@compatkey{unitsdef}{liter}
+\si@opt@compatkey{unitsdef}{noxspace}
+\si@opt@compatkey{unitsdef}{noconfig}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@old@noabbr}
+%\begin{macro}{\ifsi@old@noamperageabbr}
+%\begin{macro}{\ifsi@old@nofrequncyabbr}
+%\begin{macro}{\ifsi@old@nomolabbr}
+%\begin{macro}{\ifsi@old@novoltageabbr}
+%\begin{macro}{\ifsi@old@novolumeabbr}
+%\begin{macro}{\ifsi@old@noweightabbr}
+%\begin{macro}{\ifsi@old@noenergyabbr}
+%\begin{macro}{\ifsi@old@nolengthabbr}
+%\begin{macro}{\ifsi@old@notimeabbr}
+% The final set are for control of abbreviations, and are a good
+% demonstration of why to use \pkg{xkeyval}!
+%    \begin{macrocode}
+\si@opt@compatkey{unitsdef}{noabbr}
+\si@opt@compatkey{unitsdef}{noampereageabbr}
+\si@opt@compatkey{unitsdef}{nofrequncyabbr}
+\si@opt@compatkey{unitsdef}{nomolabbr}
+\si@opt@compatkey{unitsdef}{novoltageabbr}
+\si@opt@compatkey{unitsdef}{novolumeabbr}
+\si@opt@compatkey{unitsdef}{noweightabbr}
+\si@opt@compatkey{unitsdef}{noenergyabbr}
+\si@opt@compatkey{unitsdef}{nolengthabbr}
+\si@opt@compatkey{unitsdef}{notimeabbr}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@old@cdot}
+%\begin{macro}{\ifsi@old@thickspace}
+%\begin{macro}{\ifsi@old@mediumspace}
+%\begin{macro}{\ifsi@old@thinspace}
+%\begin{macro}{\ifsi@old@thickqspace}
+%\begin{macro}{\ifsi@old@mediumqspace}
+%\begin{macro}{\ifsi@old@thinqspace}
+% The \SIunits package has lots of options.  These ones are all
+% related to spacing.
+%    \begin{macrocode}
+\si@opt@compatkey{SIunits}{cdot}
+\si@opt@compatkey{SIunits}{thickspace}
+\si@opt@compatkey{SIunits}{mediumspace}
+\si@opt@compatkey{SIunits}{thinspace}
+\si@opt@compatkey{SIunits}{thickqspace}
+\si@opt@compatkey{SIunits}{mediumqspace}
+\si@opt@compatkey{SIunits}{thinqspace}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@old@amssymb}
+%\begin{macro}{\ifsi@old@squaren}
+%\begin{macro}{\ifsi@old@pstricks}
+%\begin{macro}{\ifsi@old@Gray}
+%\begin{macro}{\ifsi@old@italian}
+% These options are used by \SIunits to control clashes with other
+% packages.
+%    \begin{macrocode}
+\si@opt@compatkey{SIunits}{amssymb}
+\si@opt@compatkey{SIunits}{squaren}
+\si@opt@compatkey{SIunits}{pstricks}
+\si@opt@compatkey{SIunits}{Gray}
+\si@opt@compatkey{SIunits}{italian}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@old@textstyle}
+%\begin{macro}{\ifsi@old@binary}
+%\begin{macro}{\ifsi@old@noams}
+%\begin{macro}{\ifsi@old@derivedinbase}
+%\begin{macro}{\ifsi@old@derived}
+% The miscellaneous options.
+%    \begin{macrocode}
+\si@opt@compatkey{SIunits}{textstyle}
+\si@opt@compatkey{SIunits}{binary}
+\si@opt@compatkey{SIunits}{noams}
+\si@opt@compatkey{SIunits}{derivedinbase}
+\si@opt@compatkey{SIunits}{derived}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@old@noprefixcmds}
+% The \pkg{hepunits} package only has one option.
+%    \begin{macrocode}
+\si@opt@compatkey{hepunits}{noprefixcmds}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@old@english}
+%\begin{macro}{\ifsi@old@french}
+% \pkg{fancynum} provides a few options.  First the rather oddly
+% named \opt{english} and \opt{french} ones.
+%    \begin{macrocode}
+\si@opt@compatkey{fancynum}{english}
+\si@opt@compatkey{fancynum}{french}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@old@tight}
+%\begin{macro}{\ifsi@old@loose}
+% A couple for spacing multiplication.
+%    \begin{macrocode}
+\si@opt@compatkey{fancynum}{tight}
+\si@opt@compatkey{fancynum}{loose}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@old@thinspaces}
+%\begin{macro}{\ifsi@old@commas}
+%\begin{macro}{\ifsi@old@plain}
+% Three for digit separation.
+%    \begin{macrocode}
+\si@opt@compatkey{fancynum}{thinspaces}
+\si@opt@compatkey{fancynum}{commas}
+\si@opt@compatkey{fancynum}{plain}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@old@spaceqspace}
+% The \pkg{fancyunits} package provides one option not available with
+% \SIunits.
+%    \begin{macrocode}
+\si@opt@compatkey{fancyunits}{spaceqspace}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Constants}
+% A number of macros are needed by the package that provide a
+% non-changing output.  These are defined here; the intention is that
+% these should not be macros that the user is likely to need to
+% alter.  All of these macros have preface \cs{si@fix@}, to flag that
+% that are intended as constants.  The package may rely on the
+% contents of these macros for functionality.
+%
+%\begin{macro}{\si@fix@thin}
+%\begin{macro}{\si@fix@med}
+%\begin{macro}{\si@fix@medium}
+%\begin{macro}{\si@fix@thick}
+%\begin{macro}{\si@fix@space}
+% First, there are the various space macros.  To allow both \opt{med}
+% and \opt{medium} to be used as a space description, two macros are
+% needed for the same output.
+%    \begin{macrocode}
+\newcommand*{\si@fix@thin}{\,}
+\newcommand*{\si@fix@med}{\:}
+\newcommand*{\si@fix@medium}{\:}
+\newcommand*{\si@fix@thick}{\;}
+\newcommand*{\si@fix@space}{\text{~}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@fix@cdot}
+%\begin{macro}{\si@fix@comma}
+%\begin{macro}{\si@fix@stop}
+%\begin{macro}{\si@fix@fullstop}
+%\begin{macro}{\si@fix@period}
+%\begin{macro}{\si@fix@times}
+%\begin{macro}{\si@fix@tighttimes}
+%\begin{macro}{\si@fix@tightcdot}
+% Next there are macros for material that is not simply whitespace.
+% To allow several options, the full-stop gets lots of names.
+%    \begin{macrocode}
+\newcommand*{\si@fix@cdot}{{}\cdot{}}
+\newcommand*{\si@fix@comma}{{,}}
+\newcommand*{\si@fix@stop}{{.}}
+\newcommand*{\si@fix@fullstop}{{.}}
+\newcommand*{\si@fix@period}{{.}}
+\newcommand*{\si@fix@times}{\times}
+\newcommand*{\si@fix@tighttimes}{\bgroup\times\egroup}
+\newcommand*{\si@fix@tightcdot}{\bgroup\cdot\egroup}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@fix@plus}
+%\begin{macro}{\si@fix@minus}
+%\begin{macro}{\si@fix@pm}
+%\begin{macro}{\si@fix@tightpm}
+%\begin{macro}{\si@fix@mp}
+% Signs for numbers are needed.
+%    \begin{macrocode}
+\newcommand*{\si@fix@plus}{+}
+\newcommand*{\si@fix@minus}{-}
+\newcommand*{\si@fix@pm}{\pm}
+\newcommand*{\si@fix@tightpm}{\bgroup\pm\egroup}
+\newcommand*{\si@fix@mp}{\mp}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@fix@two}
+%\begin{macro}{\si@fix@ten}
+% The literals ``2'' and ``10'' are needed for exponents.
+%    \begin{macrocode}
+\newcommand*{\si@fix@two}{2}
+\newcommand*{\si@fix@ten}{10}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@fix@slash}
+% Another optional component that will probably not be used by many
+% people.
+%    \begin{macrocode}
+\newcommand*{\si@fix@slash}{/}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@fix@none}
+% Finally for spacing, there is the possibility of nothing at all
+%    \begin{macrocode}
+\newcommand*{\si@fix@none}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Symbols}
+%\begin{macro}{\si@symbol}
+% Each of the symbol macros needs to be set up; the options give a
+% maths and text mode sign, but internally a single macro is needed
+% for each.
+%    \begin{macrocode}
+\newcommand*{\si@symbol}[1]{%
+  \expandafter\protected\expandafter\def
+    \csname si@sym@#1\endcsname{%
+    \ifmmode
+      \expandafter\csname si@maths#1\expandafter\endcsname
+    \else
+      \expandafter\csname si@text#1\expandafter\endcsname
+    \fi}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@sym@Omega}
+%\begin{macro}{\si@sym@ringA}
+%\begin{macro}{\si@sym@mu}
+%\begin{macro}{\si@sym@degree}
+%\begin{macro}{\si@sym@minute}
+%\begin{macro}{\si@sym@second}
+%\begin{macro}{\si@sym@celsius}
+% The various symbols are now declared.
+%    \begin{macrocode}
+\si@symbol{Omega}
+\si@symbol{ringA}
+\si@symbol{mu}
+\si@symbol{degree}
+\si@symbol{minute}
+\si@symbol{second}
+\si@symbol{celsius}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+% The issue of redefinition of symbols now arises.  \currpkg can
+% check for the loading of a number of support package, and can then
+% redefine the appropriate symbols.
+%    \begin{macrocode}
+\AtBeginDocument{%
+  \ifsi@redefsymbols
+    \@ifpackageloaded{textcomp}
+      {\si@log@debug{Redefining symbols using textcomp}%
+       \renewcommand*{\si@textdegree}{\textdegree}%
+       \renewcommand*{\si@mathsdegree}{\text{\textdegree}}%
+%    \end{macrocode}
+% \pkg{mathptmx} will give issues with \pkg{textcomp} and the
+% \si{\ohm} sign.
+%    \begin{macrocode}
+       \@ifpackageloaded{mathptmx}{}
+         {\renewcommand*{\si@textmu}{\textmu}%
+          \renewcommand*{\si@textOmega}{\textohm}}%
+%    \end{macrocode}
+% The \si{\angstrom} symbol is only redefined if the encoding is
+% OT1; other encodings should have a proper glyph used for \cs{AA}.
+% The \cs{encodingdefault} macro is \cs{long} for some reason.
+%    \begin{macrocode}
+       \renewcommand*{\si@tempa}{OT1}%
+       \ifx\si@tempa\encodingdefault
+         \renewcommand*{\si@mathsringA}{%
+           \text{\capitalring{A}}}%
+         \renewcommand*{\si@textringA}{\capitalring{A}}
+       \fi}{}
+    \@ifpackageloaded{upgreek}
+      {\si@log@debug{Redefining symbols using upgreek}%
+       \renewcommand*{\si@mathsmu}{\upmu}%
+       \renewcommand*{\si@mathsOmega}{\Upomega}}{}
+  \fi}
+%    \end{macrocode}
+%
+%\subsection{Handling fractions}
+%\begin{macro}{\si@frac}
+%\begin{macro}{\si@frc@hook}
+%\begin{macro}{\si@frc@frac}
+%\begin{macro}{\si@frc@slash}
+%\begin{macro}{\si@frc@nice}
+%\begin{macro}{\si@frc@sfrac}
+% Various methods of handling fractions are provided.
+%    \begin{macrocode}
+\newcommand*{\si@frc@frac}[2]{%
+  \ensuremath{\si@frc@hook\frac{%
+    \expandafter\si@unt@out\expandafter{#1}}%
+    {\expandafter\si@unt@out\expandafter{#2}}}}
+\let\si@frac\si@frc@frac
+\newcommand*{\si@frc@hook}{}
+\newcommand*{\si@frc@slash}[2]{%
+    \expandafter\si@unt@out\expandafter{#1}%
+    \si@out{\ensuremath{\si@slash}}%
+    \expandafter\si@unt@out\expandafter{#2}}
+\newcommand*{\si@frc@nice}[2]{%
+  \ensuremath{\si@frc@nicefrac{\expandafter\si@unt@out%
+    \expandafter{#1}}{\expandafter\si@unt@out\expandafter
+      {#2}}}}
+\newcommand*{\si@frc@sfrac}[2]{%
+    \sfrac{\expandafter\si@unt@out\expandafter{#1}}%
+      {\expandafter\si@unt@out\expandafter{#2}}}
+\AtBeginDocument{
+  \@ifpackageloaded{xfrac}
+    {}
+    {\si@log@inf{xfrac package unavailable\MessageBreak
+       using `fraction=sfrac' will fall back on\MessageBreak
+       nicefrac-like method}%
+     \renewcommand*{\si@frc@sfrac}[2]{%
+      \si@log@warn{xfrac package unavailable}%
+      \si@frc@nice{#1}{#2}}}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@frc@nicefrac}
+%\begin{macro}{\si@frc@displen}
+%\begin{macro}{\si@frc@textlen}
+%\begin{macro}{\si@frc@suplen}
+%\begin{macro}{\si@frc@ssuplen}
+% To avoid needing \units installed, the \cs{nicefrac} macro needs
+% to be emulated here. The code is taken (with permission) from
+% \kg{nicefrac}.\footnote{The original is licensed under the GPL;
+% thanks to the author Axel Reichert for permission to copy the code
+% here.}
+%    \begin{macrocode}
+\newlength\si@frc@displen
+\newlength\si@frc@textlen
+\newlength\si@frc@suplen
+\newlength\si@frc@ssuplen
+\newcommand*{\si@frc@nicefrac}{%
+  \ifmmode
+    \expandafter\si@frc@mathsnf
+  \else
+    \expandafter\si@frc@textnf
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@frc@mathsnf}
+% The maths mode system.\\
+%\cs{si@frc@mathsnf}\marg{numerator}\marg{denominator}
+%    \begin{macrocode}
+\newcommand*{\si@frc@mathsnf}[2]{%
+  \begingroup
+    \settoheight{\si@frc@displen}{\ensuremath{%
+      \displaystyle{M}}}%
+    \settoheight{\si@frc@textlen}{\ensuremath{%
+      \textstyle{M}}}%
+    \settoheight{\si@frc@suplen}{\ensuremath{%
+      \scriptstyle{M}}}%
+    \settoheight{\si@frc@ssuplen}{%
+      \ensuremath{\scriptscriptstyle{M}}}%
+    \addtolength{\si@frc@displen}{-\si@frc@ssuplen}%
+    \addtolength{\si@frc@textlen}{-\si@frc@ssuplen}%
+    \addtolength{\si@frc@suplen}{-\si@frc@ssuplen}%
+    \mathchoice
+      {\raisebox{\si@frc@displen}{\ensuremath{%
+        \scriptstyle{#1}}}}%
+      {\raisebox{\si@frc@textlen}{\ensuremath{%
+         \scriptstyle{#1}}}}%
+      {\raisebox{\si@frc@suplen}%
+        {\ensuremath{\scriptscriptstyle{#1}}}}%
+      {\raisebox{\si@frc@ssuplen}%
+        {\ensuremath{\scriptscriptstyle{#1}}}}%
+    \mkern-2mu\relax/\mkern-1mu\relax
+    \bgroup
+      \mathchoice
+        {\scriptstyle}%
+        {\scriptstyle}%
+        {\scriptscriptstyle}%
+        {\scriptscriptstyle}%
+      {#2}%
+    \egroup
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@frc@textnf}
+% A stripped down version of the \pkg{nicefrac} system for text mode.\\
+%\cs{si@frc@textnf}\marg{numerator}\marg{denominator}
+%    \begin{macrocode}
+\newcommand*{\si@frc@textnf}[2]{%
+  \begingroup
+    \settoheight{\si@frc@textlen}{M}%
+    \settoheight{\si@frc@ssuplen}{\fontsize\sf@size\z@\relax
+      \selectfont{M}}%
+    \addtolength{\si@frc@textlen}{-\si@frc@ssuplen}%
+    \raisebox{\si@frc@textlen}{\fontsize\sf@size\z@\relax
+      \selectfont{#1}}%
+    \hspace{-0.25ex}/\hspace{-0.25ex}%
+    \hbox{\fontsize\sf@size\z@\selectfont{#2}}%
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@frc@ugly}
+% The \cs{si@frc@ugly} macro is needed to emulate the \opt{ugly}
+% option in \units, where output depends on the current mode.\\
+%\cs{si@frc@ugly}\marg{numerator}
+%    \begin{macrocode}
+\newcommand*{\si@frc@ugly}[1]{%
+  \renewcommand*{\si@tempa}{#1}%
+  \ifmmode
+    \expandafter\si@frc@frac
+  \else
+    \renewcommand*{\si@tempb}{1}%
+    \ifx\si@tempa\si@tempb
+%    \end{macrocode}
+% The slash switch cannot be used, so the possibility of the
+% numerator being one is handled here.
+%    \begin{macrocode}
+      \setbox\si@tempboxa=\hbox{\ensuremath{\si@valuesep}}%
+      \hskip-\wd\si@tempboxa\relax
+      \renewcommand*{\si@tempa}{}%
+    \fi
+    \expandafter\si@frc@slash
+  \fi
+  {\si@tempa}}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Font control}
+% A number of controls and tests are needed to control the font used
+% for output.  Underlying all of this is the \AMS\ package
+% \pkg{amstext} package, providing the \cs{text} command.  Much of
+% the font control system here is taken more or less verbatim from
+% \SIstyle; modifications have been made to fit the \currpkg
+% interface.
+%
+%\begin{macro}{\si@fam@sf}
+%\begin{macro}{\si@fam@tt}
+% The package needs to know the maths font families in use.  This is
+% set right at the start of the document, after any changes can have
+% been made by, for example, \pkg{fontspec}.
+%    \begin{macrocode}
+\g@addto@macro{\document}{%
+  \ifdefined\mathsf
+    \setbox\si@tempboxa=\hbox{%
+      $\mathsf{\global\chardef\si@fam@sf=\fam}$}%
+  \else
+    \si@log@inf{\string\mathsf not found}%
+    \global\chardef\si@fam@sf=99\relax
+  \fi
+  \ifdefined\mathtt
+    \setbox\si@tempboxa=\hbox{%
+      $\mathtt{\global\chardef\si@fam@tt=\fam}$}%
+  \else
+    \si@log@inf{\string\mathtt not found}%
+    \global\chardef\si@fam@tt=99\relax
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@fam@ifbtext}
+%\begin{macro}{\si@fam@ifbmaths}
+% These tests check for bold in text and maths mode, respectively.\\
+%\cs{si@fam@ifbtext}\marg{code}\\
+%\cs{si@fam@ifbmaths}\marg{code}
+%    \begin{macrocode}
+\newcommand*{\si@fam@ifbtext}[1]{%
+  \if b\expandafter\@car\f@series\@nil
+    #1\fi}
+\newcommand*{\si@fam@ifbmaths}[1]{%
+  \renewcommand*{\si@tempa}{bold}%
+  \ifx\math@version\si@tempa
+    #1\fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@fam@ifbinline}
+% For compatibility with \units, a method to change the behaviour
+% when in inline maths is needed for the bold detector.
+%    \begin{macrocode}
+\newcommand*{\si@fam@ifbinline}{%
+  \ifsi@inlinebtext
+    \expandafter\si@fam@ifbtext
+  \else
+    \expandafter\si@fam@ifbmaths
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@fam@ifitext}
+% This test check for italic or slanted text in text mode, by
+% negation (upright text is |n|).\\
+%\cs{si@fam@ifitext}\marg{code}
+%    \begin{macrocode}
+\newcommand*{\si@fam@ifitext}[1]{%
+  \if n\expandafter\@car\f@series\@nil\else
+    #1\fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@fam@mode}
+% Detection of the current mode needs to happen``early'' (before any
+% change of \cs{ensuremath}).  So a short macro is provided to do the
+% job.
+%    \begin{macrocode}
+\newcommand*{\si@fam@mode}{%
+  \ifsi@obeymode
+    \ifmmode
+      \sisetup{mode=maths}%
+    \else
+      \sisetup{mode=text}%
+    \fi
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@fam@colourcmd}
+% The colour command is set up.
+%    \begin{macrocode}
+\AtBeginDocument{
+  \@ifpackageloaded{color}
+    {\let\si@fam@colourcmd\color}
+    {\let\si@fam@colourcmd\@gobble}}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\ifsi@fam@set}
+%\begin{macro}{\ifsi@textmode}
+% A marker is set up to check if font-matching has been taken place.
+% A second flag is used to track the use of text mode.
+%    \begin{macrocode}
+\newif\ifsi@fam@set
+\newif\ifsi@textmode
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@fam@set}
+% Using the code from \SIstyle as a base, a set of tests are used to
+% set the current font families and weights.  To begin with, the
+% mode to use is set up.
+%    \begin{macrocode}
+\newcommand*{\si@fam@set}{%
+  \ifsi@out@num
+    \ifsi@numtextmode
+      \expandafter\expandafter\expandafter\si@textmodetrue
+    \else
+      \expandafter\expandafter\expandafter\si@textmodefalse
+    \fi
+  \else
+    \ifsi@unittextmode
+      \expandafter\expandafter\expandafter\si@textmodetrue
+    \else
+      \expandafter\expandafter\expandafter\si@textmodefalse
+    \fi
+  \fi
+%    \end{macrocode}
+%\begin{macro}{\si@mathsrm}
+%\begin{macro}{\si@mathssf}
+%\begin{macro}{\si@mathstt}
+%\begin{macro}{\si@textrm}
+%\begin{macro}{\si@textsf}
+%\begin{macro}{\si@texttt}
+%\begin{macro}{\si@colourcmd}
+%\begin{macro}{\si@colour}
+% The appropriate font macros are now established, if necessary.
+%    \begin{macrocode}
+  \ifsi@fam@set\else
+    \let\si@colourcmd\@gobble
+    \ifsi@out@num
+      \let\si@mathsrm\si@valuemathsrm
+      \let\si@mathssf\si@valuemathssf
+      \let\si@mathstt\si@valuemathstt
+      \let\si@textrm\si@valuetextrm
+      \let\si@textsf\si@valuetextsf
+      \let\si@texttt\si@valuetexttt
+      \ifsi@colourvalues
+        \let\si@colourcmd\si@fam@colourcmd
+      \fi
+      \let\si@colour\si@valuecolour
+    \else
+      \let\si@mathsrm\si@unitmathsrm
+      \let\si@mathssf\si@unitmathssf
+      \let\si@mathstt\si@unitmathstt
+      \let\si@textrm\si@unittextrm
+      \let\si@textsf\si@unittextsf
+      \let\si@texttt\si@unittexttt
+      \ifsi@colourunits
+        \let\si@colourcmd\si@fam@colourcmd
+      \fi
+      \let\si@colour\si@unitcolour
+    \fi
+  \fi
+  \si@fam@settrue
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+% The temporary macros are needed for the \cs{ifx} tests, which need to
+% be expanded once.
+%    \begin{macrocode}
+  \edef\si@tempa{\sfdefault}%
+  \edef\si@tempb{\ttdefault}%
+%    \end{macrocode}
+%\begin{macro}{\si@fam@maths}
+%\begin{macro}{\si@fam@text}
+% The surrounding font family is only tested if matching is
+% requested.  First, the defaults are set up assuming no detection
+% takes place.
+%    \begin{macrocode}
+  \expandafter\let\expandafter\si@fam@maths
+    \csname\si@mathsrm\endcsname
+  \expandafter\let\expandafter\si@fam@text
+    \csname\si@textrm\endcsname
+  \ifsi@obeyfamily
+    \si@log@debug{Font detection: checking font}%
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+% The detection code has to check the mode currently in operation.
+% Display mathematics can be handled in two ways, so this means some
+% code is repeated: it is spun out to separate routines.
+%    \begin{macrocode}
+    \ifmmode
+      \ifinner
+        \si@log@debug{Font detection: inline maths}%
+        \si@fam@dettext
+      \else
+        \si@log@debug{Font detection: display maths}%
+        \ifsi@detectdisplay
+          \si@fam@detmaths
+        \else
+          \si@fam@dettext
+        \fi
+      \fi
+    \else
+      \si@log@debug{Font detection: text}%
+      \si@fam@dettext
+    \fi
+  \else
+    \si@log@debug{Font detection: inactive}%
+  \fi
+%    \end{macrocode}
+%\begin{macro}{\si@fam@bold}
+% With the font family set, the next check is for bold text.  This
+% again needs to examine the current mode. Things are a bit more
+% complex than in \SIstyle as it is possible to be typesetting in
+% either text or maths mode.  The bold command is set up with
+% \cs{def}, as nested calls can occur.
+%    \begin{macrocode}
+  \def\si@fam@bold{\unboldmath\mdseries}%
+  \ifsi@obeybold
+    \si@log@debug{Weight detection: checking weight}%
+    \ifmmode
+      \ifdim\displaywidth>0pt\relax
+        \ifsi@detectdisplay
+          \expandafter\si@fam@ifbmaths
+        \else
+          \expandafter\si@fam@ifbtext
+        \fi
+        \si@fam@setbold
+      \else
+        \si@fam@ifbinline\si@fam@setbold
+      \fi
+    \else
+      \si@fam@ifbtext\si@fam@setbold
+    \fi
+  \fi
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@fam@italic}
+% The value of \opt{obeyitalic} is now tested; as this does nothing
+% in maths mode, a reminder is added to the log.
+%    \begin{macrocode}
+  \let\si@fam@italic\upshape
+  \ifsi@obeyitalic
+    \si@log@debug{Italic detection: checking italic}%
+    \si@fam@ifitext
+      {\let\si@fam@italic\relax
+       \si@log@debug{Italic detection: italic}}%
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@fam@detmaths}
+%\begin{macro}{\si@fam@dettext}
+% Two detection macros are needed for maths and text mode. This
+% allows handling of the various combinations without needing too
+% many code lines.
+%    \begin{macrocode}
+\newcommand*{\si@fam@detmaths}{%
+  \ifnum\the\fam=\si@fam@sf
+    \si@log@debug{Font detection: sf}%
+    \expandafter\let\expandafter\si@fam@maths
+      \csname\si@mathssf\endcsname
+    \expandafter\let\expandafter\si@fam@text
+      \csname\si@textsf\endcsname
+  \else
+    \ifnum\the\fam=\si@fam@tt
+      \si@log@debug{Font detection: tt}%
+      \expandafter\let\expandafter\si@fam@maths
+        \csname\si@mathstt\endcsname
+      \expandafter\let\expandafter\si@fam@text
+        \csname\si@texttt\endcsname
+    \else
+      \si@log@debug{Font detection: rm}%
+      \expandafter\let\expandafter\si@fam@maths
+        \csname\si@mathsrm\endcsname
+      \expandafter\let\expandafter\si@fam@text
+        \csname\si@textrm\endcsname
+    \fi
+  \fi}
+\newcommand*{\si@fam@dettext}{%
+  \ifx\f@family\si@tempa
+    \si@log@debug{Font detection: sf}%
+    \expandafter\let\expandafter\si@fam@maths
+      \csname\si@mathssf\endcsname
+    \expandafter\let\expandafter\si@fam@text
+      \csname\si@textsf\endcsname
+  \else
+    \ifx\f@family\si@tempb
+      \si@log@debug{Font detection: tt}%
+      \expandafter\let\expandafter\si@fam@maths
+        \csname\si@mathstt\endcsname
+      \expandafter\let\expandafter\si@fam@text
+        \csname\si@texttt\endcsname
+    \else
+      \si@log@debug{Font detection: rm}%
+      \expandafter\let\expandafter\si@fam@maths
+        \csname\si@mathsrm\endcsname
+      \expandafter\let\expandafter\si@fam@text
+        \csname\si@textrm\endcsname
+    \fi
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@fam@setbold}
+%\begin{macro}{\si@fam@boldify}
+% For setting bold, a couple of control macros are needed.
+%    \begin{macrocode}
+\newcommand*{\si@fam@setbold}{%
+  \si@log@debug{Weight detection: bold weight}%
+  \let\si@fam@bold\si@fam@boldify}
+\newcommand*{\si@fam@boldify}{\boldmath\bfseries}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%
+%\subsection{Formatting numbers}
+%\begin{macro}{\num}
+% The system used here is modelled on that in \numprint; the
+% input is broken down into single tokens, each one is examined and
+% the result is re-assembled into an output number.  However, various
+% changes have been made to the system used, and so the macros here
+% are not simply renamed copies of those in \numprint.  The user
+% macro \cs{num} sets any local keys, then calls the number
+% formatting macro on the processed number.\\
+%\cs{num}\oarg{options}\marg{num}
+%    \begin{macrocode}
+\si@newrobustcmd*{\num}[2][]{%
+  \begingroup
+    \sisetup{#1}%
+    \si@fam@mode
+    \si@num@intabfalse
+    \si@log@debug{Processing \string\num\space input `#2'}%
+    \expandafter\si@out@num\expandafter{\si@num{#2}}%
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@num@intab}
+% A flag for processing inside a table is needed.
+%    \begin{macrocode}
+\newif\ifsi@num@intab
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num}
+% This is the main processing macro.  Unlike the related macro in
+% \numprint, the output of this macro is not subjected to any font
+% changes.  That is left to one of the \cs{si@out@\ldots} macros.  No
+% grouping is applied here; any call to \cs{si@num} (or any of the
+% sub-macros) must be within a group as the definitions used rely on
+% this.  Grouping is not applied here so that other macros can get
+% the various separated parts of the input.\\
+%\cs{si@num}\marg{num}
+%    \begin{macrocode}
+\newcommand*{\si@num}[1]{%
+%    \end{macrocode}
+% The argument of the macro is fully expanded before any processing.
+% By using \cs{scantokens}, any odd problems from packages with
+% active characters can be avoided.
+%    \begin{macrocode}
+  \si@num@fixpm
+  \begingroup
+    \makeatletter
+    \@makeother{\,}%
+    \@makeother{\.}%
+    \@makeother{\+}%
+    \@makeother{\-}%
+    \def~{}%
+    \def\,{}%
+    \catcode`\~=\active\relax
+    \catcode`\^=\active\relax
+    \everyeof{\noexpand}%
+    \endlinechar\m@ne
+    \protected@xdef\si@tempa{\scantokens{#1}}%
+  \endgroup
+%    \end{macrocode}
+% Processing only takes place if there is actually something in the
+% argument.  This is tested once ``hard'' spaces have been stripped
+% out; if there is input other than spaces, the processor first
+% checks the validity of the input, then moves on to format it.
+%    \begin{macrocode}
+  \si@ifnotmtarg{\si@tempa}
+    {\si@num@ifvalid{\si@tempa}
+      {\si@num@format{\si@tempa}}
+%    \end{macrocode}
+% The parser has to bailed-out, and so no further processing of
+% the input is done.  Instead, whatever was passed to the macro is
+% returned as supplied.
+%    \begin{macrocode}
+      {\si@log@err{Invalid character `#1' in numerical input}%
+         {Only characters from the list
+          `\si@numvalid'\MessageBreak should be present in the
+          argument of the \string\num\space  macro\MessageBreak
+         (or derivative such as an `s' column)}%
+       {#1}}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@fixpm}
+%\begin{macro}{\si@num@pm}
+%\begin{macro}{\si@num@mp}
+%\begin{macro}{\pm}
+%\begin{macro}{\mp}
+% With certain packages loaded, there can be issues with \cs{pm} and
+% \cs{mp}.  To avoid this, the \eTeX\ \cs{protected} system is
+% employed; this is only used within local groups.
+%    \begin{macrocode}
+\newcommand*{\si@num@fixpm}{%
+  \let\si@num@pm\pm
+  \let\si@num@mp\mp
+  \protected\def\pm{\si@num@pm}%
+  \protected\def\mp{\si@num@mp}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@ifvalid}
+%\begin{macro}{\si@num@valid}
+% Assuming that there is a non-space argument to \cs{si@num}, every
+% character is checked to ensure it is valid in the context, so that
+% further processing can occur without sanity checks.  If the
+% character is valid, recursion occurs.\\
+%\cs{si@num@ifvalid}\marg{chars}\\
+%\cs{si@num@valid}\meta{char}\meta{chars}\cs{@empty}
+%    \begin{macrocode}
+\newcommand*{\si@num@ifvalid}[1]{%
+  \begingroup
+    \si@switchtrue
+    \expandafter\si@num@valid#1\@empty\@empty
+    \ifsi@switch
+      \aftergroup\@firstoftwo
+    \else
+      \aftergroup\@secondoftwo
+    \fi
+  \endgroup}
+\def\si@num@valid#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@numvalid}
+    {\ifx\@empty#2\@empty\else
+       \si@num@valid#2\@empty\@empty\@empty
+     \fi}
+    {\si@switchfalse}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@in}
+%\begin{macro}{\si@num@out}
+%\begin{macro}{\si@num@exp}
+%\begin{macro}{\si@num@expsign}
+%\begin{macro}{\si@num@mant}
+%\begin{macro}{\si@num@mantsign}
+%\begin{macro}{\si@num@err}
+%\begin{macro}{\si@num@xpart}
+%\begin{macro}{\si@num@ambig}
+%\begin{macro}{\si@tab@out}
+%\begin{macro}{\si@tab@expout}
+% Various storage macros are needed.
+%    \begin{macrocode}
+\newcommand*{\si@num@in}{}
+\newcommand*{\si@num@out}{}
+\newcommand*{\si@num@exp}{}
+\newcommand*{\si@num@expsign}{}
+\newcommand*{\si@num@mant}{}
+\newcommand*{\si@num@mantsign}{}
+\newcommand*{\si@num@err}{}
+\newcommand*{\si@num@xpart}{}
+\newcommand*{\si@num@ambig}{}
+\newcommand*{\si@tab@out}{}
+\newcommand*{\si@tab@expout}{}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@num@erropen}
+% A flag is set up for tracking unclosed errors.
+%    \begin{macrocode}
+\newif\ifsi@num@erropen
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@format}
+%\begin{macro}{\si@num@arg}
+% The number processor starts by saving |#1| (odd things happen
+% otherwise).  A hook is also provided to allow modifications by
+% other macros.\\
+%\cs{si@num@format}\marg{num}
+%    \begin{macrocode}
+\newcommand*{\si@num@arg}{}
+\newcommand*{\si@num@format}[1]{%
+  \protected@edef\si@num@arg{#1}%
+  \si@log@debug{Formatting number `\si@num@arg'}%
+%    \end{macrocode}
+%\end{macro}
+% The storage areas are emptied.
+%    \begin{macrocode}
+  \renewcommand*{\si@num@in}{}%
+  \renewcommand*{\si@num@exp}{}%
+  \renewcommand*{\si@num@expsign}{}%
+  \renewcommand*{\si@num@mant}{}%
+  \renewcommand*{\si@num@mantsign}{}%
+  \renewcommand*{\si@num@err}{}%
+  \renewcommand*{\si@num@xpart}{}%
+%    \end{macrocode}
+% Any ``x-part'' is now found, leaving the first number in
+% \cs{si@num@in} and anything else in \cs{si@num@xpart}.
+%    \begin{macrocode}
+  \si@switchfalse
+  \expandafter\si@num@findxpart\si@num@arg\@empty\@empty
+%    \end{macrocode}
+% The input is split into an mantissa and an exponent; the flag is
+% used here to indicate if an exponent is found.  The mantissa will
+% end up in \cs{si@num@mant}, and the exponent in \cs{si@num@exp}.
+%    \begin{macrocode}
+  \si@switchfalse
+  \si@num@sepmantexp{\si@num@in}%
+%    \end{macrocode}
+% The sign and value of the mantissa and exponent are separated; the
+% mantissa is done after the exponent as this makes life easier when
+% using the table-formatting fork. Checks are then needed, as a sign
+% with no value is potentially-valid for the mantissa (for example
+% \num{-e10}).
+%    \begin{macrocode}
+  \si@num@sepsign{exp}%
+  \si@num@sepsign{mant}%
+  \ifx\@empty\si@num@exp\@empty
+    \ifx\@empty\si@num@expsign\@empty\else
+      \si@log@warn{Sign but no number for `\si@num@arg'}%
+    \fi
+    \let\si@num@expsign\@empty
+  \fi
+  \ifx\@empty\si@num@mant\@empty
+    \ifx\@empty\si@num@mantsign\@empty\else
+      \ifx\@empty\si@num@exp\@empty
+        \si@log@warn{Sign but no number for `\si@num@arg'}%
+        \let\si@num@mantsign\@empty
+      \fi
+    \fi
+  \fi
+%    \end{macrocode}
+% A check for negative mantissa values is made, to allow some
+% colour-based trickery.
+%    \begin{macrocode}
+  \renewcommand*{\si@tempa}{{-}}%
+  \ifx\si@num@mantsign\si@tempa
+    \ifsi@colourneg
+      \expandafter\expandafter\expandafter\si@fam@colourcmd
+    \else
+      \expandafter\expandafter\expandafter\@gobble
+    \fi
+  \else
+    \expandafter\@gobble
+  \fi
+  {\si@negcolour}%
+%    \end{macrocode}
+% The next stage is to process the remaining data, to find the
+% decimal marker and reformat correctly.  These two macros control
+% this entire process.  The exponent is processed first as this makes
+% life easier when the system is used to typeset tabular
+% material.\footnote{The contents of \cs{si@num@predec} and
+% \cs{si@num@postdec} are needed for the mantissa.}
+%    \begin{macrocode}
+  \si@num@procnum{exp}%
+  \si@num@procnum{mant}%
+%    \end{macrocode}
+% If the exponent is zero, then if might need to be deleted.
+%    \begin{macrocode}
+  \si@str@ifonlychrs{\si@num@exp}{0\si@numdecimal}
+    {\ifsi@allowzeroexp\else
+       \renewcommand*{\si@num@exp}{}%
+       \ifx\@empty\si@num@mant\@empty
+         \renewcommand*{\si@num@mant}{1}%
+       \fi
+     \fi}{}%
+%    \end{macrocode}
+% To build up the number for typesetting, a rather complex series
+% of tests is needed.  First, the ``ambiguous error'' flag is
+% set if there is an exponent and the package has been asked to check
+% this.  The same flag will already be true if a unit is present and
+% checking is active.
+%    \begin{macrocode}
+  \ifx\@empty\si@num@exp\@empty\else
+    \ifsi@trapambigerr
+      \expandafter\expandafter\expandafter\si@num@ambigerrtrue
+    \fi
+  \fi
+%    \end{macrocode}
+%\begin{macro}{\si@num@out}
+%\begin{macro}{\si@tab@out}
+%\begin{macro}{\si@tab@expout}
+% Processing now divides, as when used with the |S| column some extra
+% steps are needed.  Inside a table, the macro \cs{si@tab@out} holds
+% the part of the mantissa before the decimal sign.  The post-decimal
+% part then ends up in \cs{i@num@out}.  On the other hand, under
+% normal circumstances the entire mantissa should be copied to
+% \cs{si@num@out}.
+%    \begin{macrocode}
+  \protected@edef\si@num@out{%
+    \ensuremath{{\si@num@mantsign}}\si@num@mant}%
+  \renewcommand*{\si@tempa}{num}%
+  \ifsi@num@intab
+    \protected@edef\si@tab@out{%
+      \ensuremath{{\si@num@mantsign}}\si@num@predec}%
+    \protected@edef\si@num@out{\si@num@postdec}%
+    \renewcommand*{\si@tempa}{tab}%
+  \fi
+%    \end{macrocode}
+% Now there is the error part to handle.  For tables, a check has to
+% be made so the error ends up in the correct part of the number. The
+% value of \cs{si@tempa} is used to track this., and so is set up
+% here.
+%    \begin{macrocode}
+  \ifx\@empty\si@num@postdec\@empty\else
+    \renewcommand*{\si@tempa}{num}%
+  \fi
+  \ifx\@empty\si@num@err\@empty\else
+%    \end{macrocode}
+% If there is an error, and it is begin separated, the problem arises
+% of the potential for ambiguous values.  This can only apply outside
+% of a table, as \opt{seperr} is disabled in tabular material.
+%    \begin{macrocode}
+    \ifsi@seperr
+      \ifsi@num@ambigerr
+        \protected@edef\si@num@out{%
+          \ensuremath{\si@openerr}\si@num@out}%
+        \si@repeatunitsfalse
+        \expandafter\si@num@erropentrue
+      \else
+%    \end{macrocode}
+% If there is an exponential part and an error, errors are being
+% separated and ambiguous errors are not trapped, then there is work
+% to do.  The exponent part is added to the \emph{error}, and deleted
+% from the mantissa if necessary.
+%    \begin{macrocode}
+        \ifsi@trapambigerr\else
+          \ifx\@empty\si@num@exp\@empty\else
+            \protected@edef\si@num@err{%
+              \si@num@err\expandafter\@car\si@numexp\@nil
+              \si@num@expsign\si@num@exp}%
+            \ifsi@repeatunits\else
+              \renewcommand*{\si@num@exp}{}%
+              \renewcommand*{\si@num@expsign}{}%
+            \fi
+          \fi
+        \fi
+      \fi
+%    \end{macrocode}
+% If \opt{seperr} is not in force, the error and mantissa have to be
+% recombined.  This is handled so that the same macro deals with
+% tables and normal processing.
+%    \begin{macrocode}
+    \else
+      \expandafter\protected@edef\csname
+        si@\si@tempa @out\endcsname{%
+          \si@num@out\ensuremath{\si@errspace}\ensuremath
+          {\si@openerr}\si@num@err\ensuremath{\si@closeerr}}%
+      \renewcommand*{\si@num@err}{}%
+    \fi
+  \fi
+%    \end{macrocode}
+% The main reconstruction can now occur.  This performs various
+% checks on the validity of the input, and adds the necessary
+% ``filler'' between the supplied data.
+%    \begin{macrocode}
+  \renewcommand*{\si@tempa}{num@out}%
+  \ifsi@num@erropen
+    \renewcommand*{\si@tempa}{num@ambig}%
+  \fi
+  \ifsi@num@intab
+    \renewcommand*{\si@tempa}{tab@expout}%
+  \fi
+  \ifx\@empty\si@num@exp\@empty
+    \ifx\@empty\si@num@mant\@empty
+      \si@log@err{Invalid number format `\si@num@arg'}
+        {Something is wrong with the number format; does it
+         contain \MessageBreak any numbers (from the list
+         `\si@numdigits')?}%
+      \renewcommand*\si@num@out{}%
+    \fi
+  \else
+    \ifx\@empty\si@num@mant\@empty\else
+      \expandafter\protected@edef\csname
+        si@\si@tempa\endcsname{%
+          \csname si@\si@tempa\endcsname\ensuremath{{}%
+          \si@expproduct{}}}%
+    \fi
+    \expandafter\protected@edef\csname
+      si@\si@tempa\endcsname{%
+        \csname si@\si@tempa\endcsname\si@expbase
+        \textsuperscript{\ensuremath{\si@num@expsign}%
+        \si@num@exp}}%
+  \fi
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+% With everything done, the result is output.
+%    \begin{macrocode}
+  \ifsi@num@intab\else
+    \expandafter\si@num@out
+  \fi
+%    \end{macrocode}
+% If there is anything inside the ``x-part'', then there is now
+% more work to do.
+%    \begin{macrocode}
+  \ifx\@empty\si@num@err\@empty\else
+    \expandafter\si@num@procerr
+  \fi
+  \ifsi@num@erropen
+    \expandafter\si@out@num\expandafter{%
+      \ensuremath{\si@closeerr}}%
+      \ifx\@empty\si@num@ambig\@empty\else
+        \expandafter\si@out@num\expandafter{\si@num@ambig}%
+        \renewcommand*{\si@num@ambig}{}%
+    \fi
+  \fi
+  \si@num@erropenfalse
+  \ifx\@empty\si@num@xpart\@empty\else
+    \expandafter\si@num@sepxpart
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@findxpart}
+% Before processing the number, any multiplied parts have to be found
+% and removed.  As there can be more than one product sign, the
+% building process here has no error checking.
+%    \begin{macrocode}
+\def\si@num@findxpart#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@numprod}
+    {\si@switchtrue\si@seperrfalse}{}%
+  \ifsi@switch
+    \protected@edef\si@num@xpart{\si@num@xpart#1}%
+  \else
+    \protected@edef\si@num@in{\si@num@in#1}%
+  \fi
+  \ifx\@empty#2\@empty\else
+    \si@num@findxpart#2\@empty
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@sepmantexp}
+%\begin{macro}{\si@num@mantexp}
+% Splitting the mantissa and exponent first checks for characters to
+% gobble, which are simply thrown away.  For any other input, there
+% are two possibilities.  If the character is an exponent marker,
+% then the package switches from collecting the mantissa to
+% collecting the exponent (after a sanity check).  All other
+% characters are added to either the mantissa or the exponent, as
+% appropriate.\\
+%\cs{si@num@sepmantexp}\marg{num}\\
+%\cs{si@num@mantexp}\meta{char}\meta{chars}\cs{@empty}
+%    \begin{macrocode}
+\newcommand*{\si@num@sepmantexp}[1]{%
+  \expandafter\si@num@mantexp#1\@empty\@empty}
+\def\si@num@mantexp#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@numgobble}
+    {\si@log@debug{Gobbling `#1' in \si@num@arg}}
+    {\si@str@ifchrstr{#1}{\si@numexp}
+       {\ifsi@switch
+          \si@log@err{Duplicate exponent marker found}
+            {Only a single exponent character \MessageBreak
+            (from the list `\si@numexp')\MessageBreak may
+            occur in a numerical argument}%
+        \else
+          \si@log@debug{Exponent marker `#1' found in
+            `\si@num@arg'}%
+        \fi
+        \si@switchtrue}%
+       {\ifsi@switch
+          \expandafter\si@num@addexp
+        \else
+          \expandafter\si@num@addmnt
+        \fi
+        {#1}}}%
+%    \end{macrocode}
+% If the recursion has not bottomed out, another loop occurs.
+%    \begin{macrocode}
+  \ifx\@empty#2\@empty
+    \expandafter\@gobble
+  \else
+    \expandafter\si@num@sepmantexp
+  \fi
+  {#2}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@addmnt}
+%\begin{macro}{\si@num@addexp}
+%\begin{macro}{\si@num@addmntexp}
+% To allow \cs{expandafter} use in the above, the actual addition to the
+% appropriate macro is handled here.\\
+%\cs{si@num@addmnt}\marg{char}\\
+%\cs{si@num@addexp}\marg{char}\\
+%\cs{si@num@addmntexp}\marg{char}\marg{mant/exp}\marg{text}
+%    \begin{macrocode}
+\newcommand*{\si@num@addmnt}[1]{%
+  \si@num@addmntexp{#1}{mant}{mantissa}}
+\newcommand*{\si@num@addexp}[1]{%
+  \si@num@addmntexp{#1}{exp}{exponent}}
+\newcommand*{\si@num@addmntexp}[3]{%
+  \si@log@debug{Adding `#1' to #3 for `\si@num@arg'}%
+  \expandafter\protected@edef\csname si@num@#2\endcsname{%
+    \csname si@num@#2\endcsname#1}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@sepsign}
+% The input is now tested for a sign.  If one exists, it is
+% transferred into the \cs{si@num@}|#1sign| storage macro, with the
+% remained of the number in \cs{si@num@}|#1|.  The only check made
+% directly here is that there is something to process.\\
+%\cs{si@num@sepsign}\marg{mant/exp}
+%    \begin{macrocode}
+\newcommand*{\si@num@sepsign}[1]{%
+  \expandafter\ifx\expandafter\@empty
+    \csname si@num@#1\endcsname\@empty
+    \expandafter\@gobble
+  \else
+    \expandafter\si@num@gensign
+  \fi
+  {#1}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@gensign}
+% The sign generator starts by calling the procedure to check if the
+% input contains a valid one- or two-digit sign.  The results are
+% returned as \cs{si@num@sign} and \cs{si@num@value}.\\
+%\cs{si@num@gensign}\marg{mant/exp}
+%    \begin{macrocode}
+\newcommand*{\si@num@gensign}[1]{%
+  \expandafter\expandafter\expandafter\si@num@findsign
+    \csname si@num@#1\endcsname\@empty\@empty
+%    \end{macrocode}
+% If no sign has been found, then there may be a need to add one
+% anyway.
+%    \begin{macrocode}
+  \ifx\@empty\si@num@sign\@empty
+    \ifx\@empty\si@num@value\@empty
+      \expandafter\expandafter\expandafter\@gobble
+    \else
+      \expandafter\expandafter\expandafter\si@num@addsign
+    \fi
+  \else
+    \expandafter\@gobble
+  \fi
+  {#1}%
+%    \end{macrocode}
+% The appropriate storage areas are now assigned.
+%    \begin{macrocode}
+  \expandafter\let\csname si@num@#1sign\endcsname\si@num@sign
+  \expandafter\let\csname si@num@#1\endcsname\si@num@value}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@findsign}
+%\begin{macro}{\si@num@sign}
+%\begin{macro}{\si@num@value}
+% The first one or two characters of the mantissa or exponent may
+% contain a sign.  To test for this, the first two characters of the
+% number are split off, and examined.  Two characters are used so
+% that \cs{pm} and \cs{mp} can be represented by |+-| and |-+|,
+% respectively. To allow the user to alter the valid signs, but
+% retain this conversion, the generic character test is used before
+% checking specific matches.\\
+%\cs{si@num@findsign}\meta{char}\meta{char}\meta{chars}\cs{@empty}
+%    \begin{macrocode}
+\newcommand*{\si@num@sign}{}
+\def\si@num@findsign#1#2#3\@empty{%
+  \si@num@delplusfalse
+  \si@str@ifchrstr{#1}{\si@numsign}{%
+    \si@str@ifchrstr{#2}{\si@numsign}{%
+      \if +#1%
+        \if -#2%
+          \si@log@debug{Found sign combination +- for
+            `\si@num@arg'}%
+          \renewcommand*{\si@num@sign}{{\si@pm}}%
+        \else
+          \si@log@inf{Unknown sign combination `#1#2'}%
+          \renewcommand*{\si@num@sign}{{#1#2}}%
+        \fi
+      \else
+        \if -#1%
+          \if +#2%
+            \si@log@debug{Found sign combination -+ for
+              `\si@num@arg'}%
+            \renewcommand*{\si@num@sign}{{\mp}}%
+          \else
+            \si@log@inf{Unknown sign combination `#1#2'}%
+            \renewcommand*{\si@num@sign}{{#1#2}}%
+          \fi
+        \else
+          \si@log@inf{Unknown sign combination `#1#2'}%
+          \renewcommand*{\si@num@sign}{{#1#2}}%
+        \fi
+      \fi
+      \protected@edef\si@num@value{#3}}%
+%    \end{macrocode}
+% Only one valid sign character.
+%    \begin{macrocode}
+      {\si@log@debug{Found single sign character `#1' for
+         `\si@num@arg'}%
+       \renewcommand*{\si@num@sign}{{#1}}%
+       \if +#1%
+         \ifsi@retainplus\else
+           \expandafter\expandafter\expandafter\si@num@killsign
+         \fi
+       \fi
+       \protected@edef\si@num@value{#2#3}}}%
+%    \end{macrocode}
+% No valid sign, so \cs{@empty} is returned for the sign .
+%    \begin{macrocode}
+    {\si@log@debug{No sign found for `\si@num@arg'}%
+     \renewcommand*{\si@num@sign}{}%
+     \protected@edef\si@num@value{#1#2#3}}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@num@delplus}
+%\begin{macro}{\si@num@killsign}
+% A simple spin-out to remove a plus sign.  A flag is set as it might
+% be useful to know this.
+%    \begin{macrocode}
+\newif\ifsi@num@delplus
+\newcommand*{\si@num@killsign}{%
+  \si@num@delplustrue
+  \renewcommand*{\si@num@sign}{}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@addsign}
+%\begin{macro}{\si@num@asign}
+% The macro to add a sign to an unsigned number has to check whether
+% this is a mantissa or an exponent.  The result is still placed in
+% \cs{si@num@sign} for ease of processing later.\\
+%\cs{si@num@addsign}\marg{mant/exp}\\
+%\cs{si@num@asign}\marg{mantissa/exponent}
+%    \begin{macrocode}
+\newcommand*{\si@num@addsign}[1]{%
+  \begingroup
+    \renewcommand*{\si@tempa}{#1}%
+    \renewcommand*{\si@tempb}{mant}%
+    \ifx\si@tempa\si@tempb
+      \aftergroup\@firstoftwo
+    \else
+      \aftergroup\@secondoftwo
+    \fi
+  \endgroup
+  {\ifsi@num@signmant
+     \expandafter\si@num@asign
+   \else
+     \expandafter\@gobble
+   \fi
+   {mantissa}}
+  {\ifsi@num@signexp
+     \expandafter\si@num@asign
+   \else
+     \expandafter\@gobble
+   \fi
+   {exponent}}}
+\newcommand*{\si@num@asign}[1]{%
+  \let\si@num@sign\si@sign
+  \si@log@debug{Adding sign \si@sign\space to #1 for
+    `\si@num@arg'}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@procnum}
+% The control macro for processing the number (plus any extra
+% characters).
+%\cs{si@num@finddigits}\marg{mant/exp}
+%    \begin{macrocode}
+\newcommand*{\si@num@procnum}[1]{%
+  \expandafter\ifx\expandafter\@empty
+    \csname si@num@#1\endcsname\@empty
+    \expandafter\@gobble
+  \else
+    \expandafter\si@num@finddigits
+  \fi
+  {#1}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@predec}
+%\begin{macro}{\si@num@postdec}
+% Two new storage areas are defined.
+%    \begin{macrocode}
+\newcommand*{\si@num@predec}{}
+\newcommand*{\si@num@postdec}{}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@finddigits}
+% The core digit processor divides the number into the parts before
+% and after the decimal point marker.  The temporary switch is used
+% to indicate finding a decimal marker.\\
+%\cs{si@num@finddigits}\marg{mant/exp}
+%    \begin{macrocode}
+\newcommand*{\si@num@finddigits}[1]{%
+  \renewcommand*{\si@num@predec}{}%
+  \renewcommand*{\si@num@postdec}{}%
+  \si@switchfalse
+  \expandafter\expandafter\expandafter\si@num@digits
+    \csname si@num@#1\endcsname\@empty\@empty
+%    \end{macrocode}
+% Tests are now made to see if padding zeros are needed.  The
+% trailing test needs to verify if a decimal marker was found, as
+% well as if a zero is needed.
+%    \begin{macrocode}
+  \ifx\@empty\si@num@predec\@empty
+    \ifsi@num@padlead
+      \expandafter\expandafter\expandafter\si@num@addprezero
+    \fi
+  \fi
+  \ifx\@empty\si@num@postdec\@empty
+    \ifsi@num@padtrail
+      \ifsi@switch
+        \expandafter\expandafter\expandafter\expandafter
+          \expandafter\expandafter\expandafter
+          \si@num@addpostzero
+      \fi
+    \fi
+  \fi
+%    \end{macrocode}
+% The next checks to make concern input validity in a more
+% mathematical sense.  First, if the number is zero, then no sign
+% should be given under any circumstances.  Then leading zeros need
+% to be removed from the input.  This is slightly complicated by the
+% potential presence of ``extra'' characters.
+%    \begin{macrocode}
+  \si@num@unsign{#1}%
+  \ifx\@empty\si@num@predec\@empty
+  \else
+    \expandafter\si@num@nozero
+  \fi
+%    \end{macrocode}
+% A sanity check is made to ensure that the supplied number consisted
+% of more than a decimal marker.
+%    \begin{macrocode}
+  \ifx\@empty\si@num@predec\@empty
+    \ifx\@empty\si@num@postdec\@empty
+      \expandafter\expandafter\expandafter\@gobble
+    \else
+      \expandafter\expandafter\expandafter\si@num@sepdigits
+    \fi
+  \else
+    \expandafter\si@num@sepdigits
+  \fi
+  {#1}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@digits}
+%\begin{macro}{\si@num@pre}
+%\begin{macro}{\si@num@post}
+%\begin{macro}{\si@num@prepost}
+% The \cs{si@num@digits} macro compares each character in the input
+% against the list of characters valid at this stage: numbers,
+% decimal markers and ``extra'' characters.
+%\cs{si@num@digits}\meta{char}\meta{chars}\cs{@empty}\\
+%\cs{si@num@pre}\marg{num}\\
+%\cs{si@num@pre}\marg{num}\\
+%\cs{si@num@prepost}\marg{num}\marg{pre/post}\marg{text}
+%    \begin{macrocode}
+\def\si@num@digits#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@numdecimal}
+    {\ifsi@switch
+       \si@log@err{Duplicate decimal marker in `\si@num@arg'}
+         {Only a single decimal marker (from the list
+            `\si@numdecimal')\MessageBreak may occur in a
+            numerical argument}%
+     \else
+       \si@log@debug{Found decimal marker `#1' in
+         `\si@num@arg'}%
+       \expandafter\si@switchtrue
+     \fi}
+%    \end{macrocode}
+% The earlier code only checks for a sign at the start of the text. A
+% check is therefore needed for a sign after the first two
+% characters; if one is found, it is ignored.
+%    \begin{macrocode}
+    {\si@str@ifchrstr{#1}{\si@numsign}
+       {\si@log@err{Misplaced sign character
+          `#1' in `\si@num@arg'}
+          {Sign characters `\si@numsign' can only
+            occur\MessageBreak at the start of a number}}
+%    \end{macrocode}
+% The current character is added to the appropriate stack; this is
+% ``spun out'' to avoid problems with expansion of the switch code.
+%    \begin{macrocode}
+       {\ifsi@switch
+          \expandafter\si@num@post
+        \else
+          \expandafter\si@num@pre
+        \fi
+        {#1}}}%
+  \ifx\@empty#2\@empty\else
+    \si@num@digits#2\@empty\@empty
+  \fi}
+\newcommand*{\si@num@pre}[1]{%
+  \si@num@prepost{#1}{pre}{integer}}
+\newcommand*{\si@num@post}[1]{%
+  \si@num@prepost{#1}{post}{decimal}}
+\newcommand*{\si@num@prepost}[3]{%
+  \expandafter\protected@edef\csname si@num@#2dec\endcsname{%
+    \csname si@num@#2dec\endcsname#1}%
+  \si@log@debug{Adding `#1' to #3 part for `\si@num@arg'}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@addprezero}
+%\begin{macro}{\si@num@addpostzero}
+%\begin{macro}{\si@num@addpzero}
+% A similar set of macros are used for the padding zeros.\\
+%\cs{si@num@addpzero}\marg{pre/post}\marg{text}
+%    \begin{macrocode}
+\newcommand*{\si@num@addprezero}{%
+  \si@num@addpzero{pre}{leading}}
+\newcommand*{\si@num@addpostzero}{%
+  \si@num@addpzero{post}{trailing}}
+\newcommand*{\si@num@addpzero}[2]{%
+  \si@log@debug{Adding #2 zero for `\si@num@arg'}%
+  \@namedef{si@num@#1dec}{0}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@unsign}
+%\begin{macro}{\si@num@nosign}
+% The trap for a sign with zero numerical input is made.  First, a
+% check is made to see if there is a sign to worry about.  The pre-
+% and post-decimal parts are then examined, to see if they contain
+% something other than ``0'' or an extra character.\\
+%\cs{si@num@unsign}\marg{mant/exp}\\
+%\cs{si@num@nosign}\marg{mant/exp}
+%    \begin{macrocode}
+\newcommand*{\si@num@unsign}[1]{%
+  \expandafter\ifx\expandafter\@empty
+    \csname si@num@#1sign\endcsname\@empty
+    \expandafter\@gobble
+  \else
+    \expandafter\si@num@nosign
+  \fi
+  {#1}}
+\newcommand*{\si@num@nosign}[1]{%
+  \begingroup
+    \si@switchtrue
+    \si@str@ifonlychrs{\si@num@predec\si@num@postdec}{0}
+      {\si@switchfalse}{}%
+    \ifsi@switch
+      \aftergroup\@gobble
+    \else
+      \aftergroup\@firstofone
+    \fi
+  \endgroup
+  {\si@log@debug{Zero value: removing any sign}%
+   \ifsi@ang@sign\else
+     \@namedef{si@num@#1sign}{}%
+   \fi}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@nozero}
+%  A very short test for a totally zero pre-decimal component.
+%    \begin{macrocode}
+\newcommand*{\si@num@nozero}{%
+  \si@str@ifonlychrs{\si@num@predec}{0}
+    {\renewcommand*{\si@num@predec}{0}}{}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@decimalhook}
+% A hook is needed to attach things inside the group to happen
+% afterwards, if the number is a decimal.
+%    \begin{macrocode}
+\newcommand*{\si@num@decimalhook}{}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@sepdigits}
+% The \cs{si@num@sepdigits} macro is only called if at least one of
+% the mantissa and exponent contain something to output.\\
+%\cs{si@num@sepdigits}\marg{mant/exp}
+%    \begin{macrocode}
+\newcommand*{\si@num@sepdigits}[1]{%
+%    \end{macrocode}
+% First an overall check is needed for additional characters.  By
+% altering the contents of \cs{si@numextra}, the same code can be
+% shared by two different checks.
+%    \begin{macrocode}
+  \begingroup
+    \let\si@numextra\si@numaddn
+    \protected@edef\si@tempa{\si@num@predec\si@num@postdec}%
+    \si@num@ifextra{\si@tempa}
+      {\aftergroup\@gobble}
+      {\aftergroup\@firstofone}%
+  \endgroup
+%    \end{macrocode}
+% Separation of the error in a number from the number itself is only
+% attempted for the mantissa.
+%    \begin{macrocode}
+  {\renewcommand*{\si@tempb}{mant}%
+   \renewcommand*{\si@tempc}{#1}%
+   \ifx\si@tempb\si@tempc
+     \expandafter\si@num@checkerr
+   \fi}%
+%    \end{macrocode}
+% If both parts of the number contain only digits, then any rounding
+% can be attempted if there is no error part.  Otherwise, the input
+% must be left alone.
+%    \begin{macrocode}
+  \protected@edef\si@tempa{\si@num@predec\si@num@postdec}%
+  \expandafter\si@str@ifonlychrs\expandafter{\si@tempa}
+    {0123456789}
+    {\ifx\@empty\si@num@err\@empty
+       \ifsi@fixdp
+         \expandafter\expandafter\expandafter\si@num@fixdp
+       \fi
+     \fi}{}%
+%    \end{macrocode}
+% If the pre-decimal part contains nothing except numbers, then
+% digit separation is carried out.
+%    \begin{macrocode}
+  \si@num@ifextra{\si@num@predec}{}
+    {\expandafter\si@num@int\expandafter{\si@num@predec}}%
+%    \end{macrocode}
+% A decision is made about the decimal sign, then digit separation
+% occurs on the post-decimal part of the number.
+%    \begin{macrocode}
+  \renewcommand*{\si@tempc}{}%
+  \ifx\@empty\si@num@postdec\@empty\else
+    \si@num@decimalhook
+    \renewcommand*{\si@tempc}{%
+      \ensuremath{{\si@decimalsymbol}}}%
+    \si@num@ifextra{\si@num@postdec}{}
+      {\expandafter\si@num@dec\expandafter{\si@num@postdec}}%
+  \fi
+%    \end{macrocode}
+% The construction is finalised by re-combining the number.
+%    \begin{macrocode}
+  \expandafter\protected@edef\csname si@num@#1\endcsname
+    {\si@num@predec\si@tempc\si@num@postdec}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@ifextra}
+%\begin{macro}{\si@num@extra}
+% A relatively simple test for ``extra'' characters.  Once again, a
+% bit of group trickery is used.\\
+%\cs{si@num@ifextra}\marg{integer}\\
+%\cs{si@num@extra}\meta{char}\meta{chars}\cs{@empty}
+%    \begin{macrocode}
+\newcommand*{\si@num@ifextra}[1]{%
+  \begingroup
+    \si@switchfalse
+    \expandafter\si@num@extra#1\@empty\@empty
+    \ifsi@switch
+      \si@log@debug{Found `extra' characters in `#1'}%
+      \aftergroup\@firstoftwo
+    \else
+      \aftergroup\@secondoftwo
+    \fi
+  \endgroup}
+\def\si@num@extra#1#2\@empty{%
+  \ifx\@empty#1\@empty\else
+    \si@str@ifchrstr{#1}{\si@numextra}{\si@switchtrue}{}%
+    \ifx\@empty#2\@empty\else
+      \si@num@extra#2\@empty\@empty
+    \fi
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@num@ambigerr}
+%\begin{macro}{\si@num@checkerr}
+% When separating out an error from a number, the first step is to
+% see if there is a decimal part to the number.  If so, any error
+% must be in that part of the decimal part; it is not possible to
+% have an error starting in the integer part and continuing into the
+% decimal part.
+%    \begin{macrocode}
+\newif\ifsi@num@ambigerr
+\newcommand*{\si@num@checkerr}{%
+  \ifx\@empty\si@num@postdec\@empty
+    \expandafter\si@num@preerr
+  \else
+    \expandafter\si@num@posterr
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@preerr}
+% Errors in integers are easy to handle.  After finding the error,
+% the result is simply stored in the error macro \cs{si@num@err}.
+%    \begin{macrocode}
+\newcommand*{\si@num@preerr}{%
+  \si@num@seperr{pre}%
+  \ifx\@empty\si@tempb\@empty\else
+    \expandafter\renewcommand\expandafter*\expandafter
+      \si@num@err\expandafter{\si@tempb}%
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@posterr}
+%\begin{macro}{\si@num@psterr}
+% Life is more complex for an error in the decimal part.  This is
+% found, then it may need zero-filling or the insertion of a decimal
+% point.  This depends on whether the number of error digits is
+% larger than the number of post-decimal digits.
+%    \begin{macrocode}
+\newcommand*{\si@num@posterr}{%
+  \si@num@seperr{post}%
+  \ifx\@empty\si@tempb\@empty\else
+    \ifsi@seperr
+      \expandafter\expandafter\expandafter\si@num@psterr
+    \else
+      \let\si@num@err\si@tempb
+    \fi
+  \fi}
+\newcommand*{\si@num@psterr}{%
+    \si@num@cntdigits{\si@tempb}%
+    \si@tempcntb\si@tempcnta\relax
+    \si@num@cntdigits{\si@num@postdec}%
+    \ifnum\si@tempcnta<\si@tempcntb\relax
+      \expandafter\si@num@largeerr
+    \else
+      \expandafter\si@num@smallerr
+    \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@seperr}
+%\begin{macro}{\si@num@finderr}
+% The usual hand-off is made for searching for an error.\\
+%\cs{si@num@seperr}\marg{pre/post}\\
+%\cs{si@num@finderr}\meta{char}\meta{chars}\cs{@empty}
+%    \begin{macrocode}
+\newcommand*{\si@num@seperr}[1]{%
+  \si@switchfalse
+  \renewcommand*{\si@tempa}{}%
+  \renewcommand*{\si@tempb}{}%
+  \expandafter\expandafter\expandafter\si@num@finderr
+    \csname si@num@#1dec\endcsname\@empty\@empty
+  \ifx\@empty\si@tempb\@empty\else
+    \expandafter\let\csname si@num@#1dec\endcsname\si@tempa
+  \fi}
+\def\si@num@finderr#1#2\@empty{%
+%    \end{macrocode}
+% First a check for the opening character of an error.
+%    \begin{macrocode}
+  \si@str@ifchrstr{#1}{\si@numopenerr}
+%    \end{macrocode}
+% If the switch is set when an error is found, then something is
+% wrong.
+%    \begin{macrocode}
+    {\ifsi@switch
+       \si@log@err{Invalid error in number}
+         {The numerical argument \si@num@arg\space has two (or
+           more)\MessageBreak error-opening characters}%
+     \else
+       \expandafter\si@switchtrue
+     \fi}
+%    \end{macrocode}
+% The end-of-error character has to be the last item of the input,
+% and an error needs to start before it ends.
+%    \begin{macrocode}
+    {\si@str@ifchrstr{#1}{\si@numcloseerr}
+       {\ifsi@switch
+          \ifx\@empty#2\@empty\else
+            \si@log@err{Invalid error in number}
+              {The numerical argument \si@num@arg\space has an
+              error-closing before the last character}%
+          \fi
+        \else
+          \si@log@err{Invalid error in number}
+           {The numerical argument \si@num@arg\space has an
+              error-closing character\MessageBreak but no
+              error-opening one}%
+        \fi}
+%    \end{macrocode}
+% The input must be a digit.  It is stored in the appropriate area.
+%    \begin{macrocode}
+       {\ifsi@switch
+          \expandafter\si@num@addtmpb
+        \else
+          \expandafter\si@num@addtmpa
+        \fi
+        {#1}}}%
+  \ifx\@empty#2\@empty\else
+    \si@num@finderr#2\@empty
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@addtmpa}
+%\begin{macro}{\si@num@addtmpb}
+%\begin{macro}{\si@num@addtmp}
+% Some quick methods for adding to the temporary macros with \cs{if}
+% expansion.\\
+%\cs{si@num@addtmpa}\marg{num}\\
+%\cs{si@num@addtmpb}\marg{num}\\
+%\cs{si@num@addtmp}\marg{a/b}\marg{num}
+%    \begin{macrocode}
+\newcommand*{\si@num@addtmpa}[1]{\si@num@addtmp{a}{#1}}
+\newcommand*{\si@num@addtmpb}[1]{\si@num@addtmp{b}{#1}}
+\newcommand*{\si@num@addtmp}[2]{%
+  \expandafter\protected@edef\csname si@temp#1\endcsname{%
+    \csname si@temp#1\endcsname#2}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@cntdigits}
+%\begin{macro}{\si@num@cntdgt}
+% A recursive system for counting the number of characters in a given
+% input; only used here to count digits in a number.\\
+%\cs{si@num@cntdigits}\marg{num}\\
+%\cs{si@num@cntdgt}\meta{char}\meta{chars}\cs{@empty}
+%    \begin{macrocode}
+\newcommand*{\si@num@cntdigits}[1]{%
+  \si@tempcnta\z@\relax
+  \expandafter\si@num@cntdgt#1\@empty\@empty}
+\def\si@num@cntdgt#1#2\@empty{%
+  \ifx\@empty#1\@empty\else
+    \advance\si@tempcnta\@ne\relax
+  \fi
+  \ifx\@empty#2\@empty\else
+    \expandafter\si@num@cntdgt#2\@empty
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@smallerr}
+%\begin{macro}{\si@num@serr}
+% For handling an error with no more digits than the post-decimal
+% part of a number, zero-padding is undertaken before adding a
+% decimal sign and (possibly) leading zero.
+%    \begin{macrocode}
+\newcommand*{\si@num@smallerr}{%
+  \si@tempcntb\si@tempcnta\relax
+  \si@num@serr
+  \protected@edef\si@num@err{%
+    \ifsi@num@padlead0\fi\expandafter\@car\si@numdecimal\@nil
+    \si@tempb}}
+\newcommand*{\si@num@serr}{%
+  \si@num@cntdigits{\si@tempb}%
+  \ifnum\si@tempcnta=\si@tempcntb\relax\else
+    \protected@edef\si@tempb{0\si@tempb}%
+    \expandafter\si@num@serr
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@largeerr}
+%\begin{macro}{\si@num@lerr}
+%\begin{macro}{\si@num@movedigit}
+% When the error has more digits than the decimal part, some
+% shuffling is needed.\\
+%\cs{si@num@movedigit}\meta{char}\meta{chars}\cs{@empty}
+%    \begin{macrocode}
+\newcommand*{\si@num@largeerr}{%
+  \renewcommand*{\si@tempa}{}%
+  \si@tempcntb\si@tempcnta\relax
+  \si@num@lerr
+  \protected@edef\si@num@err{%
+    \si@tempa\ensuremath{\si@decimalsymbol}\si@tempb}}
+\newcommand*{\si@num@lerr}{%
+  \si@num@cntdigits{\si@tempb}%
+  \ifnum\si@tempcnta=\si@tempcntb\relax\else
+    \expandafter\si@num@movedigit\si@tempb\@empty\@empty
+    \si@num@lerr
+  \fi}
+\def\si@num@movedigit#1#2\@empty{%
+  \protected@edef\si@tempa{\si@tempa#1}%
+  \protected@edef\si@tempb{#2}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@fixdp}
+% The test for fixing decimal places starts by counting up the number
+% of decimal digits.  The number is then padded, rounded or left
+% alone.
+%    \begin{macrocode}
+\newcommand*{\si@num@fixdp}{%
+  \si@num@cntdigits{\si@num@postdec}%
+  \ifx\@empty\si@num@postdec\@empty
+    \si@tempcnta\z@\relax
+  \fi
+  \ifnum\si@tempcnta>\si@num@dp\relax
+    \expandafter\si@num@round
+  \else
+    \ifnum\si@tempcnta<\si@num@dp\relax
+      \expandafter\expandafter\expandafter\si@num@pad
+    \fi
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@pad}
+%\begin{macro}{\si@num@pd}
+% Padding a number is a relatively easy matter.  The number of digits
+% is increased by adding ``$0$'' recursively.
+%    \begin{macrocode}
+\newcommand*{\si@num@pad}{%
+  \si@log@debug{Padding to \the\si@num@dp\space digits}%
+  \loop\ifnum\si@tempcnta<\si@num@dp\si@num@pd\repeat}
+\newcommand*{\si@num@pd}{%
+  \advance\si@tempcnta\@ne\relax
+  \protected@edef\si@num@postdec{\si@num@postdec0}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@round}
+%\begin{macro}{\si@num@prernd}
+%\begin{macro}{\si@num@postrnd}
+%\begin{macro}{\si@num@reverse}
+%\begin{macro}{\si@num@rev}
+% Rounding a number is more complicated.  The main macro here relies
+% on several others.  The initial stage is to reverse the entire
+% number, to make life easier.  This is then undone by the other
+% macros as the output is constructed.\\
+%\cs{si@num@reverse}\marg{macro}\\
+%\cs{si@num@rev}\meta{char}\meta{chars}\cs{@empty}
+%    \begin{macrocode}
+\newcommand*{\si@num@prernd}{}
+\newcommand*{\si@num@postrnd}{}
+\newcommand*{\si@num@round}{%
+  \si@log@debug{Rounding to \the\si@num@dp\space digits}%
+  \si@num@reverse{\si@num@postdec}%
+  \si@num@reverse{\si@num@predec}%
+  \let\si@num@prernd\si@num@predec
+  \let\si@num@postrnd\si@num@postdec
+  \renewcommand*{\si@num@predec}{}%
+  \renewcommand*{\si@num@postdec}{}%
+  \si@switchfalse
+  \si@num@rnd}
+\newcommand*{\si@num@reverse}[1]{%
+  \renewcommand*{\si@tempa}{}%
+  \expandafter\si@num@rev#1\@empty\@empty
+  \let#1\si@tempa}
+\def\si@num@rev#1#2\@empty{%
+  \edef\si@tempa{#1\si@tempa}%
+  \ifx\@empty#2\@empty\else
+    \si@num@rev#2\@empty\@empty
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@rnd}
+%\begin{macro}{\si@num@rndpre}
+%\begin{macro}{\si@num@rndpost}
+% The core looping macro of the system simply divides the flow
+% between rounding before and after the decimal.  The two routines
+% are quite similar, but have subtly different requirements.  Both
+% take one character at a time from the input, increment if there is
+% a carry digit, check its value, and add to the output string.
+%    \begin{macrocode}
+\newcommand*{\si@num@rnd}{%
+  \ifnum\si@tempcnta>\z@\relax
+    \expandafter\si@num@rndpost
+  \else
+    \expandafter\si@num@rndpre
+  \fi}
+\newcommand*{\si@num@rndpre}{%
+  \expandafter\edef\expandafter\si@tempa\expandafter{%
+    \expandafter\@car\si@num@prernd\@nil}%
+  \expandafter\edef\expandafter\si@num@prernd\expandafter{%
+    \expandafter\@cdr\si@num@prernd\@nil}%
+  \si@tempcntb\si@tempa\relax
+  \ifsi@switch
+    \advance\si@tempcntb\@ne\relax
+  \fi
+  \si@switchfalse
+  \ifnum\si@tempcntb=10\relax
+    \si@tempcntb\z@\relax
+    \expandafter\expandafter\expandafter\si@switchtrue
+  \fi
+  \edef\si@num@predec{\the\si@tempcntb\si@num@predec}%
+  \ifx\@empty\si@num@prernd\@empty
+    \ifsi@switch
+      \edef\si@num@predec{1\si@num@predec}%
+    \fi
+  \else
+    \expandafter\si@num@rnd
+  \fi}
+\newcommand*{\si@num@rndpost}{%
+  \expandafter\edef\expandafter\si@tempa\expandafter{%
+    \expandafter\@car\si@num@postrnd\@nil}%
+  \expandafter\edef\expandafter\si@num@postrnd\expandafter{%
+    \expandafter\@cdr\si@num@postrnd\@nil}%
+  \si@tempcntb\si@tempa\relax
+  \ifsi@switch
+    \advance\si@tempcntb\@ne\relax
+  \fi
+  \si@switchfalse
+  \ifnum\si@tempcnta>\si@num@dp\relax
+    \ifnum\si@tempcntb>4\relax
+      \expandafter\expandafter\expandafter\si@switchtrue
+    \fi
+  \else
+    \ifnum\si@tempcntb=10\relax
+      \si@tempcntb\z@\relax
+      \expandafter\expandafter\expandafter\si@switchtrue
+    \fi
+    \edef\si@num@postdec{\the\si@tempcntb\si@num@postdec}%
+  \fi
+  \advance\si@tempcnta\m@ne\relax
+  \si@num@rnd}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@int}
+% The formatting code for separating thousands is taken more-or-less
+% directly from \SIstyle.  A few changes are made to fit the various
+% conventions here.  Following on from the code above, \cs{si@tempa}
+% is used to store the integer part of the number, and \cs{si@tempb}
+% is used for the decimal part.\\
+%\cs{si@num@int}\marg{integer-part}
+%    \begin{macrocode}
+\newcommand*{\si@num@int}[1]{%
+  \renewcommand*{\si@num@predec}{}%
+  \ifsi@sepfour
+    \si@num@intfmt{}#1\@empty\@empty\@empty
+  \else
+    \si@num@iffive{#1}
+      {\si@num@intfmt{}#1\@empty\@empty\@empty}
+      {\renewcommand*{\si@num@predec}{#1}}%
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@iffive}
+%\begin{macro}{\si@num@five}
+% A test is needed for the presence of more than four characters.\\
+%\cs{si@num@iffive}\marg{num}\\
+%\cs{si@num@five}\meta{char}\meta{char}\meta{char}\meta{char}^^A
+%\meta{chars}\cs{end}
+%    \begin{macrocode}
+\newcommand*{\si@num@iffive}[1]{%
+  \si@num@five#1\@empty\@empty\@empty\@empty\@empty\end}
+\def\si@num@five#1#2#3#4#5\end{%
+   \ifx\@empty#5\@empty
+      \expandafter\@secondoftwo
+   \else
+      \expandafter\@firstoftwo
+   \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@intfmt}
+%\begin{macro}{\si@num@fiint}
+% The business end of the integer formatter.\\
+%\cs{si@num@intfmt}\marg{char}\marg{char}\marg{char}\marg{char}\\
+%\cs{si@num@fiint}\meta{chars}\cs{fi}\cs{fi}\cs{fi}
+%    \begin{macrocode}
+\newcommand*{\si@num@intfmt}[4]{%
+  \ifx\@empty#2\@empty
+    \si@num@intsep#1\relax
+  \else
+    \ifx\@empty#3\@empty
+      \si@num@intsep\@empty\@empty#1#2\relax
+    \else
+      \ifx\@empty#4\@empty
+        \si@num@intsep\@empty#1#2#3\relax
+      \else
+        \si@num@fiint{#1#2#3#4}%
+      \fi
+    \fi
+  \fi}
+\def\si@num@fiint#1\fi\fi\fi{\fi\fi\fi\si@num@intfmt{#1}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@intsep}
+% For adding separation to integers, an extra function is needed.\\
+%\cs{si@num@intsep}\marg{char}\marg{char}\marg{char}\marg{char}
+%    \begin{macrocode}
+\newcommand*{\si@num@intsep}[4]{%
+  \protected@edef\si@num@predec{\si@num@predec#1#2#3}%
+  \if\relax#4\relax\else
+    \protected@edef\si@num@predec{%
+      \si@num@predec\ensuremath{\noexpand\si@digitsep}}%
+    \expandafter\si@num@intsep\expandafter#4%
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@dec}
+%\begin{macro}{\si@num@decfmt}
+% Formatting a decimal uses a similar mechanism, but with a few
+% alterations needed.\\
+%\cs{si@num@dec}\marg{decimal-part}\\
+%\cs{si@num@decfmt}\marg{char}\marg{char}\marg{char}\marg{char}
+%    \begin{macrocode}
+\newcommand*{\si@num@dec}[1]{%
+  \renewcommand*{\si@num@postdec}{}%
+  \ifsi@sepfour
+    \si@num@decfmt#1\@empty\@empty\@empty\@empty
+  \else
+    \si@num@iffive{#1}
+      {\si@num@decfmt#1\@empty\@empty\@empty\@empty}
+      {\protected@edef\si@num@postdec{\si@num@postdec#1}}%
+  \fi}
+\newcommand*{\si@num@decfmt}[4]{%
+  \protected@edef\si@num@postdec{\si@num@postdec#1#2#3}%
+  \ifx\@empty#4\@empty%
+  \else
+    \protected@edef\si@num@postdec{%
+      \si@num@postdec\ensuremath{\noexpand\si@digitsep}}%
+    \expandafter\si@num@decfmt\expandafter#4%
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@num@procerr}
+% Any error is recycled to to formatted correctly.  The $\pm$ sign,
+% and any unit, are also added.
+%    \begin{macrocode}
+\newcommand*{\si@num@procerr}{%
+  \si@num@addunit
+  \ensuremath{\si@pm}%
+  \expandafter\si@num\expandafter{\si@num@err}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@sepxpart}
+% A similar approach for numbers containing products, except the
+% first token of the input has to be deleted.
+%    \begin{macrocode}
+\newcommand*{\si@num@sepxpart}{%
+  \si@num@addunit
+  \ensuremath{\times}%
+  \expandafter\expandafter\expandafter\si@num\expandafter
+    \expandafter\expandafter{%
+      \expandafter\@cdr\si@num@xpart\@nil}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@num@addunit}
+% A short macro to add units if needed.
+%    \begin{macrocode}
+\newcommand*{\si@num@addunit}{%
+  \si@unt@numtrue
+  \ifx\@empty\si@unt@unitarg\@empty\else
+    \ifsi@repeatunits
+      \si@unt@printunit{\si@unt@unitarg}%
+    \fi
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Formatting angles}
+%\begin{macro}{\ang}
+% The approach used here is similar to that in \SIstyle, but has been
+% modified in a few ways.\\
+%\cs{ang}\oarg{options}\marg{decimal-angle}\\
+%\cs{ang}\oarg{options}|{|\meta{deg};\meta{min};\meta{sec}|}|
+%    \begin{macrocode}
+\si@newrobustcmd*{\ang}[2][]{%
+  \begingroup
+    \sisetup{#1}%
+    \si@fam@mode
+    \si@log@debug{Processing \string\ang\space input `#2'}%
+    \@makeother{\;}%
+    \makeatletter
+    \scantokens{\si@ang@parse#2;;;\@nil}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@ang@parse}
+% With the correct catcodes in place, processing can take place strip
+% out the semi-colons.  Here, the input must either contain no
+% semi-colons or two semi-colons.\\
+%\cs{si@ang@parse}\meta{num}|;|\meta{num}|;|\meta{num}|;|^^A
+%\meta{chars}\cs{@nil}
+%    \begin{macrocode}
+\def\si@ang@parse#1;#2;#3;#4\@nil{%
+  \let\ifsi@ang@fixdp\ifsi@fixdp
+  \si@fixdpfalse
+  \si@ifmtarg{#4}
+    {\si@log@debug{Angle argument contains no
+       semi-colons:\MessageBreak decimal angle}%
+     \si@ang@dec{#1}{}{}}
+    {\si@log@debug{Angle argument contains
+       semi-colons:\MessageBreak degree-minute-second angle}%
+     \renewcommand*{\si@tempa}{#4}%
+     \renewcommand*{\si@tempb}{;;}%
+     \ifx\si@tempa\si@tempb\else
+       \ifsi@strictarc
+         \renewcommand*{\si@tempb}{;}%
+         \ifx\si@tempa\si@tempb
+           \si@log@err{Insufficient semi-colons in argument
+             of \string\ang}{The argument of
+             \string\ang\space  must contain either no
+             semi-colons or exactly two}%
+         \else
+           \si@log@err{Excess semi-colons in argument of
+             \string\ang}{The argument of \string\ang\space
+             must contain either no semi-colons or exactly
+             two}%
+         \fi
+       \fi
+     \fi
+     \si@ang@arc{#1}{#2}{#3}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@ang@dec}
+%\begin{macro}{\si@ang@arc}
+% Two tests are needed, in case the input format requires conversion.
+%    \begin{macrocode}
+\newcommand*{\si@ang@dec}{%
+  \let\si@ang@fix\@gobble
+  \ifsi@ang@toarc
+    \expandafter\si@ang@dectoarc
+  \else
+    \sisetup{padangle=none}\expandafter\si@ang@typeset
+  \fi}
+\newcommand*{\si@ang@arc}{%
+  \let\si@ang@fix\si@ang@arcfix
+  \ifsi@ang@todec
+    \expandafter\si@ang@arctodec
+  \else
+    \expandafter\si@ang@typeset
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@ang@fixdp}
+%\begin{macro}{\si@ang@fix}
+%\begin{macro}{\si@ang@arcfix}
+% A check is needed so that rounding and zero filling are only
+% applied to the seconds of an arc angle.
+%\cs{si@ang@fix}\marg{degree/minute/second}\\
+%\cs{si@ang@arcfix}\marg{degree/minute/second}
+%    \begin{macrocode}
+\newif\ifsi@ang@fixdp
+\newcommand*{\si@ang@fix}[1]{}
+\newcommand*{\si@ang@arcfix}[1]{%
+  \renewcommand*{\si@tempa}{second}%
+  \renewcommand*{\si@tempb}{#1}%
+  \ifx\si@tempa\si@tempb
+    \ifsi@ang@fixdp
+      \expandafter\expandafter\expandafter\si@fixdptrue
+    \else
+      \expandafter\expandafter\expandafter\si@fixdpfalse
+    \fi
+  \else
+    \expandafter\si@fixdpfalse
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@ang@ifnum}
+% A test is required to check that the provided data consists of
+% numbers which can actually be processed by \TeX.  This is achieved
+% by using \cs{si@num@ifvalid} with a fixed list of valid
+% characters.\\
+%\cs{si@ang@ifnum}\marg{num}
+%    \begin{macrocode}
+\newcommand*{\si@ang@ifnum}[1]{%
+  \begingroup
+    \renewcommand*{\si@numvalid}{0123456789,.+-}%
+    \ifx\@empty#1\@empty
+      \aftergroup\@firstoftwo
+    \else
+      \si@num@ifvalid{#1}
+        {\aftergroup\@firstoftwo}
+        {\aftergroup\@secondoftwo}%
+    \fi
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@ang@arctodec}
+% The business end of converting arcs to decimal angles is relatively
+% straight-forward, as it only needs one calculation.  This has to be
+% divided up, so that disaster does not strike if there are empty
+% arguments; a check is also needed for the sign of the angle,
+% so that the maths makes sense.\\
+%\cs{si@ang@arctodec}\marg{dec}\marg{min}\marg{sec}
+%    \begin{macrocode}
+\newcommand*{\si@ang@arctodec}[3]{%
+  \let\si@ang@fix\@gobble
+  \ifnum\si@num@dp>\thr@@\relax
+    \si@num@dp\thr@@\relax
+  \fi
+  \si@fixdptrue
+  \si@ang@ifnum{#1}
+    {\si@ang@ifnum{#2}
+      {\si@ang@ifnum{#3}
+        {\si@tempdima\z@\relax
+         \renewcommand*{\si@tempa}{+}%
+         \ifx\@empty#1\@empty\else
+           \si@tempdima #1pt\relax
+         \fi
+         \ifdim\si@tempdima<\z@\relax
+           \renewcommand*{\si@tempa}{-}%
+         \fi
+         \ifx\@empty#2\@empty\else
+           \si@tempdima\dimexpr\si@tempdima\si@tempa
+             #2pt/60\relax
+         \fi
+         \ifdim\si@tempdima<\z@\relax
+           \renewcommand*{\si@tempa}{-}%
+         \else
+         \fi
+         \ifx\@empty#3\@empty\else
+           \si@tempdima\dimexpr\si@tempdima\si@tempa
+             #3pt/3600\relax
+         \fi
+         \sisetup{numdecimal=.}%
+         \expandafter\si@ang@typeset\expandafter{%
+           \strip@pt\si@tempdima}{}{}}
+        {\si@ang@notnum{#1}{#2}{#3}}}
+      {\si@ang@notnum{#1}{#2}{#3}}}
+    {\si@ang@notnum{#1}{#2}{#3}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@ang@dectoarc}
+%\begin{macro}{\si@ang@arcdeg}
+%\begin{macro}{\si@ang@arcmin}
+%\begin{macro}{\si@ang@arcsec}
+% The conversion macros for decimal to arc angles.  Life is more
+% complex here than above, even without the need for checks on the
+% input.  A number of separation steps are needed, each of which
+% needs a separate macro.\\
+%\cs{si@ang@dectoarc}\marg{angle}
+%    \begin{macrocode}
+\newcommand*{\si@ang@dectoarc}[1]{%
+  \let\si@ang@fix\si@ang@arcfix
+  \si@ang@fixdptrue
+  \ifnum\si@num@dp>\@ne\relax
+    \si@num@dp\@ne\relax
+  \fi
+  \si@ang@ifnum{#1}
+    {\si@tempdima\z@\relax
+     \ifx\@empty#1\@empty\else
+       \si@tempdima #1pt\relax
+     \fi
+     \si@ang@sepint{deg}%
+     \si@tempdima\dimexpr\si@tempdima *60\relax
+     \si@ang@sepint{min}%
+     \edef\si@tempa{\the\dimexpr\si@tempdima *60\relax}%
+     \expandafter\newcommand\expandafter*\expandafter{%
+       \expandafter\si@ang@arcsec\expandafter}\expandafter{%
+       \expandafter\si@ang@strippt\si@tempa}%
+%    \end{macrocode}
+% A check is made for ``0.0'' seconds, which should be converted to
+% simply ``0''.
+%    \begin{macrocode}
+     \si@tempdima\z@\relax
+     \edef\si@tempa{\the\si@tempdima}%
+     \expandafter\renewcommand\expandafter*\expandafter{%
+       \expandafter\si@tempa\expandafter}\expandafter{%
+       \expandafter\si@ang@strippt\si@tempa}%
+     \ifx\si@tempa\si@ang@arcsec
+       \renewcommand*{\si@ang@arcsec}{0}%
+     \fi
+%    \end{macrocode}
+% To avoid adding zeros where they are not required, each part of the
+% angle is now checked.
+%    \begin{macrocode}
+     \renewcommand*{\si@tempa}{0}%
+     \ifx\si@ang@arcdeg\si@tempa
+       \si@temptoks{{}}%
+     \else
+       \si@temptoks{{\si@ang@arcdeg}}%
+     \fi
+     \ifx\si@ang@arcmin\si@tempa
+       \si@temptoks\expandafter{\the\si@temptoks{}}%
+     \else
+       \si@temptoks\expandafter{\the\si@temptoks{%
+         \si@ang@arcmin}}%
+     \fi
+     \ifx\si@ang@arcsec\si@tempa
+       \si@temptoks\expandafter{\the\si@temptoks{}}%
+     \else
+       \si@temptoks\expandafter{\the\si@temptoks{%
+         \si@ang@arcsec}}%
+     \fi
+     \expandafter\si@ang@typeset\the\si@temptoks}
+    {\si@ang@notnum{#1}{}{}}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@ang@sepint}
+%\begin{macro}{\si@ang@sint}
+%\begin{macro}{\si@ang@strippt}
+% Support macros for the conversion from decimal to arc angles.\\
+%\cs{si@ang@sepint}\marg{deg/min}\\
+%\cs{si@ang@sint}\meta{chars}.\meta{chars}\cs{@empty}\\
+%\cs{si@ang@strippt}\meta{chars}\texttt{pt}
+%    \begin{macrocode}
+\newcommand*{\si@ang@sepint}[1]{%
+  \expandafter\si@ang@sint\the\si@tempdima\@empty
+  \expandafter\let\csname si@ang@arc#1\endcsname\si@tempa}
+\def\si@ang@sint#1.#2\@empty{%
+  \renewcommand*{\si@tempa}{#1}%
+  \si@tempdima 0.#2\relax}
+\begingroup
+  \catcode`P=12
+  \catcode`T=12
+  \lowercase{
+    \renewcommand*{\si@tempa}{%
+      \def\si@ang@strippt##1PT{##1}}}
+  \expandafter\endgroup
+\si@tempa
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@ang@notnum}
+% Not a \TeX\ number: complain.\\
+%\cs{si@ang@notnum}\marg{dec}\marg{min}\marg{sec}
+%    \begin{macrocode}
+\newcommand*{\si@ang@notnum}[3]{%
+  \si@log@warn{Angle `#1;#2;#3' is not a pure
+    number:\MessageBreak output will be as given}%
+  \si@ang@typeset{#1}{#2}{#3}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@ang@sign}
+% A flag is needed to leave signs along for angles, where
+% a zero value may still need a sign.
+%    \begin{macrocode}
+\newif\ifsi@ang@sign
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@ang@typeset}
+% The \cs{si@ang@set} macro does the work of assigning the degrees,
+% minutes and seconds, and actually typesetting the result.\\
+%\cs{si@ang@typeset}\marg{num}\marg{num}\marg{num}
+%    \begin{macrocode}
+\newcommand*{\si@ang@typeset}[3]{%
+%    \end{macrocode}
+%\begin{macro}{\si@ang@degs}
+%\begin{macro}{\si@ang@mins}
+%\begin{macro}{\si@ang@secs}
+% First, the three macros that will contain the measures must exist.
+%    \begin{macrocode}
+  \ifsi@ang@padlarge
+    \newcommand*{\si@ang@degs}{0\si@sym@degree}%
+    \newcommand*{\si@ang@mins}{0\si@sym@minute}%
+    \newcommand*{\si@ang@secs}{0\si@sym@second}%
+  \else
+    \newcommand*{\si@ang@degs}{}%
+    \newcommand*{\si@ang@mins}{}%
+    \newcommand*{\si@ang@secs}{}%
+  \fi
+  \protected@edef\si@ang@decimalsymbol{\si@decimalsymbol}%
+%    \end{macrocode}
+%\begin{macro}{\si@ang@movesign}
+% Either the signs need to be moved, or this needs to be killed off.
+%    \begin{macrocode}
+  \ifsi@astroang
+    \let\si@ang@movesign\si@ang@astrosign
+  \else
+    \let\si@ang@movesign\@gobble
+  \fi
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@ang@secnum}
+%\begin{macro}{\si@ang@minnum}
+% The arguments are now examined in reverse order.  If they are
+% empty, then nothing is done.  Otherwise, the larger measures are
+% zero-filled, if this has been requested. Some steps are needed
+% to allow for addition of signs to numbers.
+%    \begin{macrocode}
+  \newcommand*{\si@ang@secnum}{\si@ang@num{second}}%
+  \newcommand*{\si@ang@minnum}{\si@ang@num{minute}}%
+   \si@ifnotmtarg{#3}
+     {\si@log@debug{Found seconds `#3'}%
+      \si@ang@ifnum{#3}
+        {\ifdim #3 pt=\z@\relax\else
+           \si@ang@signtrue
+         \fi}{}%
+      \renewcommand*{\si@ang@secs}
+       {\si@ang@secnum{#3}\si@sym@second}%
+      \renewcommand*{\si@ang@mins}
+        {\si@ang@pad{0\si@sym@minute}}%
+      \renewcommand*{\si@ang@degs}
+        {\si@ang@pad{0\si@sym@degree}}}%
+   \si@ifnotmtarg{#2}
+     {\si@log@debug{Found minutes `#2'}%
+      \si@ang@ifnum{#2}
+        {\ifdim #2 pt=\z@\relax\else
+           \si@ang@signtrue
+         \fi}{}%
+      \renewcommand*{\si@ang@secnum}{%
+        \si@ang@signlessnum{second}}%
+      \renewcommand*{\si@ang@mins}
+       {\si@ang@minnum{#2}\si@sym@minute}%
+      \renewcommand*{\si@ang@degs}
+        {\si@ang@pad{0\si@sym@degree}}}%
+   \si@ifnotmtarg{#1}
+     {\si@log@debug{Found degrees `#1'}%
+      \renewcommand*{\si@ang@secnum}{%
+        \si@ang@signlessnum{second}}%
+      \renewcommand*{\si@ang@minnum}{%
+        \si@ang@signlessnum{minute}}%
+      \renewcommand*{\si@ang@degs}
+%    \end{macrocode}
+% The group here is needed to get the mechanism to move the symbol to
+% work properly.
+%    \begin{macrocode}
+       {\si@ang@num{degree}{#1}%
+        \si@sym@degree}}%
+   \si@out@num
+     {\si@ang@degs\si@anglesep\si@ang@mins\si@anglesep
+        \si@ang@secs}%
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+% The group opened by \cs{ang} is closed.
+%    \begin{macrocode}
+   \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@ang@pad}
+% Padding is only added if requested; the zero is a literal.\\
+%\cs{si@ang@pad}\marg{num}
+%    \begin{macrocode}
+\newcommand*{\si@ang@pad}[1]{\ifsi@ang@padsmall #1\fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@ang@num}
+%\begin{macro}{\si@ang@signlessnum}
+% Modified versions of \cs{num}, one to typeset angles without a
+% leading sign and the other with.\\
+%\cs{si@ang@num}\marg{degree/minute/second}\marg{num}\\
+%\cs{si@ang@signlessnum}\marg{degree/minute/second}\marg{num}
+%    \begin{macrocode}
+\newcommand*{\si@ang@num}[2]{%
+  \begingroup
+    \si@ang@fix{#1}%
+    \si@ang@movesign{#1}%
+    \si@num{#2}%
+  \endgroup}
+\newcommand*{\si@ang@signlessnum}[2]{%
+  \begingroup
+    \si@ang@fix{#1}%
+    \si@ang@movesign{#1}%
+    \sisetup{addsign=none}%
+    \si@num{#2}%
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@ang@killdegree}
+%\begin{macro}{\si@ang@killminute}
+%\begin{macro}{\si@ang@killsecond}
+%\begin{macro}{\si@ang@astrosign}
+%\begin{macro}{\si@ang@decimalsymbol}
+% A mechanism is needed to handle moving the angle unit signs for the
+% \opt{astroang} option.  This requires two steps, producing the sign
+% over the decimal sign and preventing duplicate symbols appearing.
+% This is based on a suggestion from Morten H{\o}gholm, but using
+% \TeX\ internals as \cs{makebox} does not work here.  Note the need
+% to correct for \cs{scriptspace} (thanks to Donald Arseneau for
+% that).\\
+%\cs{si@ang@astrosign}\marg{degree/minute/second}
+%    \begin{macrocode}
+\newcommand*{\si@ang@killdegree}{\let\si@sym@degree\relax}
+\newcommand*{\si@ang@killminute}{\let\si@sym@minute\relax}
+\newcommand*{\si@ang@killsecond}{\let\si@sym@second\relax}
+\newcommand*{\si@ang@astrosign}[1]{%
+  \renewcommand*{\si@decimalsymbol}{%
+    \setbox\si@tempboxa=\hbox{%
+      \ensuremath{{\si@ang@decimalsymbol}}}%
+    \si@tempdima\wd\si@tempboxa\relax
+    \setbox\si@tempboxb=\hbox to\z@{%
+      \hss\unhbox\si@tempboxa\hss}%
+    \setbox\si@tempboxa=\hbox{%
+      \csname si@sym@#1\endcsname\hskip-\scriptspace}%
+    \si@tempdimb\wd\si@tempboxa\relax
+    \setbox\si@tempboxc=\hbox to\z@{%
+      \hss\unhbox\si@tempboxa\hss}%
+    \setbox\si@tempboxd=\hbox{%
+      \usebox\si@tempboxb\usebox\si@tempboxc}%
+    \ifdim\si@tempdima>\si@tempdimb\relax
+      \setbox\si@tempboxa=\hbox to\si@tempdima{%
+        \hss\unhbox\si@tempboxd\hss}%
+    \else
+      \setbox\si@tempboxa=\hbox to\si@tempdimb{%
+        \hss\unhbox\si@tempboxd\hss}%
+    \fi
+    \usebox\si@tempboxa%
+    \ifdim\si@tempdima>\si@tempdimb\relax\else
+      \hskip\scriptspace
+    \fi}%
+  \renewcommand*{\si@num@decimalhook}{\expandafter\aftergroup
+    \csname si@ang@kill#1\endcsname}}%
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%
+%\subsection{Tabular material}
+% The automatic formatting and alignment of numerical data in columns
+% is handled here.  The various other packages that work in this area
+% are basically ripped-off here.  The letters |D|, |N| and |R| are
+% already taken by the other packages for numerical alignment, and so
+% |S| ($=$ \currpkg) is chosen for the alignment of numerical
+% material.  The package also provides a second column type, |s|, for
+% units (the letter is taken from \cs{si}).
+%
+%\begin{macro}{\NC@list}
+% The first part of the job is to create the basic apparatus for the
+% columns using the \pkg{array} package.  To prevent any issues with
+% the content of optional arguments to the new columns, so
+% rearrangement is needed.  The \currpkg columns have to come
+% \emph{before} any other column definitions.  This is achieved by
+% saving \cs{NC@list}, creating the columns then restoring the list
+% with the appropriate extra parts.
+%    \begin{macrocode}
+\edef\si@tempa{%
+  \noexpand\NC@do S\noexpand\NC@do s\the\NC@list}
+\newcolumntype{S}{}
+\newcolumntype{s}{}
+\NC@list\expandafter{\si@tempa}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\NC@rewrite@S}
+%\begin{macro}{\NC@rewrite@s}
+% Following the \numprint approach, the \cs{NC@rewrite@\ldots} macros
+% are rewritten to collect the cell contents.  This means messing
+% with the internal macros of another package, but there is no other
+% way to do this.  As \pkg{array} is a standard package from the
+% \pkg{tools} bundle, this should be reasonably safe. Here the begin
+% and end code needed is added to the existing list if
+% \cs{@temptokena}, with the start and end macros unexpanded.
+% Argument |#1| contains any user setup options for this column.
+% Passing an argument at this stage will cause issues, so each column
+% type needs its own \texttt{begin} and \texttt{end} macros.\\
+%\cs{NC@rewrite@S}\oarg{options}
+%\cs{NC@rewrite@s}\oarg{options}
+%    \begin{macrocode}
+\renewcommand*{\NC@rewrite@S}[1][]{%
+  \edef\si@tempa{\the\@temptokena
+    >{\noexpand\si@tab@begin@S[#1]}c%
+    <{\noexpand\si@tab@end@S}}%
+  \@temptokena\expandafter{\si@tempa}%
+  \NC@find}
+\renewcommand*{\NC@rewrite@s}[1][]{%
+  \edef\si@tempa{\the\@temptokena
+    >{\noexpand\si@tab@begin@s[#1]}c%
+    <{\noexpand\si@tab@end@s}}%
+  \@temptokena\expandafter{\si@tempa}%
+  \NC@find}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@tab@begin@S}
+%\begin{macro}{\si@tab@begin@s}
+%\begin{macro}{\si@tab@gettok}
+% At this stage, the appropriate token gathering macro is activated,
+% and the common starting macro is called.  For the |S| column, the
+% \opt{seperr} is turned off, and an error is set to be raised by any
+% ``x-part'' input.\\
+%\cs{si@tab@begin@S}\oarg{options}\\
+%\cs{si@tab@begin@s}\oarg{options}
+%    \begin{macrocode}
+\newcommand*{\si@tab@begin@S}[1][]{%
+  \si@log@debug{Processing S column cell contents}%
+  \let\si@tab@gettok\si@tab@gettok@S
+  \si@seperrfalse
+  \renewcommand*{\si@num@sepxpart}{%
+    \si@log@err{Multiple numbers not allowed in
+       tables\MessageBreak Only the first number used}
+       \@ehb}%
+  \si@tab@begin[#1]}
+\newcommand*{\si@tab@begin@s}[1][]{%
+  \si@log@debug{Processing s column cell contents}%
+  \let\si@tab@gettok\si@tab@gettok@s
+  \si@tab@begin[#1]}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@tab@toks}
+%\begin{macro}{\si@tab@pretoks}
+%\begin{macro}{\si@tab@posttoks}
+% Some storage is needed for the data to build up.  In common with
+% \pkg{rccol} and \numprint, token registers are used for this (thus
+% leaving problematic input to be handled later).
+%    \begin{macrocode}
+\newtoks\si@tab@toks
+\newtoks\si@tab@pretoks
+\newtoks\si@tab@posttoks
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@tab@begin}
+% The macro for gathering up input is common to both column types. It
+% uses the method for \pkg{rccol}; the cell contents are collected by
+% a second macro, which then stores all of the data in an appropriate
+% token store.\\
+%\cs{si@tab@begin}\oarg{options}
+%    \begin{macrocode}
+\newcommand*{\si@tab@begin}[1][]{%
+  \begingroup
+    \sisetup{#1}%
+    \si@tab@toks{}%
+    \si@tab@pretoks{}%
+    \si@tab@posttoks{}%
+    \si@switchfalse
+    \si@tab@gettok}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@tab@gettok@S}
+%\begin{macro}{\si@tab@othertok}
+%\begin{macro}{\si@tab@gettok@s}
+%\begin{macro}{\si@tab@next}
+% The two collection macros are very similar.  Both compare the
+% current input with a list of possible fixed values; this is pretty
+% much a direct copy of \numprint.  If the input is not on the list
+% of choices, it is processed as data for \currpkg to handle.  The
+% |S| column does an additional check, to allow division of a number
+% from any text.  For the |s| column, everything gets added to
+% \cs{si@tab@toks} for later processing.  Two separate macros are
+% needed here as the fixed values are dependant on the column type,
+% and awkward errors pop up if a combined approach is tried.\\
+%\cs{si@tab@gettok@S}\marg{cell-contents}\\
+%\cs{si@tab@othertok}\marg{chars}\\
+%\cs{si@tab@gettok@s}\marg{cell-contents}
+%    \begin{macrocode}
+\newcommand*{\si@tab@gettok@S}[1]{%
+  \ifx\tabularnewline#1\relax
+    \let\si@tab@next\si@tab@newline@S
+  \else
+    \ifx\end#1\relax
+      \let\si@tab@next\end
+    \else
+      \ifx\si@tab@end@S#1\relax
+        \let\si@tab@next\si@tab@end@S
+      \else
+        \ifx\endtabular#1\relax
+          \let\si@tab@next\endtabular
+        \else
+          \ifx\csname#1\relax
+            \let\si@tab@next\csname
+          \else
+            \ifx\relax#1\relax
+              \let\si@tab@next\relax
+            \else
+              \let\si@tab@next\si@tab@gettok@S
+              \si@str@ifchrstr{#1}{\si@numvalid}
+                {\si@switchtrue
+                 \si@log@debug{Found numerical cell
+                   contents `#1'}%
+                 \si@tab@toks=\expandafter{%
+                   \the\si@tab@toks#1}}
+                {\si@log@debug{Found other cell contents
+                   \string#1}%
+                 \si@tab@othertok{#1}}%
+            \fi
+          \fi
+        \fi
+      \fi
+    \fi
+  \fi
+  \si@tab@next}
+\newcommand*{\si@tab@othertok}[1]{%
+  \ifsi@switch
+    \si@tab@posttoks=\expandafter{\the\si@tab@posttoks#1}%
+  \else
+    \si@tab@pretoks=\expandafter{\the\si@tab@pretoks#1}%
+  \fi}
+\newcommand*{\si@tab@gettok@s}[1]{%
+  \ifx\tabularnewline#1\relax
+    \let\si@tab@next\si@tab@newline@s
+  \else
+    \ifx\end#1\relax
+      \let\si@tab@next\end
+    \else
+      \ifx\si@tab@end@s#1\relax
+        \let\si@tab@next\si@tab@end@s
+      \else
+        \ifx\endtabular#1\relax
+          \let\si@tab@next\endtabular
+        \else
+          \ifx\csname#1\relax
+            \let\si@tab@next\csname
+          \else
+            \ifx\relax#1\relax
+              \let\si@tab@next\relax
+            \else
+              \let\si@tab@next\si@tab@gettok@s
+                  \si@tab@toks=\expandafter{%
+                    \the\si@tab@toks#1}%
+                  \si@log@debug{Found cell contents `#1'}%
+            \fi
+          \fi
+        \fi
+      \fi
+    \fi
+  \fi
+  \si@tab@next}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@tab@end@S}
+%\begin{macro}{\si@tab@rfill}
+%\begin{macro}{\si@tab@lfill}
+%\begin{macro}{\si@tab@end@s}
+% The end macros are similar, but with some minor differences. In
+% both cases, the appropriate filling is carried out.  For the |S|
+% column, this depends on the cell contents, whereas for the |s|
+% column the fill is always the same.  Output of a number in an |S|
+% column is only attempted if one was found, otherwise the cell
+% contents will all be in \cs{si@tab@pretoks}.
+%    \begin{macrocode}
+\newcommand*{\si@tab@end@S}{%
+    \ifsi@switch
+      \let\si@tab@lfill\si@tab@lfill@S
+      \let\si@tab@rfill\si@tab@rfill@S
+    \else
+      \let\si@tab@rfill\si@tab@rfill@t
+      \let\si@tab@lfill\si@tab@lfill@t
+    \fi
+    \si@tab@lfill\relax
+    \the\si@tab@pretoks
+    \ifsi@switch
+      \expandafter\si@tab@numout
+    \fi
+    \the\si@tab@posttoks
+    \si@tab@rfill\relax
+  \endgroup}
+\newcommand*{\si@tab@end@s}{%
+    \si@tab@lfill@s\relax
+    \expandafter\si\expandafter{\the\si@tab@toks}%
+    \si@tab@rfill@s\relax
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@tab@newline@S}
+%\begin{macro}{\si@tab@newline@s}
+%\begin{macro}{\si@tab@end}
+% If the column is the final one read, then some work is needed with
+% the \cs{tabularnewline} macro.  Output has to happen \emph{before}
+% the new line, then the ending macro is made safe before calling the
+% \LaTeX\ line end.  If the user makes use of the primitive \cs{cr}
+% then this problem does not arise as \cs{si@tab@end@\ldots} is
+% called correctly.
+%    \begin{macrocode}
+\newcommand*{\si@tab@newline@S}{%
+  \si@tab@end@S
+  \hfil\relax
+  \let\si@tab@end\si@tab@end@S
+  \renewcommand*{\si@tab@end@S}{\let\si@tab@end@S\si@tab@end}%
+  \tabularnewline}
+\newcommand*{\si@tab@newline@s}{%
+  \si@tab@end@s
+  \hfil\relax
+  \let\si@tab@end\si@tab@end@s
+  \renewcommand*{\si@tab@end@s}{\let\si@tab@end@s\si@tab@end}%
+  \tabularnewline}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%
+%\begin{macro}{\si@tempcnta}
+%\begin{macro}{\si@tempcntb}
+% The second part of the tabular code is concerned with typesetting
+% numbers in |S| columns with the appropriate alignment. Counters are
+% needed for the digit-counting system.
+%    \begin{macrocode}
+\newcount\si@tempcnta
+\newcount\si@tempcntb
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@tab@numout}
+% If a number is found, then some secondary processing is needed to
+% format it correctly.
+%    \begin{macrocode}
+\newcommand*{\si@tab@numout}{%
+  \si@num@intabtrue
+  \ifsi@tab@fixed
+    \ifsi@tabautofit
+      \si@num@dp\si@tab@mantpostcnt\relax
+      \expandafter\expandafter\expandafter\si@fixdptrue
+    \fi
+  \fi
+  \expandafter\si@num\expandafter{\the\si@tab@toks}%
+  \si@tab@format}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@tab@prebox}
+%\begin{macro}{\si@tab@postbox}
+%\begin{macro}{\si@tab@midbox}
+%\begin{macro}{\si@tab@expbox}
+% The various boxes needed for the column centring are declared
+% Unlike the \pkg{dcolumn} original, private boxes are used here.
+% \cs{si@tempboxa} is used when a space to measure one of the
+% constituents is needed; it is never used for output.
+%    \begin{macrocode}
+\newbox\si@tab@prebox
+\newbox\si@tab@midbox
+\newbox\si@tab@postbox
+\newbox\si@tab@expbox
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@tab@format}
+% The formatting set up is taken from \pkg{dcolumn}, but with
+% control of the output form the stored information.  The choice
+% of a variable (decimal-centred) column or fixed width boxes is
+% made.
+%    \begin{macrocode}
+\newcommand*{\si@tab@format}{%
+  \ifsi@tab@fixed
+    \expandafter\si@tab@fixed
+  \else
+    \expandafter\si@tab@unfixed
+  \fi
+%    \end{macrocode}
+% A hack to get the correct colour everywhere without too much work.
+%    \begin{macrocode}
+  \ifsi@colourvalues
+    \si@fam@colourcmd{\si@valuecolour}%
+  \fi
+  \box\si@tab@prebox\box\si@tab@midbox\box\si@tab@postbox%
+    \box\si@tab@expbox}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@tab@unfixed}
+% When the width of the contents is not fixed, the system creates a
+% block in which the decimal marker is always at the centre. This is
+% achieved by placing the pre- and post-decimal parts of the number
+% in boxes.  The wider one is then used to set up the column width,
+% by resizing the other one.
+%    \begin{macrocode}
+\newcommand*\si@tab@unfixed{%
+  \si@log@debug{Using variable width S column}%
+  \protected@edef\si@num@out{\si@num@out\si@tab@expout}%
+  \setbox\si@tab@prebox=\hbox
+    {\expandafter\si@out@num\expandafter{\si@tab@out}}%
+  \ifx\@empty\si@num@out\@empty
+    \setbox\si@tab@midbox=\hbox
+      {\phantom{\ensuremath{{\si@decimalsymbol}}}}%
+  \else
+    \setbox\si@tab@midbox=\hbox
+      {\ensuremath{{\si@decimalsymbol}}}%
+  \fi
+  \setbox\si@tab@postbox=\hbox
+    {\expandafter\si@out@num\expandafter{\si@num@out}}%
+  \ifdim\wd\si@tab@prebox>\wd\si@tab@postbox\relax
+    \setbox\si@tab@postbox=\hbox to\wd\si@tab@prebox%
+      {\unhbox\si@tab@postbox\hfill}%
+  \else
+    \setbox\si@tab@prebox=\hbox to\wd\si@tab@postbox%
+      {\hfill\unhbox\si@tab@prebox}%
+  \fi
+  \setbox\si@tab@expbox=\hbox{}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@tab@predim}
+%\begin{macro}{\si@tab@postdim}
+%\begin{macro}{\si@tab@expdim}
+%\begin{macro}{\si@tempdima}
+%\begin{macro}{\si@tempdimb}
+% Some storage dimensions are declared.
+%    \begin{macrocode}
+\newdimen\si@tab@predim
+\newdimen\si@tab@postdim
+\newdimen\si@tab@expdim
+\newdimen\si@tempdima
+\newdimen\si@tempdimb
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@tab@sp}
+% A short macro to control superscript.
+%    \begin{macrocode}
+\newcommand*{\si@tab@sp}{}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@tab@fixed}
+% The column is not centred on the decimal marker; the user specifies
+% how many characters on each side are allowed for.  First, the width
+% of a character is measured, and stored.
+%    \begin{macrocode}
+\newcommand*{\si@tab@fixed}{%
+  \si@log@debug{Using fixed-width S column}%
+  \let\si@tab@sp\relax
+  \setbox\si@tab@midbox=\hbox{}%
+  \setbox\si@tab@expbox=\hbox{}%
+  \setbox\si@tempboxa=\hbox{\si@out@num{1}}%
+  \si@tempdima\wd\si@tempboxa\relax
+%    \end{macrocode}
+% The width for the two output boxes is set up.
+%    \begin{macrocode}
+  \si@tab@predim\the\si@tab@mantprecnt\si@tempdima\relax
+  \si@tab@sepcorr{mantpre}{pre}%
+  \si@tab@postdim\si@tab@mantpostcnt\si@tempdima\relax
+  \setbox\si@tempboxa=\hbox{\ensuremath{{\si@decimalsymbol}}}%
+  \advance\si@tab@postdim\wd\si@tempboxa\relax
+  \si@tab@sepcorr{mantpost}{post}%
+%    \end{macrocode}
+% If space is needed for an exponent, it needs to be allowed for in
+% the exponent box dimension.  First, the digits of the two parts are
+% checked for; the width of a character is altered to be superscript.
+%    \begin{macrocode}
+  \setbox\si@tempboxa=\hbox{\si@out@num{^{1}}}%
+  \si@tempdima\wd\si@tempboxa\relax
+  \ifnum\si@tab@expprecnt>\z@\relax
+    \si@tab@expdim\si@tab@expprecnt\si@tempdima\relax
+    \si@tab@sepcorr{exppre}{exp}%
+  \fi
+  \let\si@tab@sp\sp
+  \ifnum\si@tab@exppostcnt>\z@\relax
+    \advance\si@tab@expdim\si@tab@exppostcnt\si@tempdima\relax
+    \setbox\si@tempboxa=\hbox{%
+      \ensuremath{^{\si@decimalsymbol}}}%
+    \advance\si@tab@expdim\wd\si@tempboxa\relax
+    \si@tab@sepcorr{exppost}{exp}%
+  \fi
+%    \end{macrocode}
+% Space is reserved for signs.
+%    \begin{macrocode}
+  \setbox\si@tempboxa=\hbox{\ensuremath{-}}%
+  \ifsi@tab@mantsign
+    \advance\si@tab@predim\wd\si@tempboxa\relax
+  \fi
+  \setbox\si@tempboxa=\hbox{\ensuremath{^{-}}}%
+  \ifsi@tab@expsign
+    \advance\si@tab@expdim\wd\si@tempboxa\relax
+  \fi
+%    \end{macrocode}
+% Now, if there is space to be saved for an exponent under any
+% circumstances, the space for the ``$\times 10$'' part is needed.
+% This is done by adding both counters together, then using this
+% result for the logic.
+%    \begin{macrocode}
+  \si@tempcnta\si@tab@expprecnt\relax
+  \advance\si@tempcnta\si@tab@exppostcnt\relax
+  \ifnum\si@tempcnta>\z@\relax
+    \setbox\si@tempboxa=\hbox{\ensuremath{%
+      {}\si@expproduct{}\si@expbase}}%
+    \advance\si@tab@expdim\wd\si@tempboxa\relax
+  \fi
+%    \end{macrocode}
+% Finally for the box dimensions, if the exponent is not aligned,
+% the space reserved for it is added to the post box.
+%    \begin{macrocode}
+  \ifsi@tabalignexp\else
+    \advance\si@tab@postdim\si@tab@expdim\relax
+  \fi
+%    \end{macrocode}
+% With the boxes set up, the contents can be sorted out.  A bit of
+% shuffling may be needed, depending on the treatment of exponents.
+%    \begin{macrocode}
+  \setbox\si@tab@prebox=\hbox to\si@tab@predim{\hss\hfill
+    \expandafter\si@out@num\expandafter{\si@tab@out}}%
+  \ifx\@empty\si@num@out\@empty
+    \setbox\si@tab@postbox=\hbox to\si@tab@postdim
+      {\expandafter\si@out@num\expandafter{\si@num@out}\hfil}%
+  \else
+    \ifsi@tabalignexp\else
+      \protected@edef\si@num@out{\si@num@out\si@tab@expout}%
+    \fi
+    \setbox\si@tab@postbox=\hbox to\si@tab@postdim
+      {\ensuremath{{\si@decimalsymbol}}\expandafter\si@out@num
+        \expandafter{\si@num@out}\hfil}%
+  \fi
+  \ifx\@empty\si@tab@expout\@empty
+    \ifsi@tabalignexp
+      \setbox\si@tab@expbox=\hbox to\si@tab@expdim{\hfil}%
+    \fi
+  \else
+    \ifsi@tabalignexp
+      \setbox\si@tab@expbox=\hbox to\si@tab@expdim
+        {\expandafter\si@out@num\expandafter{\si@tab@expout}%
+           \hfil}%
+    \fi
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@tab@sepcorr}
+% A spacing correction is needed \emph{if} the number of digits to be
+% allowed for will lead to the introduction of a separator.  A counter
+% and dimension are needed for the testing.\\
+%\cs{si@tab@sepcorr}\marg{count}\marg{dimen}
+%    \begin{macrocode}
+\newcommand*{\si@tab@sepcorr}[2]{%
+  \expandafter\si@tempcnta\expandafter\the
+    \csname si@tab@#1cnt\endcsname\relax
+%    \end{macrocode}
+% Calculate how many groups of three there are, then allow for not
+% separating four characters if \cs{ifsi@sepfour} is false.
+%    \begin{macrocode}
+  \divide\si@tempcnta\thr@@\relax
+  \ifsi@sepfour\else
+    \expandafter\ifnum\expandafter\the
+      \csname si@tab@#1cnt\endcsname=4\relax
+      \si@tempcnta\z@\relax
+    \fi
+  \fi
+%    \end{macrocode}
+% The width of the separators is measured, and the correct number of
+% separator widths are added to the box dimension.
+%    \begin{macrocode}
+  \setbox\si@tempboxa=\hbox{%
+    \ensuremath{\si@tab@sp{\si@digitsep}}}%
+  \expandafter\advance\csname si@tab@#2dim\endcsname
+    \si@tempcnta\wd\si@tempboxa}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Units}
+%\begin{macro}{\SI}
+%\begin{macro}{\si}
+% There are two types of user macros for the units system; those for
+% defining new units, prefixes and powers, and those for using them.
+% There are two macros for using units, \cs{SI} and \cs{si},
+% which work in very similar ways.  \cs{si} is just an alias for
+% \cs{SI} with no number; everything is handed off into an internal
+% macro.  The internal macro also handles the optional prefix
+% argument to \cs{SI}\\
+%\cs{SI}\oarg{options}\marg{num}
+%\cs{si}\oarg{options}\marg{unit}
+%    \begin{macrocode}
+\si@newrobustcmd*{\SI}[2][]{%
+  \@ifnextchar[%]
+    {\si@SI[#1]{#2}}
+    {\si@SI[#1]{#2}[]}}
+\si@newrobustcmd*{\si}[2][]{\si@SI[#1]{}[]{#2}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\newunit}
+%\begin{macro}{\renewunit}
+%\begin{macro}{\provideunit}
+% The \cs{newunit} and \cs{renewunit} macros create the new unit
+% macros. To allow a mechanism for checking an existing definition,
+% these macros simply carry out the appropriate tests, before handing
+% off to the internal macro.  \cs{@ifdefinable} is not used here as a
+% customised error is desirable. Other than that, the code here gives
+% very similar results to \cs{newcommand} and \cs{renewcommand}.
+% Finally, \cs{provideunit} adds the unit definition only if it does
+% not already exist.\\
+%\cs{newunit}\oarg{options}\marg{unit}\marg{symbol}\\
+%\cs{renewunit}\oarg{options}\marg{unit}\marg{symbol}\\
+%\cs{provideunit}\oarg{options}\marg{unit}\marg{symbol}
+%    \begin{macrocode}
+\newcommand*{\newunit}[3][]{%
+  \si@ifdefinable{#2}
+    {\si@unt@defunit[#1]{#2}{#3}}
+    {\si@log@err{Unit \string#2 already defined!}\@eha}}
+\newcommand*{\renewunit}[3][]{%
+  \si@ifdefinable{#2}
+    {\si@log@err{Unit \string#2 undefined}\@ehc
+     \si@unt@defunit[#1]{#2}{#3}}
+    {\si@log@inf{Redefining unit \string#2}%
+     \si@unt@defunit[#1]{#2}{#3}}}
+\newcommand*{\provideunit}[3][]{%
+  \si@ifdefinable{#2}
+    {\si@unt@defunit[#1]{#2}{#3}}
+    {}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\newprefix}
+%\begin{macro}{\renewprefix}
+%\begin{macro}{\provideprefix}
+% The multiples of units are defined here; very similar code is used
+% to the \cs{newunit}, \etc., macros.  The multiple prefixes cannot take
+% an optional argument, and must represent some power.  Hence the arguments
+% required are different.
+%\cs{newprefix}\oarg{binary}\marg{multiple}\marg{powers-ten}^^A
+%  \marg{symbol}\\
+%\cs{renewprefix}\oarg{binary}\marg{multiple}\marg{powers-ten}^^A
+%  \marg{symbol}\\
+%\cs{provideprefix}\oarg{binary}\marg{multiple}\marg{powers-ten}^^A
+%  \marg{symbol}
+%    \begin{macrocode}
+\newcommand*{\newprefix}[4][]{%
+  \si@ifdefinable{#2}
+    {\si@unt@defprefix[#1]{#2}{#3}{#4}}
+    {\si@log@err{Prefix \string#2 already defined!}\@eha}}
+\newcommand*{\renewprefix}[4][]{%
+  \si@ifdefinable{#2}
+    {\si@log@err{Prefix \string#2 undefined}\@ehc
+     \si@unt@defprefix[#1]{#2}{#3}{#4}}
+    {\si@log@inf{Redefining prefix \string#2}%
+     \si@unt@defprefix[#1]{#2}{#3}{#4}}}
+\newcommand*{\provideprefix}[4][]{%
+  \si@ifdefinable{#2}
+    {\si@unt@defprefix[#1]{#2}{#3}{#4}}
+    {}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\newpower}
+%\begin{macro}{\renewpower}
+%\begin{macro}{\providepower}
+% Here power multiples for units are set up.  As with units and
+% multiples, a layered approach is used to keep things easy to
+% maintain.  The optional argument here is \emph{not} a \pkg{keyval}
+% one: only \opt{post} is a valid value.\\
+%\cs{newpower}\oarg{post}\marg{num}\marg{power}\\
+%\cs{renewpower}\oarg{post}\marg{num}\marg{power}\\
+%\cs{providepower}\oarg{post}\marg{num}\marg{power}
+%    \begin{macrocode}
+\newcommand*{\newpower}[3][]{%
+  \si@ifdefinable{#2}
+    {\si@unt@defpower[#1]{#2}{#3}}
+    {\si@log@err{Power \string#2 already defined!}\@eha}}
+\newcommand*{\renewpower}[3][]{%
+  \si@ifdefinable{#2}
+    {\si@log@err{Power \string#2 undefined}\@ehc
+     \si@unt@defpower[#1]{#2}{#3}}
+    {\si@log@inf{Redefining power \string#2}%
+     \si@unt@defpower[#1]{#2}{#3}}}
+\newcommand*{\providepower}[3][]{%
+  \si@ifdefinable{#2}
+    {\si@unt@defpower[#1]{#2}{#3}}
+    {}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@unt@num}
+% A flag is needed to tell the processor whether there is a number,
+% to get the correct spacing.
+%    \begin{macrocode}
+\newif\ifsi@unt@num
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@unitarg}
+% A storage macro for the argument of the unit macro.
+%    \begin{macrocode}
+\newcommand*{\si@unt@unitarg}{}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@SI}
+%\begin{macro}{\si@unt@SIopts}
+% The internal processing starts with \cs{si@SI}, which processes the
+% second optional argument to \cs{SI} (which is empty for
+% \cs{si}).  Everything is set up in a group, and processing
+% begins by handling the options.\\
+%\cs{si@SI}\oarg{options}\marg{unit}\oarg{preunit}\marg{unit}
+%    \begin{macrocode}
+\newcommand*{\si@unt@SIopts}{}
+\def\si@SI[#1]#2[#3]#4{%
+  \begingroup
+    \si@ifnotmtarg{#1}
+      {\sisetup{#1}%
+       \renewcommand*{\si@unt@SIopts}{#1}}%
+%    \end{macrocode}
+%\end{macro}
+% The prefix unit is handled before any processing of the number; the
+% flags are set to get spacing correct.
+%    \begin{macrocode}
+    \si@unt@numfalse
+    \si@xspacefalse
+    \si@ifnotmtarg{#3}
+      {\si@log@debug{Prefix unit found}%
+       \si@unt@printunit{#3}}%
+%    \end{macrocode}
+% The numerical argument may be empty, in which case no extra space
+% should be produced.
+%    \begin{macrocode}
+    \si@ifnotmtarg{#4}
+      {\renewcommand*{\si@unt@unitarg}{#4}}%
+    \si@ifnotmtarg{#2}
+      {\si@log@debug{Number found in \string\SI\space
+         argument}%
+       \ifsi@repeatunits\else
+         \ifsi@trapambigerr
+           \expandafter\expandafter\expandafter
+             \si@num@ambigerrtrue
+         \fi
+       \fi
+       \num{#2}%
+       \si@unt@numtrue}%
+%    \end{macrocode}
+% If there is a unit, a check is needed in case the units need to
+% have a power added.
+%    \begin{macrocode}
+    \si@ifnotmtarg{#4}
+      {\si@ifmtarg{#2}
+         {\si@unt@printunit{#4}}
+         {\si@tempcnta\z@\relax
+         \ifsi@addunitpower
+           \si@unt@countx{#2}%
+         \fi
+          \ifnum\si@tempcnta>\z@\relax
+            \advance\si@tempcnta\@ne\relax
+            \edef\si@tempa{\noexpand\tothe{\si@tempcnta}}%
+            \renewcommand*{\si@tempb}{#4}%
+            \expandafter\expandafter\expandafter
+            \si@unt@printunit\expandafter\expandafter
+            \expandafter{%
+              \expandafter\si@tempb\si@tempa}%
+          \else
+            \si@unt@printunit{#4}%
+          \fi}}%
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@countx}
+% A short macro to count up any multiplication in numerical input.
+%    \begin{macrocode}
+\newcommand*{\si@unt@countx}[1]{%
+  \si@tempcnta\z@\relax
+  \expandafter\si@unt@cntx#1\@empty\@empty}
+\def\si@unt@cntx#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@numprod}
+    {\advance\si@tempcnta\@ne\relax}
+    {}%
+  \ifx\@empty#2\@empty\else
+    \si@unt@cntx#2\@empty\@empty
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@ifliteral}
+%\begin{macro}{\ifsi@unt@littest}
+% The next stage of the processor is to determine whether or not the
+% argument of the unit macro is processable.  For literal arguments,
+% this is not the case, and the argument is typeset ``as is''.  On
+% the other hand, any units, \etc., declared by the package will work
+% with the processor, and so need to be executed before typesetting
+% the result.\\
+%\cs{si@unt@ifliteral}\marg{text}
+%    \begin{macrocode}
+\newif\ifsi@unt@littest
+\newcommand*{\si@unt@ifliteral}[1]{%
+  \begingroup
+    \si@unt@littesttrue
+%    \end{macrocode}
+% The test relies on any non-processable test having some width;
+% hopefully, this should be the case.
+%    \begin{macrocode}
+    \setbox\si@tempboxa=\hbox{\si@unt@out{#1}}%
+    \ifdim\wd\si@tempboxa>\z@\relax
+      \aftergroup\@firstoftwo
+    \else
+      \aftergroup\@secondoftwo
+    \fi
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ifsi@unt@litout}
+%\begin{macro}{\si@unt@printunit}
+% The printing macro uses the above test to determine how to act.  It
+% then carries out the appropriate action: either typesetting or
+% executing.  A flag is also provided so that any macro units inside
+% a partially-literal argument will work (this is also needed to
+% emulate \unitsdef).\\
+%\cs{si@unt@printunit}\marg{unit}
+%    \begin{macrocode}
+\newif\ifsi@unt@litout
+\newcommand*{\si@unt@printunit}[1]{%
+  \si@unt@ifliteral{#1}
+%    \end{macrocode}
+% The unit includes one or more literal items; typeset using the
+% unit typesetting macro.
+%    \begin{macrocode}
+    {\si@log@debug{Literal items found in unit
+      argument:\MessageBreak outputting without further
+      processing}%
+     \si@unt@litouttrue
+     \si@unt@addvaluesep
+     \si@unt@out{#1}}
+%    \end{macrocode}
+% For processable output, the argument is executed; the macros are
+% all designed for this.
+%    \begin{macrocode}
+    {\si@log@debug{Macro unit found:\MessageBreak
+       processing to format output}%
+     \si@unt@init
+     \advance\si@unt@depthcnt\@ne\relax
+     #1%
+     \si@unt@final}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@addvaluesep}
+%\begin{macro}{\si@unt@addvalsep}
+%\begin{macro}{\si@unt@litvalsep}
+%\begin{macro}{\si@unt@stackvalsep}
+% To ensure no problems pop up with expansion, adding the value--unit
+% space is handled by a macro.
+%    \begin{macrocode}
+\newcommand*{\si@unt@addvaluesep}{%
+  \ifsi@unt@num
+    \expandafter\si@unt@addvalsep
+  \fi}
+\newcommand*{\si@unt@addvalsep}{%
+  \ifsi@unt@litout
+    \expandafter\si@unt@litvalsep
+  \else
+    \expandafter\si@unt@stackvalsep
+  \fi}
+\newcommand*{\si@unt@stackvalsep}{%
+  \protected@edef\si@unt@spstack{\si@valuesep}}
+\newcommand*{\si@unt@litvalsep}{%
+  \nobreak\ensuremath{\si@valuesep}\nobreak}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@spstack}
+%\begin{macro}{\si@unt@stacka}
+%\begin{macro}{\si@unt@stackb}
+%\begin{macro}{\si@unt@unitcnta}
+%\begin{macro}{\si@unt@unitcntb}
+%\begin{macro}{\si@unt@depthcnt}
+%\begin{macro}{\ifsi@unt@first}
+%\begin{macro}{\ifsi@unt@first}
+%\begin{macro}{\si@unt@init}
+% The initialisation macro sets up the various switches, and clears
+% the storage areas for the formatted output.  There are two stacks,
+% as when typesetting as fractions, the two parts of the number have
+% to be stored separately.  The depth counter is used to tell when
+% recursion ends in the processor.  The ``first'' switch is needed as
+% the depth counter will not be at one for items processed by
+% \cs{SI}.
+%    \begin{macrocode}
+\newcommand*{\si@unt@spstack}{}
+\newcommand*{\si@unt@stacka}{}
+\newcommand*{\si@unt@stackb}{}
+\newcount\si@unt@unitcnta
+\newcount\si@unt@unitcntb
+\newcount\si@unt@depthcnt
+\newif\ifsi@unt@first
+\si@unt@depthcnt\m@ne\relax
+\newcommand*{\si@unt@init}{%
+  \begingroup
+    \si@unt@litoutfalse
+    \si@unt@litprefixfalse
+    \si@unt@firsttrue
+    \si@unt@perfalse
+    \si@unt@perseenfalse
+    \si@unt@prepowerfalse
+    \si@unt@depthcnt\z@\relax
+    \si@unt@powerdim\z@\relax
+    \si@unt@unitcnta\z@\relax
+    \si@unt@unitcntb\z@\relax
+    \si@unt@prefixcnt\z@\relax
+    \renewcommand*{\si@unt@spstack}{}%
+    \renewcommand*{\si@unt@stacka}{}%
+    \renewcommand*{\si@unt@stackb}{}%
+    \renewcommand*{\si@unt@holdstacka}{}%
+    \renewcommand*{\si@unt@holdstackb}{}%
+    \renewcommand*{\si@unt@lastadda}{space}%
+    \renewcommand*{\si@unt@lastaddb}{space}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@final}
+% The finalisation macro finishes off the output and resets the flags.
+%    \begin{macrocode}
+\newcommand*{\si@unt@final}{%
+    \si@unt@third
+    \si@unt@stackout
+  \endgroup
+  \ifsi@xspace
+    \expandafter\expandafter\expandafter\xspace
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@defunit}
+% The internal macro for defining a unit does not check for
+% redefinition; that is done by the user macros.\\
+%\cs{si@unt@defunit}\oarg{options}\marg{unit}\marg{symbol}
+%    \begin{macrocode}
+\newcommand*{\si@unt@defunit}[3][]{%
+  \si@log@debug{Declaring unit \string#2 with \MessageBreak
+    meaning \string#3}%
+%    \end{macrocode}
+% The optional argument needs to be saved. The macro name is reversed
+% so that life is easier with the expansions here.
+%    \begin{macrocode}
+  \si@ifnotmtarg{#1}
+    {\expandafter\@namedef\expandafter{%
+      \expandafter\@gobble\string#2@opt@unt@si}{#1}}%
+%    \end{macrocode}
+% The unit macro itself is now defined.  The definition simply
+% selects the correct path for the rest of the processing to go down.
+%    \begin{macrocode}
+  \protected\def#2{%
+    \ifsi@allowoptarg
+      \expandafter\si@unt@withopt
+    \else
+      \expandafter\si@unt@noopt
+    \fi
+    {#2}{#3}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@withopt}
+%\begin{macro}{\si@unt@noopt}
+% To allow the correct expansion, the potential optional argument to
+% a unit macro has to come last.  So \cs{@ifnextchar} is needed to
+% detect it and pass data through.  To keep variation down, when the
+% argument is not allowed, the empty |[]| is supplied.\\
+%\cs{si@unt@withopt}\marg{unit}\marg{symbol}\\
+%\cs{si@unt@noopt}\marg{unit}\marg{symbol}
+%    \begin{macrocode}
+\newcommand*{\si@unt@withopt}[2]{%
+  \@ifnextchar[%]
+    {\si@unt@opt{#1}{#2}}
+    {\si@unt@opt{#1}{#2}[]}}
+\newcommand*{\si@unt@noopt}[2]{\si@unt@opt{#1}{#2}[]}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@opt}
+% The optional argument to the unit macro (if present) is converted
+% to a normal one for ease.  The correct route for processing is then
+% picked.\\
+%\cs{si@unt@opt}\marg{unit}\marg{symbol}\oarg{num}
+%    \begin{macrocode}
+\def\si@unt@opt#1#2[#3]{%
+  \ifsi@unt@littest
+    \expandafter\si@gobblethree
+  \else
+%    \end{macrocode}
+% For literal output, the second argument is all that is needed.
+%    \begin{macrocode}
+    \ifsi@unt@litout
+      \expandafter\expandafter\expandafter\@gobbletwo
+    \else
+      \expandafter\expandafter\expandafter\si@unt@unit
+    \fi
+  \fi
+  {#3}{#1}{#2}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@gobblethree}
+% \LaTeX\ does not have a \cs{@gobblethree} macro, but one is needed.
+%    \begin{macrocode}
+\long\def\si@gobblethree #1#2#3{}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@defprefix}
+%\begin{macro}{\ifsi@unt@litprefix}
+% As with units, multiples are defined by an internal macro.\\
+%\cs{si@unt@defprefix}\oarg{binary}\marg{multiple}\marg{powers-ten}^^A
+%  \marg{symbol}
+%    \begin{macrocode}
+\newif\ifsi@unt@litprefix
+\si@unt@litprefixtrue
+\newcommand*{\si@unt@defprefix}[4][]{%
+  \si@log@debug{Declaring multiple \string#1 with\MessageBreak
+    meaning \string#4}%
+%    \end{macrocode}
+% The optional argument is saved, using \cs{def} as no check is made
+% on an existing definition of the storage macro.
+%    \begin{macrocode}
+  \expandafter\expandafter\expandafter\def\expandafter
+    \csname\expandafter\@gobble\string#2@opt@si\endcsname{#1}%
+  \protected\def#2{%
+    \ifsi@unt@littest
+      \expandafter\si@gobblethree
+    \else
+      \ifsi@unt@litout
+        \expandafter\expandafter\expandafter\@gobbletwo
+      \else
+        \ifsi@unt@litprefix
+          \expandafter\expandafter\expandafter\expandafter
+            \expandafter\expandafter\expandafter\@gobbletwo
+        \else
+          \expandafter\expandafter\expandafter\expandafter
+            \expandafter\expandafter\expandafter\si@unt@prefix
+        \fi
+      \fi
+    \fi
+    {#2}{#3}{#4}}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@defpower}
+% The definition of powers is complicated by the need to handle both
+% those given before units (such as \cs{cubic}) and those given after
+% (\eg~\cs{cubed}).  This means that an optional argument is
+% needed.\\
+%\cs{si@unt@defpower}\oarg{post}\marg{power}\marg{num}
+%    \begin{macrocode}
+\newcommand*{\si@unt@defpower}[3][]{%
+  \si@log@debug{Declaring power \string#2 with\MessageBreak
+    meaning \string#3}%
+%    \end{macrocode}
+% Once again the optional argument is saved.
+%    \begin{macrocode}
+  \expandafter\expandafter\expandafter\def\expandafter
+    \csname\expandafter\@gobble\string#2@opt@si\endcsname{#1}%
+  \protected\def#2{%
+    \ifsi@unt@littest
+      \expandafter\@gobbletwo
+    \else
+%    \end{macrocode}
+% The literal output here does not need to gobble anything.
+%    \begin{macrocode}
+      \ifsi@unt@litout
+        \expandafter\expandafter\expandafter\si@unt@litpower
+      \else
+        \expandafter\expandafter\expandafter\si@unt@power
+      \fi
+    \fi
+    {#2}{#3}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@unithook}
+%\begin{macro}{\si@unt@unit}
+% The macro for units is actually a processor, rather than
+% typesetting anything, which is handled elsewhere.  The first
+% argument to the macro is optional, but does not have square
+% brackets to keep things simple with gobbling.\\
+%\cs{si@unt@unit}\marg{num}\marg{unit}\marg{symbol}
+%    \begin{macrocode}
+\newcommand*{\si@unt@unithook}{}
+\newcommand*{\si@unt@unit}[3]{%
+%    \end{macrocode}
+% When the count is minus one at the start of the processor, then the
+% unit is begin used on its own: initialisation occurs.
+%    \begin{macrocode}
+  \ifnum\si@unt@depthcnt=\m@ne\relax
+    \expandafter\si@unt@init
+  \fi
+  \advance\si@unt@depthcnt\@ne\relax
+  \si@log@debug{Unit processing: level \the\si@unt@depthcnt,
+    \MessageBreak unit \string#2}%
+  \si@unt@firstorsecond{#1}{#2}%
+%    \end{macrocode}
+% The core of the \cs{si@unt@unit} macro is testing if the symbol for
+% the unit is a literal value or another macro.  Depending on the
+% result, the symbol is either used as a literal or executed.
+%    \begin{macrocode}
+  \si@unt@ifliteral{#3}
+    {\si@unt@addtostack{unit}{#3}%
+     \ifsi@unt@prepower
+       \expandafter\si@unt@stkpower
+     \fi}
+    {#3}%
+%    \end{macrocode}
+% The counter is now stepped down, before checking if this is
+% the end of a compound unit.
+%    \begin{macrocode}
+  \advance\si@unt@depthcnt\m@ne\relax
+  \ifnum\si@unt@depthcnt=\z@\relax
+    \expandafter\si@unt@final
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@firstorsecond}
+% At this stage, the flag will be set for the first item to be
+% processed whichever route the unit has been called by.\\
+%\cs{si@unt@firstorsecond}\marg{num}\marg{macro}
+%    \begin{macrocode}
+\newcommand*{\si@unt@firstorsecond}[2]{%
+  \ifsi@unt@first
+    \expandafter\si@unt@first
+  \else
+    \expandafter\si@unt@second
+  \fi
+  {#1}{#2}}%
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@first}
+% For the first unit in the input, some extra tasks are needed.
+% First, the optional argument for the unit macro needs to be
+% tested.\\
+%\cs{si@unt@first}\marg{num}\marg{unit}
+%    \begin{macrocode}
+\newcommand*{\si@unt@first}[2]{%
+  \si@ifnotmtarg{#1}
+    {\num{#1}%
+     \si@unt@numtrue}%
+  \si@unt@unithook
+%    \end{macrocode}
+% To avoid filling up the macro list with useless values, the \eTeX\
+% primitive \cs{ifcsname} is employed here (it also avoids complex
+% expansion issues).  If some options exist, they are set.
+%    \begin{macrocode}
+  \ifcsname\expandafter\@gobble\string#2@opt@unt@si\endcsname
+    \expandafter\si@unt@setopts
+  \else
+    \expandafter\@gobble
+  \fi
+  {#2}%
+  \si@unt@addvaluesep
+  \si@unt@firstfalse}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@setopts}
+%\begin{macro}{\si@unt@setSIopts}
+% A rather long set of \cs{expandafter} commands to get the options
+% to set safely.\\
+%\cs{si@unt@setopts}\marg{unit}
+%    \begin{macrocode}
+\newcommand*{\si@unt@setopts}[1]{%
+  \expandafter\expandafter\expandafter\expandafter\expandafter
+    \expandafter\expandafter\si@temptoks\expandafter
+    \expandafter\expandafter\expandafter\expandafter
+    \expandafter\expandafter{\expandafter%
+      \csname\expandafter\@gobble\string#1@opt@unt@si%
+      \endcsname}%
+  \expandafter\sisetup\expandafter{\the\si@temptoks}%
+  \si@log@debug{Applying options `\the\si@temptoks'
+    for\MessageBreak unit \string#1}%
+%    \end{macrocode}
+% The user options are reloaded, if defined, to ensure that they
+% still work as expected.
+%    \begin{macrocode}
+  \@ifundefined{si@unt@SIopts}{}
+    {\ifx\@empty\si@unt@SIopts\@empty\else
+       \expandafter\expandafter\si@unt@setSIopts
+     \fi}}
+\newcommand*{\si@unt@setSIopts}{%
+  \expandafter\si@temptoks\expandafter{\si@unt@SIopts}%
+  \expandafter\sisetup\expandafter{\the\si@temptoks}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@second}
+%\begin{macro}{\si@unt@third}
+% For everything apart from the first item to be processed, spacing
+% may need to be added to separated different units.  The macro is
+% divided into two, so that everything except the space can be added
+% in finalisation.\\
+%\cs{si@unt@second}\marg{num}\marg{unit}
+%    \begin{macrocode}
+\newcommand*{\si@unt@second}[2]{%
+  \si@ifnotmtarg{#1}
+    {\si@log@warn{Optional argument to unit macro\MessageBreak
+       allowed only for outer unit}}%
+  \si@unt@third
+  \si@unt@addtostack{space}{\ensuremath{\si@unitsep}}}
+\newcommand*{\si@unt@third}{%
+  \ifsi@unt@prepower\else
+    \expandafter\si@unt@stkpower
+  \fi
+%    \end{macrocode}
+% A check is made to avoid adding $-1$ to prefixes.  If \opt{frac} is
+% active, then the |b| stack will be in use, otherwise it will be
+% |a|.
+%    \begin{macrocode}
+  \renewcommand*{\si@tempa}{prefix}%
+  \expandafter\ifx
+    \csname si@unt@lastadd\si@unt@checkstack\endcsname\si@tempa
+  \else
+    \expandafter\si@unt@spacecheck
+  \fi
+  \ifsi@unt@per
+    \expandafter\si@unt@perseentrue
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@spacecheck}
+% A check to prevent adding $-1$ at the very beginning of the unit,
+% where there is a space on the stack.
+%    \begin{macrocode}
+\newcommand*{\si@unt@spacecheck}{%
+  \renewcommand*{\si@tempa}{space}%
+  \expandafter\ifx
+    \csname si@unt@lastadd\si@unt@checkstack\endcsname\si@tempa
+  \else
+    \expandafter\si@unt@reciptest
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@prefix}
+% Actual output of the prefixes.\\
+%\cs{si@unt@prefix}\marg{multiple}\marg{powers-ten}\marg{symbol}
+%    \begin{macrocode}
+\newcommand*{\si@unt@prefix}[3]{%
+  \si@unt@firstorsecond{}{#1}%
+  \ifsi@prefixsymbolic
+    \expandafter\si@unt@addprefix
+  \else
+    \expandafter\si@unt@countprefix
+  \fi
+  {#1}{#2}{#3}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@addprefix}
+% To add the prefix, a little translation is needed.\\
+%\cs{si@unt@countprefix}\marg{gobble}\marg{gobble}\marg{symbol}
+%    \begin{macrocode}
+\newcommand*{\si@unt@addprefix}[3]{%
+  \si@unt@addtostack{prefix}{#3}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@prefixcnt}
+%\begin{macro}{\si@unt@countprefix}
+%\begin{macro}{\si@unt@invprefix}
+% On the other hand, to count the prefix numeral, the symbol is
+% thrown away.\\
+%\cs{si@unt@countprefix}\marg{multiple}\marg{powers-ten}\marg{gobble}
+%    \begin{macrocode}
+\newcount\si@unt@prefixcnt
+\newcommand*{\si@unt@countprefix}[3]{%
+%    \end{macrocode}
+% A check is made for binary units.
+%    \begin{macrocode}
+  \renewcommand*{\si@tempa}{binary}%
+  \expandafter\expandafter\expandafter\ifx\expandafter
+    \csname\expandafter\@gobble\string#1@opt@si\endcsname
+    \si@tempa
+    \expandafter\sisetup
+  \else
+    \expandafter\@gobble
+  \fi
+  {prefixbase=two}%
+  \si@tempcnta#2\relax
+  \ifsi@unt@per
+    \expandafter\si@unt@invprefix
+  \fi
+  \advance\si@unt@prefixcnt\si@tempcnta\relax}
+\newcommand*{\si@unt@invprefix}{%
+  \si@tempcntb\si@tempcnta\relax
+  \si@tempcnta -\si@tempcntb\relax}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@litpower}
+% For literal power output, the number can't simply be dumped, so
+% a macro is needed.\\
+%\cs{si@unt@litpower}\marg{gobble}\marg{num}
+%    \begin{macrocode}
+\newcommand*{\si@unt@litpower}[2]{\textsuperscript{#2}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@unt@prepower}
+%\begin{macro}{\si@unt@power}
+% The handling of powers starts by ensuring that ``pre'' powers
+% follow \cs{per} cleanly.  Then a check is needed for inversion.\\
+%\cs{si@unt@power}\marg{power}\marg{num}
+%    \begin{macrocode}
+\newif\ifsi@unt@prepower
+\newcommand*{\si@unt@power}[2]{%
+  \renewcommand*{\si@tempa}{post}%
+  \expandafter\expandafter\expandafter\ifx\expandafter
+    \csname\expandafter\@gobble\string#1@opt@si\endcsname
+    \si@tempa
+    \expandafter\@gobbletwo
+  \else
+    \expandafter\si@unt@firstorsecond
+  \fi
+  {}{\power}%
+  \si@unt@powerdim #2 pt\relax
+  \ifsi@frac\else
+    \ifsi@unt@per
+      \expandafter\expandafter\expandafter\si@unt@invpower
+    \fi
+  \fi
+  \renewcommand*{\si@tempa}{post}%
+  \si@unt@prepowertrue
+  \expandafter\expandafter\expandafter\ifx\expandafter
+    \csname\expandafter\@gobble\string#1@opt@si\endcsname
+    \si@tempa
+    \expandafter\si@unt@stackpower
+  \else
+    \si@log@debug{Power \strip@pt\si@unt@powerdim\space saved
+      to be added after\MessageBreak next unit}%
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@powerdim}
+% To do sign-inversion on the power, a dimension is used (this allows
+% non-integer values to be handled).
+%    \begin{macrocode}
+\newdimen\si@unt@powerdim
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@stackpower}
+%\begin{macro}{\si@unt@stkpower}
+%\begin{macro}{\si@unt@stkpwr}
+% Adding powers to the stack should also clear the power list.  If
+% the number is already zero, then  of course nothing happens.
+%    \begin{macrocode}
+\newcommand*{\si@unt@stackpower}{%
+  \si@unt@prepowerfalse
+%    \end{macrocode}
+% A trap is used for $-1$ added to the denominator of a fraction.
+%    \begin{macrocode}
+  \si@unt@stkpower
+  \ifsi@stickyper\else
+    \si@unt@perfalse
+    \si@unt@perseenfalse
+  \fi}
+%    \end{macrocode}
+% The \cs{si@unt@stkpower} macro needs to be called from a few
+% places, so is spun out from the above.
+%    \begin{macrocode}
+\newcommand*{\si@unt@stkpower}{%
+  \ifdim\si@unt@powerdim=\m@ne pt\relax
+    \ifsi@frac\else
+      \expandafter\expandafter\expandafter\si@unt@stkpwr
+    \fi
+  \else
+    \expandafter\si@unt@stkpwr
+  \fi}
+%    \end{macrocode}
+% Finally, the actual adding (set up to avoid problems with the
+% \cs{if} above).
+%    \begin{macrocode}
+\newcommand*{\si@unt@stkpwr}{%
+  \ifdim\si@unt@powerdim=\z@\relax\else
+    \renewcommand*{\si@tempa}{unit}%
+    \expandafter\ifx
+      \csname si@unt@lastadd\si@unt@checkstack\endcsname
+      \si@tempa
+      \si@log@debug{Adding power
+        \strip@pt\si@unt@powerdim\space to output stack}%
+      \si@unt@addtostack{power}{^{\num{%
+        \strip@pt\si@unt@powerdim}}}%
+    \fi
+  \fi
+  \si@unt@powerdim\z@\relax}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@invpower}
+% A macro to change the sign of the current power.
+%    \begin{macrocode}
+\newcommand*{\si@unt@invpower}{%
+  \si@tempdima\si@unt@powerdim\relax
+  \si@unt@powerdim -\si@tempdima\relax
+%    \end{macrocode}
+% The power might end up as ``1'', which is not wanted.  So it is
+% chucked away.
+%    \begin{macrocode}
+  \ifdim\si@unt@powerdim=\p@\relax
+    \si@unt@powerdim\z@\relax
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@unt@per}
+%\begin{macro}{\ifsi@unt@perseen}
+%\begin{macro}{\per}
+%\begin{macro}{\si@per}
+%\begin{macro}{\si@unt@per}
+% The \cs{per} macro sets the correct flags; almost everything else
+% is done elsewhere.  There is always the case of two \cs{per}
+% instructions; so the flag is flipped rather than set arbitrarily.
+% The second flag is needed so that \cs{per} can give powers of $-1$
+% properly.
+%    \begin{macrocode}
+\newif\ifsi@unt@per
+\newif\ifsi@unt@perseen
+\si@newrobustcmd*{\si@per}{%
+  \ifsi@unt@littest\else
+    \ifsi@unt@litout
+      \expandafter\expandafter\expandafter /%
+    \else
+      \ifsi@unt@litprefix
+        \expandafter\expandafter\expandafter\expandafter
+          \expandafter\expandafter\expandafter /%
+      \else
+        \expandafter\expandafter\expandafter\expandafter
+          \expandafter\expandafter\expandafter\si@unt@per
+      \fi
+    \fi
+  \fi}
+\newcommand*{\si@unt@per}{%
+  \si@unt@firstorsecond{}{\per}%
+  \ifsi@unt@per
+    \ifsi@stickyper\else
+      \expandafter\expandafter\expandafter\si@unt@perfalse
+    \fi
+  \else
+    \expandafter\si@unt@pertrue
+  \fi}
+\let\per\si@per
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@reciptest}
+%\begin{macro}{\si@unt@recip}
+% A test is needed for adding $-1$ when needed. The second macro is
+% fired only if the power should be reciprocal.
+%    \begin{macrocode}
+\newcommand*{\si@unt@reciptest}{%
+  \ifsi@unt@per
+    \ifsi@unt@perseen
+      \expandafter\expandafter\expandafter\si@unt@recip
+    \fi
+  \fi}
+\newcommand*{\si@unt@recip}{%
+  \si@unt@powerdim\m@ne pt\relax
+  \si@unt@stackpower}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@lastadda}
+%\begin{macro}{\si@unt@lastaddb}
+%\begin{macro}{\si@unt@addtostack}
+% Items cannot be added directly to the stacks (except the spacing
+% stack, a) as the fractional handling may need to add the item to
+% either storage area.  By indicating the type of data to be added to
+% the stack, problems can be avoided.\\
+%\cs{si@unt@addtostack}\marg{type}\marg{token}
+%    \begin{macrocode}
+\newcommand*{\si@unt@lastadda}{}
+\newcommand*{\si@unt@lastaddb}{}
+\newcommand*{\si@unt@addtostack}[2]{%
+  \renewcommand*{\si@tempa}{#1}%
+%    \end{macrocode}
+% Two consecutive items cannot be of the same type; there must be spaces
+% between units, units between prefixes, \etc.
+%    \begin{macrocode}
+  \expandafter\ifx
+    \csname si@unt@lastadd\si@unt@checkstack\endcsname\si@tempa
+    \expandafter\@gobbletwo
+  \else
+    \expandafter\si@unt@preplussp
+  \fi
+  {#1}{#2}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@preplussp}
+% The space added after a prefix needs to be ignored.\\
+%\cs{si@unt@preplussp}\marg{type}\marg{stack}\marg{token}^^A
+%  \marg{gobble}
+%    \begin{macrocode}
+\newcommand*{\si@unt@preplussp}[2]{%
+  \renewcommand*{\si@tempa}{prefix+space}%
+  \edef\si@tempb{%
+    \csname si@unt@lastadd\si@unt@checkstack\endcsname+#1}%
+  \ifx\si@tempa\si@tempb
+    \expandafter\@gobbletwo
+  \else
+    \expandafter\si@unt@stack
+  \fi
+  {#1}{#2}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@stack}
+% The macro for actually doing the stacking up.\\
+%\cs{si@unt@stack}\marg{type}\marg{tokens}
+%    \begin{macrocode}
+\newcommand*{\si@unt@stack}[2]{%
+  \expandafter\renewcommand\expandafter*\expandafter{%
+    \csname si@unt@lastadd\si@unt@checkstack\endcsname}{#1}%
+%    \end{macrocode}
+% A count is kept of the number of \emph{units} added to each stack.
+%    \begin{macrocode}
+  \renewcommand*{\si@tempa}{#1}%
+  \renewcommand*{\si@tempb}{unit}%
+  \ifx\si@tempa\si@tempb
+    \expandafter\si@unt@inccnt
+  \fi
+%    \end{macrocode}
+% If a space is added, it is actually held until the next add.
+%    \begin{macrocode}
+  \renewcommand*{\si@tempb}{space}%
+  \ifx\si@tempa\si@tempb
+    \expandafter\si@unt@holdspace
+  \else
+    \expandafter\si@unt@addstack
+  \fi
+  {#2}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@inccnt}
+% The appropriate counter is added to.
+%    \begin{macrocode}
+\newcommand*{\si@unt@inccnt}{%
+  \expandafter\advance
+    \csname si@unt@unitcnt\si@unt@checkstack\endcsname
+    \@ne\relax}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@holdspace}
+%\begin{macro}{\si@unt@addstack}
+%\begin{macro}{\si@unt@holdstacka}
+%\begin{macro}{\si@unt@holdstackb}
+% Depending on the nature of the addition, it is either held or added
+% to the stack.  For the ``b'' space stack, a check is made to ensure
+% that a space cannot be added before the first item.\\
+%\cs{si@unt@holdspace}\marg{tokens}\\
+%\cs{si@unt@addstack}\marg{tokens}
+%    \begin{macrocode}
+\newcommand*{\si@unt@holdstacka}{}
+\newcommand*{\si@unt@holdstackb}{}
+\newcommand*{\si@unt@holdspace}[1]{%
+  \renewcommand*{\si@tempa}{b}%
+  \edef\si@tempb{\si@unt@checkstack}%
+  \ifx\si@tempa\si@tempb
+    \ifx\@empty\si@unt@stackb\@empty
+    \else
+      \expandafter\protected@edef
+      \csname si@unt@holdstack\si@unt@checkstack\endcsname{#1}%
+    \fi
+  \else
+    \expandafter\protected@edef
+    \csname si@unt@holdstack\si@unt@checkstack\endcsname{#1}%
+  \fi}
+\newcommand*{\si@unt@addstack}[1]{%
+  \expandafter\protected@edef
+    \csname si@unt@stack\si@unt@checkstack\endcsname
+    {\csname si@unt@stack\si@unt@checkstack\endcsname
+     \csname si@unt@holdstack\si@unt@checkstack\endcsname#1}%
+  \expandafter\renewcommand\expandafter*\expandafter{%
+    \csname si@unt@holdstack\si@unt@checkstack\endcsname}{}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@unt@stackout}
+% The stack contents are actually typeset here.  First the spacing
+% between units and values is added.
+%    \begin{macrocode}
+\newcommand*{\si@unt@stackout}{%
+  \si@unt@litouttrue
+  \ifsi@frac
+    \expandafter\si@unt@fracout
+  \else
+    \expandafter\si@unt@normout
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@checkstack}
+% Which stack is in use needs to be tested.
+%    \begin{macrocode}
+\newcommand*{\si@unt@checkstack}{%
+  \ifsi@frac
+    \ifsi@unt@per
+      \expandafter\expandafter\expandafter b%
+    \else
+      \expandafter\expandafter\expandafter a%
+    \fi
+  \else
+    \expandafter a%
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@spaceout}
+% The space before a unit might not be needed, so it crops up a few
+% times in the output routine.
+%    \begin{macrocode}
+\newcommand*{\si@unt@spaceout}{%
+   \ensuremath{\si@unt@spstack}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@prefixout}
+% If the prefix counter is not zero, then there is something to
+% typeset.
+%    \begin{macrocode}
+\newcommand*{\si@unt@prefixout}{%
+  \ifnum\si@unt@prefixcnt=\z@\relax\else
+    \ifsi@unt@num
+      \si@out{\ensuremath{{}\si@prefixproduct{}}}%
+    \fi
+    \si@unt@stackvalsep
+    \let\si@expbase\si@prefixbase
+    \num{e\the\si@unt@prefixcnt}%
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@normout}
+% The normal output mode is set up here; nothing much needs to be
+% done as there is no need for complex checks.
+%    \begin{macrocode}
+\newcommand*{\si@unt@normout}{%
+  \si@unt@prefixout
+  \si@unt@spaceout
+  \expandafter\si@unt@out\expandafter{\si@unt@stacka}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@fracout}
+% For fractions, some checks are needed.
+%    \begin{macrocode}
+\newcommand*{\si@unt@fracout}{%
+  \si@unt@notambig
+  \ifx\@empty\si@unt@stacka\@empty
+    \ifx\@empty\si@unt@stackb\@empty
+      \ifsi@unt@litout\else
+        \si@log@err{Empty fractional unit}{The unit
+          argument\MessageBreak given does not contain any
+          symbols}%
+      \fi
+    \else
+%    \end{macrocode}
+% With an empty numerator, no space is added
+%    \begin{macrocode}
+      \ifsi@slash
+        \si@unt@prefixout
+        \si@frac{}{\si@unt@stackb}%
+      \else
+        \si@unt@prefixout
+        \si@unt@spaceout
+        \si@frac{1}{\si@unt@stackb}%
+      \fi
+    \fi
+  \else
+%    \end{macrocode}
+% If the denominator is empty, then the usual output system can be
+% used.
+%    \begin{macrocode}
+    \ifx\@empty\si@unt@stackb\@empty
+      \si@unt@normout
+    \else
+      \si@unt@prefixout
+      \si@unt@spaceout
+      \si@frac{\si@unt@stacka}{\si@unt@stackb}%
+    \fi
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@notambig}
+%\begin{macro}{\si@unt@notabg}
+% A trap is set for adding brackets to units using a slash, when more
+% than one unit is in the denominator.
+%    \begin{macrocode}
+\newcommand*{\si@unt@notambig}{%
+  \ifnum\si@unt@unitcntb>\@ne\relax
+    \ifsi@slash
+        \ifsi@trapambigfrac
+          \expandafter\expandafter\expandafter\expandafter
+            \expandafter\expandafter\expandafter\si@unt@notabg
+        \fi
+    \fi
+  \fi}
+\newcommand*{\si@unt@notabg}{%
+  \protected@edef\si@unt@stackb{\si@openfrac\si@unt@stackb
+    \si@closefrac}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%
+%\begin{macro}{\si@unt@out}
+% The final part of the units system is the output routine.  This has
+% to cope with units not only as macros but also as direct input
+% (\SIstyle-type input).  Non-Latin characters are also handled
+% cleanly. As usual, \cs{scantokens} is used to make life easier.\\
+%\cs{si@unt@out}\marg{unit}
+%    \begin{macrocode}
+\begingroup
+  \catcode`\~=\active
+  \catcode`\.=\active
+  \gdef\si@unt@out#1{%
+    \begingroup
+      \si@unt@nonlatin
+      \makeatletter
+      \catcode`\~=\active
+      \catcode`\.=\active
+      \def~{\ensuremath{\si@unitspace}}%
+      \def.{\ensuremath{\si@unitsep}}%
+      \endlinechar\m@ne
+      \si@out{\scantokens{#1}}%
+    \endgroup}
+\endgroup
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@nonlatin}
+% To handle non-Latin symbols in the input, a single macro is
+% provided.  If \XeTeX\ is in use, this can be detected immediately.
+%    \begin{macrocode}
+\newcommand*{\si@unt@nonlatin}{}
+\ifdefined\XeTeXrevision
+  \renewcommand*{\si@unt@nonlatin}{%
+    \catcode176=\active
+    \catcode181=\active
+    \catcode197=\active
+    \si@unt@sym{176}{\si@sym@degree}%
+    \si@unt@sym{181}{\si@sym@mu}%
+    \si@unt@sym{197}{\si@sym@ringA}}%
+\fi
+%    \end{macrocode}
+% If \pkg{inputenc} has been loaded, then a check is made that the
+% encoding is correct.  If all is well, the non-Latin symbols are
+% handled.  The degree symbol is character 176, the micro
+% symbol is character 181 and ring capital A is character 197 in
+% latin1.
+%    \begin{macrocode}
+\AtBeginDocument{
+  \@ifpackageloaded{inputenc}
+    {\@for\si@tempa:=latin1,latin5,latin9\do{
+       \ifx\inputencodingname\si@tempa
+         \renewcommand*{\si@unt@nonlatin}{%
+           \catcode176=\active
+           \catcode181=\active
+           \catcode197=\active
+           \si@unt@sym{176}{\si@sym@degree}%
+           \si@unt@sym{181}{\si@sym@mu}%
+           \si@unt@sym{197}{\si@sym@ringA}}%
+       \fi}}
+    {}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@unt@sym}
+% A macro for declaring symbols: a copy of \cs{DeclareInputMath} from
+% \pkg{inputenc}.\\
+%\cs{si@unt@sym}\marg{charcode}
+%    \begin{macrocode}
+\newcommand*{\si@unt@sym}[1]{%
+  \bgroup
+    \uccode`\~#1%
+    \uppercase{%
+      \egroup
+      \def~}}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\kilogram}
+%\begin{macro}{\metre}
+%\begin{macro}{\meter}
+%\begin{macro}{\mole}
+%\begin{macro}{\kelvin}
+%\begin{macro}{\candela}
+%\begin{macro}{\second}
+%\begin{macro}{\ampere}
+% With the system set up, the basic unit macros are implemented.  The
+% only units defined whatever options are given are the base SI
+% units.
+%    \begin{macrocode}
+\newunit{\kilogram}{kg}
+\newunit{\metre}{m}
+\newunit{\meter}{\metre}
+\newunit{\mole}{mol}
+\newunit{\second}{s}
+\newunit{\ampere}{A}
+\newunit{\kelvin}{K}
+\newunit{\candela}{cd}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\Square}
+%\begin{macro}{\ssquare}
+%\begin{macro}{\squared}
+%\begin{macro}{\cubic}
+%\begin{macro}{\cubed}
+% Unlike multiples (which can be skipped if needed), the basic powers
+% are also always defined.
+%    \begin{macrocode}
+\newpower{\Square}{2}
+\newpower{\ssquare}{2}
+\newpower[post]{\squared}{2}
+\newpower{\cubic}{3}
+\newpower[post]{\cubed}{3}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\tothe}
+%\begin{macro}{\si@tothe}
+%\begin{macro}{\raiseto}
+%\begin{macro}{\tothe@opt@si}
+%\begin{macro}{\raiseto@opt@si}
+% A macro for arbitrary powers, which comes after the unit and so
+% needs to be marked as such.\\
+%\cs{tothe}\marg{num}\\
+%\cs{raiseto}\marg{num}
+%    \begin{macrocode}
+\newcommand*{\tothe}{\si@tothe{\tothe}}
+\newcommand*{\raiseto}{\si@tothe{\raiseto}}
+\newcommand*{\si@tothe}[2]{%
+  \ifsi@unt@littest
+    \expandafter\@gobbletwo
+  \else
+    \ifsi@unt@litout
+      \expandafter\expandafter\expandafter\si@unt@litpower
+    \else
+      \expandafter\expandafter\expandafter\si@unt@power
+    \fi
+  \fi
+  {#1}{#2}}
+\newcommand*{\tothe@opt@si}{post}
+\newcommand*{\raiseto@opt@si}{}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%
+%\subsection{Locales}
+%\begin{macro}{\si@loc@load}
+%\begin{macro}{\si@loc@sisetup}
+% When loading a locale, the setup is saved rather than applied.
+% Anything other than simple settings should be inside
+% \cs{addtolocale}, which is already defined.\\
+%\cs{si@loc@load}\marg{locale}
+%    \begin{macrocode}
+\newcommand*{\si@loc@load}[1]{%
+  \let\si@loc@sisetup\sisetup
+  \renewcommand*{\sisetup}[1]{%
+    \expandafter\gdef\csname si@loc@#1\endcsname{##1}}
+  \si@loadfile{#1}%
+  \let\sisetup\si@loc@sisetup}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@loc@set}
+% Setting the locale transfers the settings to \cs{sisetup}, and runs
+% any extra macros.\\
+%\cs{si@loc@set}\marg{locale}
+%    \begin{macrocode}
+\newcommand*{\si@loc@set}[1]{%
+  \ifcsname si@loc@#1\endcsname
+    \si@log@inf{Setting locale to `#1'}%
+    \expandafter\expandafter\expandafter\expandafter
+      \expandafter\expandafter\expandafter\si@temptoks
+      \expandafter\expandafter\expandafter\expandafter
+      \expandafter\expandafter\expandafter{%
+        \expandafter\csname si@loc@#1\endcsname}%
+    \expandafter\sisetup\expandafter{\the\si@temptoks}%
+    \ifcsname si@loc@#1@extra\endcsname
+      \csname si@loc@#1@extra\endcsname
+    \fi
+  \else
+    \ifcsname si@loc@#1@extra\endcsname
+      \si@log@inf{Setting locale to `#1'}%
+      \csname si@loc@#1@extra\endcsname
+    \else
+      \si@log@warn{Unknown locale `#1'}%
+    \fi
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@loc@ltol}
+%    \begin{macrocode}
+\newcommand*{\si@loc@ltol}[1]{%
+  \def\si@tempa##1:##2\@nil{\si@loc@load{##1}}
+  \@for\si@tempb:=#1\do{%
+    \expandafter\si@tempa\si@tempb:\@nil}
+  \AtBeginDocument{
+    \@ifpackageloaded{babel}
+      {\def\si@tempa##1:##2:##3\@nil{%
+        \expandafter\addto\expandafter{%
+          \csname extras##2\endcsname}%
+          {\si@loc@set{##1}}}%
+       \@for\si@tempb:=#1\do{%
+         \expandafter\si@tempa\si@tempb::\@nil}}
+      {\si@log@warn{babel not loaded \MessageBreak
+        loctolang option ignored}}}}
+\AtBeginDocument{
+  \@ifpackageloaded{babel}
+    {\renewcommand*{\si@loc@ltol}[1]{%
+       \def\si@tempa##1:##2\@nil{\si@loc@load{##1}}%
+       \@for\si@tempb:=#1\do{%
+         \expandafter\si@tempa\si@tempb:\@nil}%
+       \def\si@tempa##1:##2:##3\@nil{%
+         \expandafter\addto\expandafter{%
+           \csname extras##2\endcsname}%
+           {\si@loc@set{##1}}}%
+       \@for\si@tempb:=#1\do{%
+         \expandafter\si@tempa\si@tempb::\@nil}}}
+    {\renewcommand*{\si@loc@ltol}[1]{%
+       \si@log@warn{babel not loaded \MessageBreak
+         loctolang option ignored}}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\addtolocale}
+% Arbitrary macros may need to be added to the locale.\\
+%\cs{addtolocale}\marg{locale}\marg{commands}
+%    \begin{macrocode}
+\newcommand*{\addtolocale}[2]{%
+  \si@addtocsname{si@loc@#1@extra}{#2}}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Output routine}
+%\begin{macro}{\si@out}
+% With all of the setup done, the text can finally be typeset.  This
+% is done inside a \cs{text} block, which takes care of
+% \cs{ensuremath}, \etc.  First of all, the various catcode settings
+% needed to get maths-in-text mode are made.  \cs{makeatletter} is
+% needed so that \cs{scantokens} still allows internal macros to
+% work.\\
+%\cs{si@out}\marg{text}
+%    \begin{macrocode}
+\begingroup
+  \catcode`\^=\active\relax
+  \catcode`\-=\active\relax
+  \gdef\si@out#1{%
+    \begingroup
+      \catcode`\^=\active\relax
+      \makeatletter
+      \endlinechar\m@ne
+%    \end{macrocode}
+% The various font families can now be set up.  First a check is made
+% in case there are nested calls to \cs{si@out@text}.
+%    \begin{macrocode}
+      \ifsi@fam@set\else
+        \expandafter\si@fam@set
+      \fi
+      \si@colourcmd{\si@colour}%
+      \text{\si@fam@italic\si@fam@bold\si@fam@text
+%    \end{macrocode}
+%  The correct mode is selected, and the input is handed off for
+%  typesetting.
+%    \begin{macrocode}
+        \ifsi@textmode
+          \expandafter\si@out@text
+        \else
+          \expandafter\si@out@maths
+        \fi
+        {\scantokens{#1}}}%
+    \endgroup
+    \check@mathfonts}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@out@text}
+%\begin{macro}{\si@out@maths}
+% Output occurs with the correct changes to superscript behaviour.\\
+%\cs{si@out@text}\marg{text}\\
+%\cs{si@out@maths}\marg{text}
+%    \begin{macrocode}
+  \gdef\si@out@text#1{%
+    \let^\si@out@sp
+    \let\textsuperscript\si@out@sp
+    \catcode`\-=\active\relax
+    \let-\si@out@minus
+    #1}
+  \gdef\si@out@maths#1{%
+    \let^\sp
+    \let\textsuperscript\sp
+    $\si@fam@maths{#1}$}
+\endgroup
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@out@sp}
+% \cs{textsuperscript} gives slightly different alignment of numbers
+% to using |^| in text mode.  To avoid this, a slightly different
+% definition is used.  Elsewhere \cs{textsuperscript} is used, as
+% the code above sorts out the text/maths mode issues.\\
+%\cs{si@out@sp}\marg{text}
+%    \begin{macrocode}
+\newcommand*{\si@out@sp}[1]{\ensuremath{^{\text{#1}}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@out@minus}
+% An active minus sign is needed.
+%    \begin{macrocode}
+\newcommand*{\si@out@minus}{\ensuremath{-}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ifsi@out@num}
+% A flag is needed to control output settings.  This will be
+% false unless inside \cs{si@out@num}.
+%    \begin{macrocode}
+\newif\ifsi@out@num
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@out@num}
+% For numerical output, the default fonts are controlled slightly
+% differently to text output.\\
+%\cs{si@out@num}\marg{num}
+%    \begin{macrocode}
+\newcommand*{\si@out@num}[1]{%
+  \begingroup
+    \si@out@numtrue
+    \si@out{#1}%
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Finalisation}
+%\begin{macro}{\si@extension}
+%\begin{macro}{\si@fileprefix}
+% To keep the code easy to maintain, the reusable filename components
+% are macros rather than literals.
+%    \begin{macrocode}
+\newcommand*{\si@extension}{cfg}
+\newcommand*{\si@fileprefix}{si-}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@ifl@aded}
+%\begin{macro}{\si@ifloaded}
+% A bit of borrowing from the \LaTeX\ kernel.  A copy of \cs{@ifl@aded}
+% is needed as things aren't always done in the preamble by
+% \currpkg.\\
+%\cs{si@ifloaded}\marg{package}
+%    \begin{macrocode}
+\newcommand*{\si@ifl@aded}{}
+\let\si@ifl@aded\@ifl@aded
+\newcommand*{\si@ifloaded}[1]{%
+  \si@ifl@aded\si@extension{\si@fileprefix#1}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@loadfile}
+% Loading configuration files is handled here.\\
+%\cs{si@loadfile}\marg{file}
+%    \begin{macrocode}
+\newcommand*{\si@loadfile}[1]{%
+  \si@ifloaded{#1}{}
+    {\InputIfFileExists{\si@fileprefix#1.\si@extension}
+      {}
+      {\si@log@err{Failed to load file
+         \si@fileprefix#1.\si@extension}
+         {The configuration file requested could not be
+          found}}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\requiresiconfigs}
+% The configuration files depend on each other.\\
+%\cs{requiresiconfigs}\marg{cfg-file}
+%    \begin{macrocode}
+\newcommand*{\requiresiconfigs}[1]{%
+  \@for\si@tempb:=#1\do{\si@loadfile{\si@tempb}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@loademfile}
+% For emulation files, an additional check is made.\\
+%\cs{si@loademfile}\marg{file}
+%    \begin{macrocode}
+\newcommand*{\si@loademfile}[1]{%
+  \@ifpackageloaded{#1}
+    {\si@log@err{Emulation clash for package `#1'}
+      {You have asked for emulation of package
+       `#1'\MessageBreak
+       (perhaps by giving siunitx a back-compatibility
+       option)\MessageBreak but the package is already
+       loaded!}}
+    {\si@loadfile{#1}}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@emclash}
+% A macro for emulation clashes.\\
+%\cs{si@emclash}\marg{package}\marg{package}
+%    \begin{macrocode}
+\newcommand*{\si@emclash}[2]{%
+  \si@log@err{Emulation clash: `#1' and `#2'}
+    {You have asked for emulation of package `#1'\MessageBreak
+     but have already loaded emulation of `#2'}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@emulating}
+% For packages that are emulated, the \LaTeX\ mechanism to prevent
+% re-loading is used.  The list of packages to check at the start
+% of the document also has to be altered.\\
+%\cs{si@emulating}\marg{package}\marg{version}
+%    \begin{macrocode}
+\newcommand*{\si@emulating}[2]{%
+  \@namedef{ver@#1.sty}{#2 siunitx emulation of #1}%
+  \let\si@tempa\si@blockpkgs
+  \renewcommand*{\si@blockpkgs}{}%
+  \@for\si@tempb:=\si@tempa\do{%
+    \renewcommand*{\si@tempa}{#1}%
+    \ifx\si@tempa\si@tempb\else
+      \lowercase{\edef\si@tempa{#1}}%
+      \lowercase{\edef\si@tempc{\si@tempb}}%
+      \ifx\si@tempa\si@tempc
+        \@namedef{ver@\si@tempc.sty}{#2 siunitx emulation of
+          #1}%
+      \else
+        \si@addtolist{\si@blockpkgs}{\si@tempb}%
+      \fi
+    \fi}%
+  \let\si@tempa\si@checkpkgs
+  \renewcommand*{\si@checkpkgs}{}%
+  \renewcommand*{\si@tempb}{#1}%
+  \@for\si@tempc:=\si@tempa\do{%
+    \ifx\si@tempb\si@tempc\else
+      \si@addtolist{\si@checkpkgs}{\si@tempc}%
+    \fi}}
+%    \end{macrocode}
+%\end{macro}
+% With the \currpkg kernel macros defined, the package can now run
+% through finalisation.  First, the default key values are set. The
+% user options are then processed.
+%    \begin{macrocode}
+\sisetup{
+  addsign=none,
+  allowzeroexp=false,
+  angformat=unchanged,
+  astroang=false,%(
+  closeerr=),%(
+  closefrac=),
+  colour=black,
+  colourall=false,
+  colourneg=false,
+  decimalsymbol=fullstop,
+  detectdisplay=true,
+  digitsep=thin,
+  dp=3,
+  eVcorra=0.3ex,
+  eVcorrb=0ex,
+  errspace=none,
+  fixdp=false,
+  inlinebold=text,
+  load=default,
+  mathsrm=mathrm,
+  mathssf=mathsf,
+  mathstt=mathtt,
+  mode=maths,
+  negcolour=red,
+  noload={},
+  numaddn={},%(
+  numcloseerr=),%
+  numdecimal={.,},
+  numdigits=0123456789,
+  numexp=eEdD,
+  numgobble={},
+  numopenerr=(,%)
+  numprod=x,
+  numsign=+-\pm\mp,
+  obeybold=false,
+  obeyitalic=false,
+  obeymode=false,
+  openerr=(,%)
+  openfrac=(,%)
+  padangle=small,
+  padnumber=lead,
+  per=reciprocal,
+  prefixbase=ten,
+  prefixproduct=times,
+  prefixsymbolic=true,
+  prespace=false,
+  redefsymbols=true,
+  repeatunits=true,
+  retainplus=false,
+  seperr=false,
+  sepfour=false,
+  sign=plus,
+  slash=slash,
+  stickyper=false,
+  strictarc=true,
+  tabalignexp=true,
+  tabautofit=false,
+  tabformat=3.2,
+  tabnumalign=centredecimal,
+  tabtextalign=centre,
+  tabunitalign=left,
+  textrm=rmfamily,
+  textsf=sffamily,
+  texttt=ttfamily,
+  tightpm=false,
+  trapambigerr=true,
+  trapambigfrac=true,
+  unitsep=thin,
+  valuesep=thin,
+  xspace=false}
+\ProcessOptionsX[si]<key>
+%    \end{macrocode}
+% A check is now made so that emulation takes place one file at a
+% time, and that each file is loaded only once.
+%    \begin{macrocode}
+\ifx\@empty\si@emulate\@empty\else
+  \@for\si@tempa:=\si@emulate\do{%
+    \si@loademfile{\si@tempa}}
+\fi
+%    \end{macrocode}
+%\begin{macro}{\si@expanddefault}
+% For turning the list of default choices into a loadable list.
+%    \begin{macrocode}
+\newcommand*{\si@expanddefault}[2]{%
+  \expandafter\ifx\expandafter\@empty\csname si@#1\endcsname
+    \@empty
+  \else
+    \renewcommand*{\si@tempb}{default}%
+    \renewcommand*{\si@tempc}{}%
+    \expandafter\@for\expandafter\si@tempa\expandafter
+      :\expandafter=\csname si@#1\endcsname\do{%
+      \ifx\si@tempa\si@tempb
+        \si@addtolist{\si@tempc}{#2}%
+      \else
+        \si@addtolist{\si@tempc}{\si@tempa}%
+      \fi}
+    \expandafter\edef\csname si@#1\endcsname{\si@tempc}%
+    \expandafter\si@addtolist\expandafter{%
+      \csname si@no#1\endcsname}%
+      {default}%
+    \renewcommand*{\si@tempc}{}%
+    \expandafter\@for\expandafter\si@tempa\expandafter
+      :\expandafter=\csname si@#1\endcsname\do{%
+      \si@switchfalse
+      \expandafter\@for\expandafter\si@tempb\expandafter
+        :\expandafter=\csname si@no#1\endcsname\do{%
+        \ifx\si@tempa\si@tempb
+          \si@switchtrue
+        \fi
+        \ifsi@switch\else
+          \si@addtolist{\si@tempc}{\si@tempa}%
+        \fi}}
+    \@for\si@tempa:=\si@tempc\do{%
+      \si@loadfile{\si@tempa}}%
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+% The configuration and abbreviation files are loaded.
+%    \begin{macrocode}
+\si@expanddefault{load}{prefix,named,addn,prefixed,accepted,%
+  physical,abbr}
+%    \end{macrocode}
+% The very last job is to load a local configuration file, if one
+% exists, and restore catcodes.
+%    \begin{macrocode}
+\IfFileExists{siunitx.cfg}
+  {\si@log@inf{Local configuration file found}%
+   \InputIfFileExists{siunitx.cfg}{}{}}
+  {}
+\si@catcodes
+%    \end{macrocode}
+%
+%\iffalse
+%</package>
+%\fi
+%
+%\section{Loadable modules}
+% To keep the package relatively clear, and to make maintenance
+% easier, the only units defined in the package itself are the base
+% units. Everything else is a loadable module (similar to the
+% approach in \unitsdef).
+%
+%\iffalse
+%<*prefix>
+%\fi
+%\subsection{Multiple prefixes}
+%\begin{macro}{\yocto}
+%\begin{macro}{\zepto}
+%\begin{macro}{\atto}
+%\begin{macro}{\femto}
+%\begin{macro}{\pico}
+%\begin{macro}{\nano}
+%\begin{macro}{\micro}
+%\begin{macro}{\Micro}
+%\begin{macro}{\milli}
+%\begin{macro}{\centi}
+%\begin{macro}{\deci}
+% The various SI multiple prefixes are defined here.  First the small
+% powers.
+%    \begin{macrocode}
+\ProvidesFile{si-prefix.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   SI Multiple prefixes]
+\newprefix{\yocto}{-24}{y}
+\newprefix{\zepto}{-21}{z}
+\newprefix{\atto}{-18}{a}
+\newprefix{\femto}{-15}{f}
+\newprefix{\pico}{-12}{p}
+\newprefix{\nano}{-9}{n}
+%    \end{macrocode}
+% Some testing is needed for \unitsdef compatibility.
+%    \begin{macrocode}
+\ifsi@old@OHM
+  \newprefix{\Micro}{-6}{\si@sym@mu}
+\else
+  \ifsi@gensymb\else
+    \newprefix{\micro}{-6}{\si@sym@mu}
+  \fi
+\fi
+\newprefix{\milli}{-3}{m}
+\newprefix{\centi}{-2}{c}
+\newprefix{\deci}{-1}{d}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\deca}
+%\begin{macro}{\hecto}
+%\begin{macro}{\kilo}
+%\begin{macro}{\mega}
+%\begin{macro}{\giga}
+%\begin{macro}{\tera}
+%\begin{macro}{\peta}
+%\begin{macro}{\exa}
+%\begin{macro}{\zetta}
+%\begin{macro}{\yotta}
+% Now the large ones.
+%    \begin{macrocode}
+\newprefix{\deca}{1}{da}
+\newprefix{\hecto}{2}{h}
+\newprefix{\kilo}{3}{k}
+\newprefix{\mega}{6}{M}
+\newprefix{\giga}{9}{G}
+\newprefix{\tera}{12}{T}
+\newprefix{\peta}{15}{P}
+\newprefix{\exa}{18}{E}
+\newprefix{\zetta}{21}{Z}
+\newprefix{\yotta}{24}{Y}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\deka}
+% Apparently, ``deka'' is common in the US for deca.
+%    \begin{macrocode}
+\newprefix{\deka}{1}{da}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\gram}
+%\begin{macro}{\kilogram}
+% As the base unit of mass is the kilogram, rather than the gram, a
+% bit of extra work is needed; by default the package only defines
+% \cs{kilogram}, but with the prefixes available, this is altered to
+% be \cs{kilo}\cs{gram}.  For that, the \cs{gram} must be defined first.
+%    \begin{macrocode}
+\newunit{\gram}{g}
+\renewunit{\kilogram}{\kilo\gram}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\iffalse
+%</prefix>
+%<*named>
+%\fi
+%\subsection{Derived units with specific names}
+%\begin{macro}{\becquerel}
+%\begin{macro}{\coulomb}
+%\begin{macro}{\farad}
+%\begin{macro}{\Gray}
+%\begin{macro}{\ggray}
+%\begin{macro}{\hertz}
+%\begin{macro}{\henry}
+%\begin{macro}{\joule}
+%\begin{macro}{\katal}
+%\begin{macro}{\lumen}
+%\begin{macro}{\lux}
+%\begin{macro}{\newton}
+% Derived units with specific names and symbols are defined.  Litre
+% is an awkward one, but here the UK standard is used.
+%    \begin{macrocode}
+\ProvidesFile{si-named.cfg}
+  [\csname si@svn@version\endcsname siunitx: SI Named units]
+\newunit{\becquerel}{Bq}
+\newunit{\coulomb}{C}
+\newunit{\farad}{F}
+\newunit{\Gray}{Gy}
+\newunit{\ggray}{Gy}
+\newunit{\hertz}{Hz}
+\newunit{\henry}{H}
+\newunit{\joule}{J}
+\newunit{\katal}{kat}
+\newunit{\lumen}{lm}
+\newunit{\lux}{lx}
+\newunit{\newton}{N}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ohm}
+%\begin{macro}{\Ohm}
+%\begin{macro}{\pascal}
+%\begin{macro}{\siemens}
+%\begin{macro}{\sievert}
+%\begin{macro}{\tesla}
+%\begin{macro}{\volt}
+%\begin{macro}{\watt}
+%\begin{macro}{\weber}
+% Some testing is needed for \unitsdef compatibility.
+%    \begin{macrocode}
+\ifsi@old@OHM
+  \newunit{\Ohm}{\si@sym@Omega}
+\else
+  \ifsi@gensymb\else
+%    \end{macrocode}
+% To be on the safe side, use \cs{provideunit}.
+%    \begin{macrocode}
+    \provideunit{\ohm}{\si@sym@Omega}
+  \fi
+\fi
+\newunit{\pascal}{Pa}
+\newunit{\siemens}{S}
+\newunit{\sievert}{Sv}
+\newunit{\tesla}{T}
+\newunit{\volt}{V}
+\newunit{\watt}{W}
+\newunit{\weber}{Wb}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\celsius}
+%\begin{macro}{\Celsius}
+% The degree celsius is a named unit.
+%    \begin{macrocode}
+\ifsi@old@OHM
+  \newunit{\Celsius}{\si@sym@celsius}
+\else
+  \ifsi@gensymb\else
+    \newunit{\celsius}{\si@sym@celsius}
+  \fi
+\fi
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\radian}
+%\begin{macro}{\steradian}
+% The radian and steradian are officially derived units.
+%    \begin{macrocode}
+\newunit{\radian}{rad}
+\newunit{\steradian}{sr}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\iffalse
+%</named>
+%<*prefixed>
+%\fi
+%\subsection{Units with prefixes}
+% As in \unitsdef, some commonly used prefixed units are set up.
+% This requires \file{si-prefix.cfg} and \file{si-named.cfg}.
+%    \begin{macrocode}
+\ProvidesFile{si-prefixed.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   SI Prefixed units]
+\requiresiconfigs{prefix,named,accepted,physical}
+%    \end{macrocode}
+%\begin{macro}{\picometre}
+%\begin{macro}{\nanometre}
+%\begin{macro}{\micrometre}
+%\begin{macro}{\millimetre}
+%\begin{macro}{\centimetre}
+%\begin{macro}{\decimetre}
+%\begin{macro}{\kilometre}
+% Extra distances.
+%    \begin{macrocode}
+\newunit{\picometre}{\pico\metre}
+\newunit{\nanometre}{\nano\metre}
+\newunit{\micrometre}{\micro\metre}
+\newunit{\millimetre}{\milli\metre}
+\newunit{\centimetre}{\centi\metre}
+\newunit{\decimetre}{\deci\metre}
+\newunit{\kilometre}{\kilo\metre}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\femtogram}
+%\begin{macro}{\picogram}
+%\begin{macro}{\nanogram}
+%\begin{macro}{\microgram}
+%\begin{macro}{\milligram}
+% Extra masses.
+%    \begin{macrocode}
+\newunit{\femtogram}{\femto\gram}
+\newunit{\picogram}{\pico\gram}
+\newunit{\nanogram}{\nano\gram}
+\newunit{\microgram}{\micro\gram}
+\newunit{\milligram}{\milli\gram}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\femtomole}
+%\begin{macro}{\picomole}
+%\begin{macro}{\nanomole}
+%\begin{macro}{\micromole}
+%\begin{macro}{\millimole}
+% Now some moles.
+%    \begin{macrocode}
+\newunit{\femtomole}{\femto\mole}
+\newunit{\picomole}{\pico\mole}
+\newunit{\nanomole}{\nano\mole}
+\newunit{\micromole}{\micro\mole}
+\newunit{\millimole}{\milli\mole}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\attosecond}
+%\begin{macro}{\femtosecond}
+%\begin{macro}{\picosecond}
+%\begin{macro}{\nanosecond}
+%\begin{macro}{\microsecond}
+%\begin{macro}{\millisecond}
+% Prefixed seconds.
+%    \begin{macrocode}
+\newunit{\attosecond}{\atto\second}
+\newunit{\femtosecond}{\femto\second}
+\newunit{\picosecond}{\pico\second}
+\newunit{\nanosecond}{\nano\second}
+\newunit{\microsecond}{\micro\second}
+\newunit{\millisecond}{\milli\second}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\picoampere}
+%\begin{macro}{\nanoampere}
+%\begin{macro}{\microampere}
+%\begin{macro}{\milliampere}
+%\begin{macro}{\kiloampere}
+% The last prefixed base units are amperes.
+%    \begin{macrocode}
+\newunit{\picoampere}{\pico\ampere}
+\newunit{\nanoampere}{\nano\ampere}
+\newunit{\microampere}{\micro\ampere}
+\newunit{\milliampere}{\milli\ampere}
+\newunit{\kiloampere}{\kilo\ampere}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\millivolt}
+%\begin{macro}{\kilovolt}
+%\begin{macro}{\milliwatt}
+%\begin{macro}{\kilowatt}
+%\begin{macro}{\megawatt}
+%\begin{macro}{\femtofarad}
+%\begin{macro}{\picofarad}
+%\begin{macro}{\nanofarad}
+%\begin{macro}{\microfarad}
+%\begin{macro}{\millifarad}
+%\begin{macro}{\millisiemens}
+% More electricity-related units.
+%    \begin{macrocode}
+\newunit{\millivolt}{\milli\volt}
+\newunit{\kilovolt}{\kilo\volt}
+\newunit{\milliwatt}{\milli\watt}
+\newunit{\kilowatt}{\kilo\watt}
+\newunit{\megawatt}{\mega\watt}
+\newunit{\femtofarad}{\femto\farad}
+\newunit{\picofarad}{\pico\farad}
+\newunit{\nanofarad}{\nano\farad}
+\newunit{\microfarad}{\micro\farad}
+\newunit{\millifarad}{\milli\farad}
+\newunit{\millisiemens}{\milli\siemens}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\kiloohm}
+%\begin{macro}{\megaohm}
+%\begin{macro}{\gigaohm}
+% For resistance, checks are needed again for the definition of
+% \cs{ohm}.
+%    \begin{macrocode}
+\ifsi@old@OHM
+  \newunit{\kiloohm}{\kilo\Ohm}
+  \newunit{\megaohm}{\mega\Ohm}
+  \newunit{\gigaohm}{\giga\Ohm}
+\else
+  \ifsi@gensymb\else
+  \newunit{\kiloohm}{\kilo\ohm}
+  \newunit{\megaohm}{\mega\ohm}
+  \newunit{\gigaohm}{\giga\ohm}
+  \fi
+\fi
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\microlitre}
+%\begin{macro}{\millilitre}
+%\begin{macro}{\cubicmetre}
+%\begin{macro}{\cubiccentimetre}
+%\begin{macro}{\centimetrecubed}
+%\begin{macro}{\cubicmicrometre}
+%\begin{macro}{\cubicmillimetre}
+%\begin{macro}{\cubicdecimetre}
+% Volumes (unlike \unitsdef, with litre and metre spelled
+% correctly).  \cs{millilitre} and \cs{microlitre} are defined
+% as they are the two officially-sanctioned prefixes for the litre.
+%    \begin{macrocode}
+\newunit{\microlitre}{\micro\litre}
+\newunit{\millilitre}{\milli\litre}
+\newunit{\cubicmetre}{\metre\cubed}
+\newunit{\cubiccentimetre}{\centi\metre\cubed}
+\newunit{\centimetrecubed}{\centi\metre\cubed}
+\newunit{\cubicmicrometre}{\micro\metre\cubed}
+\newunit{\cubicmillimetre}{\milli\metre\cubed}
+\newunit{\cubicdecimetre}{\cubic\deci\metre}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\squaremetre}
+%\begin{macro}{\squarecentimetre}
+%\begin{macro}{\centimetresquared}
+%\begin{macro}{\squarekilometre}
+% Areas, with metre spelled corrected; \cs{are} and \cs{hectare} are
+% in the ``temporarily accepted'' file.
+%    \begin{macrocode}
+\newunit{\squaremetre}{\Square\metre}
+\newunit{\squarecentimetre}{\Square\centi\metre}
+\newunit{\centimetresquared}{\centi\metre\squared}
+\newunit{\squarekilometre}{\Square\kilo\metre}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\millijoule}
+%\begin{macro}{\kilojoule}
+%\begin{macro}{\megajoule}
+%\begin{macro}{\millielectronvolt}
+%\begin{macro}{\kiloelectronvolt}
+%\begin{macro}{\megaelectronvolt}
+%\begin{macro}{\gigaelectronvolt}
+%\begin{macro}{\teraelectronvolt}
+%\begin{macro}{\kilowatthour}
+% Some energy is needed by now!  Notice the definition of
+% \cs{kilowatthour}
+%    \begin{macrocode}
+\newunit{\millijoule}{\milli\joule}
+\newunit{\kilojoule}{\kilo\joule}
+\newunit{\megajoule}{\mega\joule}
+\newunit{\millielectronvolt}{\milli\electronvolt}
+\newunit{\kiloelectronvolt}{\kilo\electronvolt}
+\newunit{\megaelectronvolt}{\mega\electronvolt}
+\newunit{\gigaelectronvolt}{\giga\electronvolt}
+\newunit{\teraelectronvolt}{\tera\electronvolt}
+\newunit[unitsep=none]{\kilowatthour}{\kilo\watt\hour}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\millihertz}
+%\begin{macro}{\kilohertz}
+%\begin{macro}{\megahertz}
+%\begin{macro}{\gigahertz}
+%\begin{macro}{\terahertz}
+% Frequencies.
+%    \begin{macrocode}
+\newunit{\millihertz}{\milli\hertz}
+\newunit{\kilohertz}{\kilo\hertz}
+\newunit{\megahertz}{\mega\hertz}
+\newunit{\gigahertz}{\giga\hertz}
+\newunit{\terahertz}{\tera\hertz}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\millinewton}
+%\begin{macro}{\kilonewton}
+%\begin{macro}{\hectopascal}
+%\begin{macro}{\megabecquerel}
+%\begin{macro}{\millisievert}
+% A few more from various areas.
+%    \begin{macrocode}
+\newunit{\millinewton}{\milli\newton}
+\newunit{\kilonewton}{\kilo\newton}
+\newunit{\hectopascal}{\hecto\pascal}
+\newunit{\megabecquerel}{\mega\becquerel}
+\newunit{\millisievert}{\milli\sievert}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\iffalse
+%</prefixed>
+%<*abbr>
+%\fi
+%\subsection{Abbreviated units}
+%\begin{macro}{\pA}
+%\begin{macro}{\nA}
+%\begin{macro}{\micA}
+%\begin{macro}{\mA}
+%\begin{macro}{\kA}
+% The abbreviated units are sorted in one file.  To allow
+% back-compatibility with \unitsdef, each one is inside an \cs{if}
+% block for the appropriate option.  First currents.
+%    \begin{macrocode}
+\ProvidesFile{si-abbr.cfg}
+  [\csname si@svn@version\endcsname siunitx: Abbreviated units]
+\requiresiconfigs{prefix,named,accepted,physical}
+\newunit{\pA}{\pico\ampere}
+\newunit{\nA}{\nano\ampere}
+\newunit{\micA}{\micro\ampere}
+\newunit{\mA}{\milli\ampere}
+\newunit{\kA}{\kilo\ampere}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\Hz}
+%\begin{macro}{\mHz}
+%\begin{macro}{\kHz}
+%\begin{macro}{\MHz}
+%\begin{macro}{\GHz}
+%\begin{macro}{\THz}
+% Then frequencies.
+%    \begin{macrocode}
+\newunit{\Hz}{\hertz}
+\newunit{\mHz}{\milli\hertz}
+\newunit{\kHz}{\kilo\hertz}
+\newunit{\MHz}{\mega\hertz}
+\newunit{\GHz}{\giga\hertz}
+\newunit{\THz}{\tera\hertz}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\fmol}
+%\begin{macro}{\pmol}
+%\begin{macro}{\nmol}
+%\begin{macro}{\micmol}
+%\begin{macro}{\mmol}
+% Amounts of substance.
+%    \begin{macrocode}
+\newunit{\fmol}{\femto\mole}
+\newunit{\pmol}{\pico\mole}
+\newunit{\nmol}{\nano\mole}
+\newunit{\micmol}{\micro\mole}
+\newunit{\mmol}{\milli\mole}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\kV}
+%\begin{macro}{\mV}
+% Potentials.
+%    \begin{macrocode}
+\newunit{\kV}{\kilo\volt}
+\newunit{\mV}{\milli\volt}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ml}
+%\begin{macro}{\micl}
+%\begin{macro}{\cmc}
+%\begin{macro}{\dmc}
+%\begin{macro}{\cms}
+% Volumes and areas
+%    \begin{macrocode}
+\provideunit{\ml}{\milli\litre}
+\provideunit{\micl}{\micro\litre}
+\newunit{\cmc}{\centi\metre\cubed}
+\newunit{\dmc}{\deci\metre\cubed}
+\newunit{\cms}{\centi\metre\squared}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\kg}
+%\begin{macro}{\fg}
+%\begin{macro}{\pg}
+%\begin{macro}{\nanog}
+%\begin{macro}{\micg}
+%\begin{macro}{\mg}
+%\begin{macro}{\amu}
+% Masses.
+%    \begin{macrocode}
+\newunit{\kg}{\kilo\gram}
+%    \end{macrocode}
+% There is a name clash with \pkg{babel} here in French; hopefully
+% there will not be too many complaints.
+%    \begin{macrocode}
+\provideunit{\fg}{\femto\gram}
+\newunit{\pg}{\pico\gram}
+\newunit{\nanog}{\nano\gram}
+\newunit{\micg}{\micro\gram}
+\newunit{\mg}{\milli\gram}
+\newunit{\amu}{\atomicmass}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\kJ}
+%\begin{macro}{\eV}
+%\begin{macro}{\meV}
+%\begin{macro}{\keV}
+%\begin{macro}{\MeV}
+%\begin{macro}{\GeV}
+%\begin{macro}{\TeV}
+%\begin{macro}{\kWh}
+% Energies.
+%    \begin{macrocode}
+\newunit{\kJ}{\kilo\joule}
+\newunit{\eV}{\electronvolt}
+\newunit{\meV}{\milli\electronvolt}
+\newunit{\keV}{\kilo\electronvolt}
+\newunit{\MeV}{\mega\electronvolt}
+\newunit{\GeV}{\giga\electronvolt}
+\newunit{\TeV}{\tera\electronvolt}
+\newunit[unitsep=none]{\kWh}{\kilo\watt\hour}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\picom}
+%\begin{macro}{\nm}
+%\begin{macro}{\micm}
+%\begin{macro}{\mm}
+%\begin{macro}{\cm}
+%\begin{macro}{\dm}
+%\begin{macro}{\km}
+% Lengths.
+%    \begin{macrocode}
+\newunit{\picom}{\pico\metre}
+\newunit{\nm}{\nano\metre}
+\newunit{\micm}{\micro\metre}
+\newunit{\mm}{\milli\metre}
+\newunit{\cm}{\centi\metre}
+\newunit{\dm}{\deci\metre}
+\newunit{\km}{\kilo\metre}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\Sec}
+%\begin{macro}{\as}
+%\begin{macro}{\fs}
+%\begin{macro}{\ps}
+%\begin{macro}{\ns}
+%\begin{macro}{\mics}
+%\begin{macro}{\ms}
+% Finally, times.
+%    \begin{macrocode}
+\newunit{\Sec}{\second}
+\newunit{\as}{\atto\second}
+\newunit{\fs}{\femto\second}
+%    \end{macrocode}
+% The letter class (and others) define \cs{ps} for postscripts, so
+% \cs{provideunit} is best here.
+%    \begin{macrocode}
+\provideunit{\ps}{\pico\second}
+\newunit{\ns}{\nano\second}
+\newunit{\mics}{\micro\second}
+\newunit{\ms}{\milli\second}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\iffalse
+%</abbr>
+%<*addn>
+%\fi
+%\subsection{Additional (temporary) SI units}
+%\begin{macro}{\angstrom}
+%\begin{macro}{\are}
+%\begin{macro}{\hectare}
+%\begin{macro}{\barn}
+%\begin{macro}{\BAR}
+%\begin{macro}{\bbar}
+%\begin{macro}{\millibar}
+%\begin{macro}{\gal}
+%\begin{macro}{\curie}
+%\begin{macro}{\roentgen}
+%\begin{macro}{\rad}
+%\begin{macro}{\rem}
+% Some units are ``temporarily'' acceptable for use in the SI system.
+% These are defined here, although some are in very general use.
+%    \begin{macrocode}
+\ProvidesFile{si-addn.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   SI Additional units]
+\newunit{\angstrom}{\si@sym@ringA}
+\newunit{\are}{a}
+\newunit{\hectare}{\hecto\are}
+\newunit{\barn}{b}
+\newunit{\BAR}{bar}
+\newunit{\bbar}{bar}
+\newunit{\millibar}{\milli\BAR}
+\newunit{\gal}{Gal}
+\newunit{\curie}{Ci}
+\newunit{\roentgen}{R}
+\newunit{\rad}{rad}
+\newunit{\rem}{rem}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\iffalse
+%</addn>
+%<*accepted>
+%\fi
+%\subsection{Units accepted for use with SI}
+% The units which are accepted but do not fit in the above, plus
+% \cs{percent} which seems to fit into this category.
+%\begin{macro}{\minute}
+%\begin{macro}{\hour}
+%\begin{macro}{\Day}
+%\begin{macro}{\dday}
+%\begin{macro}{\degree}
+%\begin{macro}{\Degree}
+%\begin{macro}{\arcmin}
+%\begin{macro}{\arcsec}
+%\begin{macro}{\litre}
+%\begin{macro}{\liter}
+%\begin{macro}{\tonne}
+%\begin{macro}{\neper}
+%\begin{macro}{\bel}
+%\begin{macro}{\percent}
+%    \begin{macrocode}
+\ProvidesFile{si-accepted.cfg}
+  [\csname si@svn@version\endcsname siunitx: SI Accepted units]
+\newunit{\minute}{min}
+\newunit{\hour}{h}
+\newunit{\Day}{d}
+\newunit{\dday}{d}
+\ifsi@old@OHM
+  \newunit[valuesep=none]{\Degree}{\si@sym@degree}
+\else
+  \ifsi@gensymb\else
+    \newunit[valuesep=none]{\degree}{\si@sym@degree}
+  \fi
+\fi
+\newunit[valuesep=none]{\arcmin}{\si@sym@minute}
+\newunit[valuesep=none]{\arcsec}{\si@sym@second}
+\newunit{\litre}{l}
+\newunit{\liter}{L}
+\newunit{\tonne}{t}
+\newunit{\neper}{Np}
+\newunit{\bel}{B}
+\newunit{\percent}{\%}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\iffalse
+%</accepted>
+%<*physical>
+%\fi
+%\subsection{Units based on physical measurements}
+%\begin{macro}{\si@eVspacea}
+%\begin{macro}{\si@eVspaceb}
+%\begin{macro}{\electronvolt}
+%\begin{macro}{\atomicmassunit}
+%\begin{macro}{\atomicmass}
+% A few units based on physical measurements exist.  For \cs{eV}, the need
+% for a negative kern does make things a bit complicated.
+%    \begin{macrocode}
+\ProvidesFile{si-physical.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   SI Physically-measured units]
+\newcommand*{\si@eVspacea}{\text{\kern-\si@eVcorra}}%
+\newcommand*{\si@eVspaceb}{\text{\kern-\si@eVcorrb}}%
+\newunit{\electronvolt}{e\protect\si@eVspacea V\protect%
+  \si@eVspaceb}
+\newunit{\atomicmass}{u}
+\newunit{\atomicmassunit}{u}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\iffalse
+%</physical>
+%\fi
+%
+%\section{Additional configurations}
+% To provide flexibility for people in specific areas, specialised
+% units can be set up.  These are then stored separately to ease use.
+%
+%\iffalse
+%<*synchem>
+%\fi
+%\subsection{Synthetic chemistry}
+%\begin{macro}{\mmHg}
+%\begin{macro}{\molar}
+%\begin{macro}{\Molar}
+%\begin{macro}{\torr}
+%\begin{macro}{\dalton}
+% Some useful units for synthetic chemists; although \cs{mmHg} and
+% \cs{Molar} are outside of the SI system, they are used a lot.
+% These are set up using \cs{provideunit} as people may have their
+% own definitions.
+%    \begin{macrocode}
+\ProvidesFile{si-synchem.cfg}
+  [\csname si@svn@version\endcsname siunitx: Units for
+     synthetic chemists]
+\requiresiconfigs{prefix}
+\newunit{\mmHg}{mmHg}
+\newunit{\molar}{\mole\per\cubic\deci\metre}
+\newunit{\Molar}{\textsc{m}}
+\newunit{\torr}{Torr}
+\newunit{\dalton}{Da}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\iffalse
+%</synchem>
+%<*hep>
+%\fi
+%\subsection{High-energy physics}
+% Some units inspired by \pkg{hepunits}.
+%    \begin{macrocode}
+\ProvidesFile{si-hep.cfg}
+  [\csname si@svn@version\endcsname siunitx: Units for
+    high-energy physics]
+\requiresiconfigs{prefix,named}
+%    \end{macrocode}
+%\begin{macro}{\micron}
+%\begin{macro}{\mrad}
+%\begin{macro}{\gauss}
+% These specific to high-energy physics, but are not defined
+% elsewhere in \currpkg.\footnote{It is not clear from
+% \pkg{hepunits}, but the assumption is that \cs{mrad} represents
+% millirad and not milliradian.}
+%    \begin{macrocode}
+\provideunit{\micron}{\micro\metre}
+\newunit{\mrad}{\milli\rad}
+\newunit{\gauss}{G}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\clight}
+%\begin{macro}{\eVperc}
+% The speed of light is used in units for the area, although of
+% course it is not strictly a unit.  However, this makes it easier to
+% use in other units.
+%    \begin{macrocode}
+\newunit{\clight}{\ensuremath{\mathnormal{c}}}
+\newunit{\eVperc}{\eV\per\clight}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\nanobarn}
+%\begin{macro}{\picobarn}
+%\begin{macro}{\femtobarn}
+%\begin{macro}{\attobarn}
+%\begin{macro}{\zeptobarn}
+%\begin{macro}{\yoctobarn}
+% Various prefixed barns.
+%    \begin{macrocode}
+\newunit{\nanobarn}{\nano\barn}
+\newunit{\picobarn}{\pico\barn}
+\newunit{\femtobarn}{\femto\barn}
+\newunit{\attobarn}{\atto\barn}
+\newunit{\zeptobarn}{\zepto\barn}
+\newunit{\yoctobarn}{\yocto\barn}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\nb}
+%\begin{macro}{\pb}
+%\begin{macro}{\fb}
+%\begin{macro}{\ab}
+%\begin{macro}{\zb}
+%\begin{macro}{\yb}
+% Abbreviations for the same, but using \cs{provideunit} to avoid any
+% clashes.
+%    \begin{macrocode}
+\provideunit{\nb}{\nano\barn}
+\provideunit{\pb}{\pico\barn}
+\provideunit{\fb}{\femto\barn}
+\provideunit{\ab}{\atto\barn}
+\provideunit{\zb}{\zepto\barn}
+\provideunit{\yb}{\yocto\barn}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\iffalse
+%</hep>
+%<*astro>
+%\fi
+%\subsection{Astronomy}
+%\begin{macro}{\parsec}
+%\begin{macro}{\lightyear}
+% For astronomy, the \cs{parsec} unit is needed.
+%    \begin{macrocode}
+\ProvidesFile{si-astro.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   Units for astronomy]
+\newunit{\parsec}{pc}
+\newunit{\lightyear}{ly}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\iffalse
+%</astro>
+%<*binary>
+%\fi
+%\subsection{Binary units}
+%\begin{macro}{\kibi}
+%\begin{macro}{\mebi}
+%\begin{macro}{\gibi}
+%\begin{macro}{\tebi}
+%\begin{macro}{\pebi}
+%\begin{macro}{\exbi}
+%\begin{macro}{\zebi}
+%\begin{macro}{\yobi}
+% The binary units, as specified by the IEC and made available by
+% \SIunits. First, the binary prefixes.
+%    \begin{macrocode}
+\ProvidesFile{si-binary.cfg}
+  [\csname si@svn@version\endcsname siunitx: Binary units]
+\newprefix[binary]{\kibi}{10}{Ki}
+\newprefix[binary]{\mebi}{20}{Mi}
+\newprefix[binary]{\gibi}{30}{Gi}
+\newprefix[binary]{\tebi}{40}{Ti}
+\newprefix[binary]{\pebi}{50}{Pi}
+\newprefix[binary]{\exbi}{60}{Ei}
+\newprefix[binary]{\zebi}{70}{Zi}
+\newprefix[binary]{\yobi}{80}{Yi}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\bit}
+%\begin{macro}{\byte}
+% Now the units.
+%    \begin{macrocode}
+\newunit{\bit}{bit}
+\newunit{\byte}{B}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%
+%\iffalse
+%</binary>
+%\fi
+%
+%\section{Loadable locales}
+% Some short files to provide the correct settings for various places.
+%
+%\iffalse
+%<*UK>
+%\fi
+%\subsection{United Kingdom}
+% This is identical to the USA locale, and contains the package
+% default values.\footnote{The package author is in the UK.}
+%    \begin{macrocode}
+\ProvidesFile{si-UK.cfg}
+  [\csname si@svn@version\endcsname siunitx: UK locale]
+\sisetup{
+  unitsep=thin,
+  expproduct=times,
+  valuesep=thin,
+  decimalsymbol=fullstop,
+  digitsep=thin,
+  sepfour=false}
+%    \end{macrocode}
+%\iffalse
+%</UK>
+%<*USA>
+%\fi
+%\subsection{United States}
+% The same as for the UK.
+%    \begin{macrocode}
+\ProvidesFile{si-USA.cfg}
+  [\csname si@svn@version\endcsname siunitx: USA locale]
+\sisetup{
+  unitsep=thin,
+  expproduct=times,
+  valuesep=thin,
+  decimalsymbol=fullstop,
+  digitsep=thin,
+  sepfour=false}
+%    \end{macrocode}
+%\iffalse
+%</USA>
+%<*DE>
+%\fi
+%\subsection{Germany}
+% Germany, hopefully.
+%    \begin{macrocode}
+\ProvidesFile{si-DE.cfg}
+  [\csname si@svn@version\endcsname siunitx: Germany locale]
+\sisetup{
+  unitsep=cdot,
+  valuesep=thin,
+  decimalsymbol=comma,
+  expproduct=cdot,
+  digitsep=thin,
+  sepfour=false}
+%    \end{macrocode}
+%\iffalse
+%</DE>
+%<*ZA>
+%\fi
+%\subsection{South Africa}
+% Design decisions taken from the same section of \SIstyle.
+%    \begin{macrocode}
+\ProvidesFile{si-ZA.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   South Africa locale]
+\sisetup{
+  unitsep=cdot,
+  valuesep=thin,
+  expproduct=times,
+  decimalsymbol=comma,
+  digitsep=thin,
+  sepfour=false}
+%    \end{macrocode}
+%\iffalse
+%</ZA>
+%\fi
+%
+%\section{Emulation code}
+% Each emulation mode loads an appropriate definition file.  This
+% then alters the package defaults, and defines new macros provided
+% by the emulated package.
+%
+%\iffalse
+%<*units>
+%\fi
+%\subsection{\units}
+% The very first thing to do here is a reload check, as things
+% could go wrong with \unitsdef emulation.
+%    \begin{macrocode}
+\si@ifloaded{units}{\endinput}{}
+%    \end{macrocode}
+% The \units package is quite easy to emulate, as it only has a
+% few options and macros. There is also no error checking in
+% \units for conflicting options, so users probably expect none.
+%    \begin{macrocode}
+\ProvidesFile{si-units.cfg}
+  [\csname si@svn@version\endcsname siunitx: Emulation of units]
+\si@emulating{units}{1998/08/04 v0.9b}
+\si@ifloaded{SIunits}
+  {\si@emclash{units}{SIunits}\endinput}{}
+\si@ifloaded{sistyle}
+  {\si@emclash{units}{sistyle}\endinput}{}
+%    \end{macrocode}
+% To emulate \units, \cs{per} must give fractions.
+%    \begin{macrocode}
+\sisetup{per=fraction,fraction=nice,obeybold,inlinebold=maths,
+  ,obeymode}
+\ifsi@old@tight
+  \sisetup{valuesep=thin}
+\fi
+\ifsi@old@loose
+  \sisetup{valuesep=space}
+\fi
+\ifsi@old@ugly
+  \sisetup{fraction=ugly}
+\fi
+%    \end{macrocode}
+%\begin{macro}{\unit}
+% The \units version of \cs{unit} is similar to \cs{SI}.  Here and
+% in \cs{unitfrac} the \cs{num} macro is used; thus the number given
+% really has to be a number.  However, if users are using \currpkg
+% rather than \units they should expect more checking of input.  As
+% the \units package uses the current mode, this has to be
+% detected.\\
+%\cs{unit}\oarg{num}\marg{unit}
+%    \begin{macrocode}
+\si@newrobustcmd*{\unit}[2][]{%
+  \ifmmode
+    \SI{#1}{#2}%
+  \else
+    \SI[obeyfamily,obeyitalic]{#1}{#2}%
+  \fi}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\unitfrac}
+% \cs{unitfrac} is a bit more of a hack.\\
+%\cs{unitfrac}\oarg{num}\marg{numerator}\marg{denominator}
+%    \begin{macrocode}
+\si@newrobustcmd*{\unitfrac}[3][]{%
+  \begingroup
+    \si@fam@mode%
+    \ifmmode\else
+      \sisetup{obeyfamily,obeyitalic}%
+    \fi
+    \si@ifnotmtarg{#1}
+      {\num{#1}\ensuremath{\si@valuesep}}%
+    \si@frac{#2}{#3}
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\iffalse
+%</units>
+%\fi
+%\iffalse
+%<*unitsdef>
+%\fi
+%\subsection{\unitsdef}
+% The package begins with the usual identification of what is
+% happening.  Although \file{si-units.cfg} makes the same checks,
+% the error will make more sense if it comes here, in the event of a
+% clash.
+%    \begin{macrocode}
+\ProvidesFile{si-unitsdef.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   Emulation of unitsdef]
+\si@emulating{unitsdef}{2005/01/04 v0.2}
+\si@ifloaded{SIunits}
+  {\si@emclash{unitsdef}{SIunits}\endinput}{}
+\si@ifloaded{sistyle}
+  {\si@emclash{unitsdef}{sistyle}\endinput}{}
+%    \end{macrocode}
+% Emulation of \units is needed for \unitsdef to work.
+%    \begin{macrocode}
+\requiresiconfigs{units}
+%    \end{macrocode}
+% The \unitsdef package loads some packages that \currpkg does not.
+% In particular, it loads \pkg{textcomp} and \pkg{fontenc}.  This
+% could be important for output, and so the same is done here.
+%    \begin{macrocode}
+\RequirePackage{textcomp}
+\RequirePackage[T1]{fontenc}
+%    \end{macrocode}
+% The multitude of package options for \unitsdef need to be handled.
+%    \begin{macrocode}
+\sisetup{mode=text,allowoptarg,prespace}
+\ifsi@old@noxspace
+  \sisetup{xspace=false}
+\fi
+%    \end{macrocode}
+% The various options for loading unit abbreviations have to be
+% handled. Here, any request to avoid abbreviations prevents any
+% loading.
+%    \begin{macrocode}
+\ifsi@old@noabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@nofrequncyabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@nomolabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@novoltageabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@novolumeabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@noweightabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@noenergyabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@nolengthabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@notimeabbr
+  \sisetup{noload=abbr}
+\fi
+%    \end{macrocode}
+%\begin{macro}{\unitvaluesep}
+% To emulate the \cs{unitvaluesep} macro, a hack is needed of the original
+% \pkg{xkeyval} macro for \opt{valuesep}, as well of course as a definition
+% of the macro itself.
+%    \begin{macrocode}
+\newcommand*{\unitvaluesep}{\,}
+\renewcommand*{\si@valuesep}{\text{\unitvaluesep}}
+\define@choicekey*+[si]{key}{valuesep}[\si@tempa]
+  {space,thin,med,medium,thick,none}
+  {\renewcommand*\unitvaluesep\@nameuse{si@fix@##1}%
+   \si@log@debug{Option valuesep set to ##1}}
+  {\si@log@debug{Option valuesep set to ##1}%
+   \renewcommand*\unitvaluesep{##1}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\unitsignonly}
+%\begin{macro}{\ilu}
+%\begin{macro}{\arc}
+% Some rather straight-forward definitions, with just a bit of fun to
+% get the spacing correct.
+%    \begin{macrocode}
+\let\unitsignonly\si
+\si@newrobustcmd*{\ilu}[2][]{%
+  \begingroup
+    #1\unitvaluesep%
+    \unit{#2}%
+  \endgroup}
+\let\arc\ang
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\unitSIdef}
+%\begin{macro}{\si@unitSIdef}
+% The \unitsdef package uses a different approach to setting the font
+% inside its version of \cs{SI}.  The problem is the same as for
+% \cs{unitvaluesep}, but with the added problem that \currpkg uses
+% \cs{csname} \ldots \cs{endcsname}.
+%    \begin{macrocode}
+\newcommand*{\unitSIdef}{\upshape}
+\newcommand*{\si@unitSIdef}{\unitSIdef\selectfont}
+\sisetup{textrm=si@unitSIdef}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\per}
+% Rather awkwardly, \unitsdef uses \cs{per} in a different way to
+% \currpkg.
+%    \begin{macrocode}
+\let\per\relax
+\si@newrobustcmd*{\per}[2]{%
+  \begingroup
+    \si@xspacefalse
+    \renewcommand*{\unitvaluesep}{}%
+    \unitfrac{#1}{#2}%
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\unittimes}
+%\begin{macro}{\unitsep}
+%\begin{macro}{\unitsuperscript}
+% Some pretty straight-forward stuff again; notice that the automatic
+% analyser for units has to be turned off for this to work.
+%    \begin{macrocode}
+\newcommand*{\unittimes}{\ensuremath{\cdot}}
+\newcommand*{\unitsep}{\,}
+\renewcommand*{\si@unt@unithook}{\si@unt@litouttrue}
+\sisetup{unitsep=none}
+\newcommand*{\unitsuperscript}{\tothe}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\newnosepunit}
+%\begin{macro}{\renewnosepunit}
+% Simple aliases.
+%    \begin{macrocode}
+\newcommand*{\newnosepunit}{\newunit[valuesep=none]}
+\newcommand*{\renewnosepunit}{\renewunit[valuesep=none]}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\setTextOmega}
+%\begin{macro}{\setMathOmega}
+%\begin{macro}{\setTextmu}
+%\begin{macro}{\setMathmu}
+%\begin{macro}{\setTextCelsius}
+%\begin{macro}{\setMathCelsius}
+%\begin{macro}{\setMathDegree}
+%\begin{macro}{\setTextDegree}
+% Controlling symbols is a simple translation job; as only one
+% setting is used by \currpkg in text mode, a bit of extra work is
+% needed.
+%    \begin{macrocode}
+\newcommand*{\setTextOmega}[2]{%
+  \renewcommand*{\si@textOmega}{%
+      \begingroup
+      \edef\si@tempa{\sfdefault}%
+      \ifx\f@family\si@tempa
+        \expandafter#2%
+      \else
+        \expandafter#1%
+      \fi
+    \endgroup}}
+\newcommand*{\setMathOmega}[1]{\sisetup{mathsOmega=#1}}
+\newcommand*{\setTextmu}[2]{%
+  \renewcommand*{\si@textmu}{%
+    \begingroup
+      \edef\si@tempa{\sfdefault}%
+      \ifx\f@family\si@tempa
+        \expandafter#2%
+      \else
+        \expandafter#1%
+      \fi
+    \endgroup}}
+\newcommand*{\setMathmu}[1]{\sisetup{mathsmu=#1}}
+\newcommand*{\setTextCelsius}[2]{%
+  \renewcommand*{\si@textcelsius}{%
+    \begingroup
+      \edef\si@tempa{\sfdefault}%
+      \ifx\f@family\si@tempa
+        \expandafter#2%
+      \else
+        \expandafter#1%
+      \fi
+    \endgroup}}
+\newcommand*{\setMathCelsius}[1]{\sisetup{mathscelsius=#1}}
+\newcommand*{\setMathDegree}[2]{%
+  \renewcommand*{\si@textdegree}{%
+    \begingroup%
+      \edef\si@tempa{\sfdefault}%
+      \ifx\f@family\si@tempa
+        \expandafter#2%
+      \else
+        \expandafter#1%
+      \fi
+    \endgroup}}
+\newcommand*{\setTextDegree}[1]{\sisetup{textdegree=#1}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+% The \opt{ohm} and \opt{OHM} options are checked, and some sanity is
+% ensured.  This needs to happen before loading the configuration
+% files.
+%    \begin{macrocode}
+\ifsi@old@OHM
+  \ifsi@old@ohm
+    \si@log@inf{Both `ohm' and `OHM' options given\MessageBreak
+      Using default behaviour for unitsdef}
+    \expandafter\expandafter\expandafter\si@old@OHMfalse
+  \fi
+\fi
+%    \end{macrocode}
+%\begin{macro}{\liter}
+%\begin{macro}{\ton}
+%\begin{macro}{\days}
+% Tonne is spelled as ``ton'' by \unitsdef, which is wrong in the UK
+% at least (\SI{1}{ton} $=$ \SI{40}{cwt} $=$ \SI{2240}{lb}!).
+%    \begin{macrocode}
+\ifsi@old@liter
+  \ifsi@old@LITER
+    \si@log@inf{Both `liter' and `LITER' options
+      given\MessageBreak Using default behaviour for unitsdef}
+  \else
+    \renewunit{\liter}{l}
+  \fi
+\fi
+\newunit{\ton}{t}
+\newunit{\days}{d}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\picometer}
+%\begin{macro}{\nanometer}
+%\begin{macro}{\micrometer}
+%\begin{macro}{\millimeter}
+%\begin{macro}{\centimeter}
+%\begin{macro}{\decimeter}
+%\begin{macro}{\kilometer}
+% Extra distances.
+%    \begin{macrocode}
+\newunit{\picometer}{\pico\meter}
+\newunit{\nanometer}{\nano\meter}
+\newunit{\micrometer}{\micro\meter}
+\newunit{\millimeter}{\milli\meter}
+\newunit{\centimeter}{\centi\meter}
+\newunit{\decimeter}{\deci\meter}
+\newunit{\kilometer}{\kilo\meter}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\femtoliter}
+%\begin{macro}{\picoliter}
+%\begin{macro}{\nanoliter}
+%\begin{macro}{\microliter}
+%\begin{macro}{\milliliter}
+%\begin{macro}{\centiliter}
+%\begin{macro}{\deciliter}
+%\begin{macro}{\hectoliter}
+%\begin{macro}{\cubicmeter}
+%\begin{macro}{\cubicmicrometer}
+%\begin{macro}{\cubicmillimeter}
+% Volumes with US spellings.
+%    \begin{macrocode}
+\newunit{\femtoliter}{\femto\liter}
+\newunit{\picoliter}{\pico\liter}
+\newunit{\nanoliter}{\nano\liter}
+\newunit{\microliter}{\micro\liter}
+\newunit{\milliliter}{\milli\liter}
+\newunit{\centiliter}{\centi\liter}
+\newunit{\deciliter}{\deci\liter}
+\newunit{\hectoliter}{\hecto\liter}
+\newunit{\cubicmeter}{\meter\cubed}
+\newunit{\cubicmicrometer}{\micro\meter\cubed}
+\newunit{\cubicmillimeter}{\milli\meter\cubed}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\squaremeter}
+%\begin{macro}{\squarecentimeter}
+%\begin{macro}{\squarekilometer}
+%\begin{macro}{\ar}
+%\begin{macro}{\hectar}
+% Areas, including the mis-spellings for \cs{are} and
+% \cs{hectare}.
+%    \begin{macrocode}
+\newunit{\squaremeter}{\Square\meter}
+\newunit{\squarecentimeter}{\Square\centi\meter}
+\newunit{\squarekilometer}{\Square\kilo\meter}
+\newunit{\ar}{a}
+\newunit{\hectar}{\hecto\ar}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\kv}
+%\begin{macro}{\mv}
+% The code for \unitsdef has the capitalisation wrong for \cs{kV} and
+% \cs{mV}.
+%    \begin{macrocode}
+\ifsi@old@noabbr
+\else
+  \ifsi@old@novoltageabbr\else
+    \newunit{\kv}{\kilo\volt}
+    \newunit{\mv}{\milli\volt}
+  \fi
+\fi
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\sek}
+%\begin{macro}{\fg}
+%\begin{macro}{\fl}
+%\begin{macro}{\pl}
+%\begin{macro}{\nl}
+%\begin{macro}{\micl}
+%\begin{macro}{\ml}
+%\begin{macro}{\cl}
+%\begin{macro}{\dl}
+%\begin{macro}{\hl}
+% There are some slightly different abbreviations, plus some which
+% are not officially allowed.
+%    \begin{macrocode}
+\ifsi@old@noabbr\else
+  \ifsi@old@notimeabbr\else
+    \newunit{\sek}{\second}
+  \fi
+  \ifsi@old@noweightabbr\else
+    \newunit{\fg}{\femto\gram}
+  \fi
+  \ifsi@old@novolumeabbr\else
+    \newunit{\fl}{\femto\liter}
+    \newunit{\pl}{\pico\liter}
+    \newunit{\nl}{\nano\liter}
+    \newunit{\micl}{\micro\liter}
+    \newunit{\ml}{\milli\liter}
+    \newunit{\cl}{\centi\liter}
+    \newunit{\dl}{\deci\liter}
+    \newunit{\hl}{\hecto\liter}
+  \fi
+\fi
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\calory}
+%\begin{macro}{\kilocalory}
+% \unitsdef spells calorie incorrectly, and it is also not an SI unit.
+%    \begin{macrocode}
+\newunit{\calory}{cal}
+\newunit{\kilocalory}{\kilo\calory}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\uBar}
+% \unitsdef uses \cs{ubar} for bar.
+%    \begin{macrocode}
+\newunit{\uBar}{ba}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\gensymbohm}
+%\begin{macro}{\gensymbcelsius}
+%\begin{macro}{\gensymbmicro}
+%\begin{macro}{\gensymbdegree}
+% If the options relating to \pkg{gensymb} are given, then the
+% package \emph{has} to be loaded.  The definitions are then renamed;
+% a slight awkward feature is that the hyphen character needs to be a
+% letter.  To avoid needing to worry about this again, a second
+% switch is set up.
+%    \begin{macrocode}
+\catcode`\-=11\relax
+\ifsi@old@redef-gensymb
+  \expandafter\si@gensymbtrue
+\fi
+\catcode`\-=12\relax
+\ifsi@gensymb
+  \RequirePackage{gensymb}
+  \AtBeginDocument{
+    \let\gensymbohm\ohm
+    \let\gensymbcelsius\celsius
+    \let\gensymbmicro\micro
+    \let\gensymbdegree\degree
+    \let\ohm\@undefined
+    \let\celsius\@undefined
+    \let\micro\@undefined
+    \let\degree\@undefined
+    \ifsi@old@OHM\else
+      \newunit{\ohm}{\si@sym@Omega}
+      \newunit{\celsius}{\si@sym@celsius}
+      \newprefix{\micro}{\si@sym@mu}{-6}
+      \newunit{\degree}{\si@sym@degree}
+    \fi}
+\fi
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+% The configuration files can now be loaded.
+%    \begin{macrocode}
+\requiresiconfigs{prefix,named,addn,accepted}
+%    \end{macrocode}
+% The \opt{noconfig} option could be ignored, but it costs little to
+% let is be used.
+%    \begin{macrocode}
+\ifsi@old@noconfig\else
+  \InputIfFileExists{unitsdef.cfg}
+    {\si@log@inf{unitsdef config file loaded}}
+    {\si@log@inf{unitsdef config file not found}}
+\fi
+%    \end{macrocode}
+%
+%\iffalse
+%</unitsdef>
+%<*sistyle>
+%\fi
+%\subsection{\SIstyle}
+% After setting the necessary defaults, the emulation code defines
+% the macros in \SIstyle as given in the manual for that package.
+%    \begin{macrocode}
+\ProvidesFile{si-sistyle.cfg}
+  [\csname si@svn@version\endcsname siunitx: Emulation of
+     SIstyle]
+\si@emulating{sistyle}{2006/12/20 v2.3}
+\sisetup{%
+  sepfour=true,
+  obeyfamily,
+  obeyitalic=true,
+  numsign=+-,
+  strictarc=false,
+  unitsep=cdot}
+%    \end{macrocode}
+%\begin{macro}{\SIobeyboldtrue}
+%\begin{macro}{\SIobeyboldfalse}
+% Some simple switches, but not using \cs{newif}.
+%    \begin{macrocode}
+\newcommand*{\SIobeyboldtrue}{\sisetup{obeybold=true}}
+\newcommand*{\SIobeyboldfalse}{\sisetup{obeybold=false}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\num}
+%\begin{macro}{\si@sis@num}
+%\begin{macro}{\si@sis@numstar}
+% To get the correct behaviour for \cs{num}, some redefinitions are
+% needed to handle to optional |*|.
+%    \begin{macrocode}
+\let\num\relax
+\si@newrobustcmd*{\num}{%
+  \@ifstar
+    {\si@sis@numstar}
+    {\si@sis@num}}
+\newcommand*{\si@sis@num}[2][]{%
+  \begingroup%
+    \sisetup{#1}%
+    \expandafter\si@out@num\expandafter{\si@num{#2}}%
+  \endgroup}
+\newcommand*{\si@sis@numstar}[2][]{%
+  \begingroup%
+    \sisetup{mode=text,obeybold}%
+    \sisetup{#1}%
+    \expandafter\si@out@num\expandafter{\si@num{#2}}%
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\pnt}
+% The \cs{pnt} macro is needed as |.| is active inside \cs{SI}.  The
+% name is exactly the same as in \SIstyle, but the implementation is
+% different.  This is not defined by the main package as there are
+% better ways of including numbers in the output than this.
+%    \begin{macrocode}
+\newcommand*{\pnt}{\ensuremath{\si@decimalsymbol}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\SIgroupfourtrue}
+%\begin{macro}{\SIgroupfourfalse}
+% Switches for grouping four characters.
+%    \begin{macrocode}
+\newcommand*{\SIgroupfourtrue}{\sisetup{sepfour=true}}
+\newcommand*{\SIgroupfourfalse}{\sisetup{sepfour=false}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\SIunitsep}
+%\begin{macro}{\SIunitspace}
+%\begin{macro}{\SIunitdot}
+% Whatever is given here is passed through to \cs{sisetup}.
+%    \begin{macrocode}
+\newcommand*{\SIunitsep}[1]{\sisetup{valuesep={#1}}}
+\newcommand*{\SIunitspace}[1]{\sisetup{unitspace={#1}}}
+\newcommand*{\SIunitdot}[1]{\sisetup{unitsep={#1}}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\SIdecimalsymbol}
+%\begin{macro}{\SIthousandsep}
+%\begin{macro}{\SIproductsign}
+%\begin{macro}{\SIdecimalsign}
+% The same is true here, with the appropriate translation.
+%    \begin{macrocode}
+\newcommand*{\SIdecimalsymbol}[1]{\sisetup{decimalsymbol={#1}}}
+\newcommand*{\SIthousandsep}[1]{\sisetup{digitsep={#1}}}
+\newcommand*{\SIproductsign}[1]{\sisetup{expproduct={#1}}}
+\newcommand*{\SIdecimalsign}[1]{\sisetup{decimalsymbol={#1}}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\si@sis@savefont}
+% The font definitions need a bit of extra work doing.  As both
+% settings here have |@| as a letter, all should be fine.\\
+%\cs{si@sis@savefont}\marg{setting}\marg{argument}
+%    \begin{macrocode}
+\newcommand*{\si@sis@savefont}[2]{%
+  \@namedef{si@sis@#1}{#2}%
+  \sisetup{#1=si@sis@#1}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\SImathrm}
+%\begin{macro}{\SImathsf}
+%\begin{macro}{\SImathtt}
+% The font control macros have to ensure that a macro name is passed
+% to \cs{sisetup}.
+%    \begin{macrocode}
+\newcommand*{\SImathrm}[1]{\si@sis@savefont{mathrm}{#1}}
+\newcommand*{\SImathsf}[1]{\si@sis@savefont{mathsf}{#1}}
+\newcommand*{\SImathtt}[1]{\si@sis@savefont{mathtt}{#1}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\SIdefaultMfam}
+%\begin{macro}{\SIdefaultNfam}
+%\begin{macro}{\SIdefaultTfam}
+% The same for the default keys.
+%    \begin{macrocode}
+\newcommand*{\SIdefaultMfam}[1]{\si@sis@savefont{mathrm}{#1}}
+\newcommand*{\SIdefaultNfam}[1]{\si@sis@savefont{mathnumrm}{#1}}
+\newcommand*{\SIdefaultTfam}[1]{\si@sis@savefont{textrm}{#1}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\ensureupmath}
+% The \cs{ensureupmath} command guarantees processing by the
+% font-matching system. The argument cannot be processed here, so
+% care is needed.
+%    \begin{macrocode}
+\si@newrobustcmd*{\ensureupmath}[1]{%
+  \begingroup
+    \sisetup{mode=maths,obeyitalic=false}%
+    \si@out{#1}%
+  \endgroup}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\degC}
+%\begin{macro}{\degF}
+%\begin{macro}{\arcdeg}
+% A few extra symbol names are needed.
+%    \begin{macrocode}
+\newcommand*{\degC}{\si@sym@celsius}
+\newcommand*{\arcdeg}{\si@sym@degree}
+\newcommand*{\degF}{\si@sym@degree F}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\AddToSIstyle}
+%\begin{macro}{\SIstyle}
+%\begin{macro}{\SIstyleToLang}
+%\begin{macro}{\si@sis@addtolocale}
+% Finally, the locale control.
+%    \begin{macrocode}
+\newcommand*{\SIstyle}[1]{\sisetup{locale=#1}}
+\newcommand*{\SIstyleToLang}[2]{\sisetup{loctolang=#1:#2}}
+\newcommand*{\AddToSIstyle}{%
+  \si@switchfalse
+  \@ifstar
+    {\si@switchtrue
+     \si@sis@addtolocale}
+    {\si@sis@addtolocale}}
+\newcommand*{\si@sis@addtolocale}[2]{%
+  \ifsi@switch
+    \expandafter\let\csname si@loc@#1@extra\endcsname\relax
+  \fi
+  \addtolocale{#1}{#2}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%
+%\iffalse
+%</sistyle>
+%<*SIunits>
+%\fi
+%\subsection{\SIunits}
+% \SIunits emulation starts in much the same way.
+%    \begin{macrocode}
+\ProvidesFile{si-SIunits.cfg}
+  [\csname si@svn@version\endcsname siunitx: Emulation of
+     SIunits]
+\si@emulating{SIunits}{2007/12/02 v1.36}
+\sisetup{
+  unitsep=thick,
+  valuesep=thick,
+  prefixproduct=\si@valuesep,
+  trapambigfrac=false,
+  stickyper}
+\requiresiconfigs{prefix,named,accepted,physical}
+%    \end{macrocode}
+%\begin{macro}{\reciprocal}
+%\begin{macro}{\rp}
+%\begin{macro}{\per}
+%\begin{macro}{\usk}
+%\begin{macro}{\power}
+%\begin{macro}{\rpsquare}
+%\begin{macro}{\rpcubic}
+%\begin{macro}{\fourth}
+%\begin{macro}{\rpfourth}
+% A few very simple translations, using the internal version of
+% \cs{per} to allow changes of output style.
+%    \begin{macrocode}
+\newcommand*{\reciprocal}{\sisetup{per=reciprocal}\si@per}
+\let\rp\reciprocal
+\renewcommand*{\per}{\sisetup{per=slash}\si@per}
+\newcommand*{\usk}{}
+\newcommand*{\power}[1]{#1\tothe}
+\newcommand*{\rpsquare}{\sisetup{per=reciprocal}\si@per\Square}
+\newcommand*{\rpcubic}{\sisetup{per=reciprocal}\si@per\cubic}
+\newpower{\fourth}{4}
+\newcommand*{\rpfourth}{\sisetup{per=reciprocal}\si@per\fourth}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\rpsquared}
+%\begin{macro}{\rpcubed}
+% Here, some low-level switch changing is needed.
+%    \begin{macrocode}
+\newcommand*{\rpsquared}{%
+  \sisetup{per=reciprocal}\si@unt@pertrue\si@unt@perseentrue%
+    \squared}
+\newcommand*{\rpcubed}{%
+  \sisetup{per=reciprocal}\si@unt@pertrue\cubed}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\SIsetup}
+%\begin{macro}{\si@siu@setup}
+% The various package spacing options are processed.  They also have
+% to be correctly handled by the \cs{SIsetup} macro.
+%    \begin{macrocode}
+\newcommand*{\SIsetup}[1]{%
+  \@for\si@tempa:=#1\do{%
+    \@ifundefined{ifsi@old@#1}
+      {\si@log@warn{Unknown SIunits option `#1'}}
+      {\csname si@old@#1true\endcsname}}
+  \si@siu@setup}
+\newcommand*{\si@siu@setup}{%
+  \ifsi@old@cdot
+    \sisetup{unitsep=cdot}%
+  \fi
+  \ifsi@old@thickspace
+    \sisetup{unitsep=thick}%
+  \fi
+  \ifsi@old@mediumspace
+    \sisetup{unitsep=medium}%
+  \fi
+  \ifsi@old@thinspace
+    \sisetup{unitsep=thin}%
+  \fi
+  \ifsi@old@thickqspace
+    \sisetup{valuesep=thick}%
+  \fi
+  \ifsi@old@mediumqspace
+    \sisetup{valuesep=medium}%
+  \fi
+  \ifsi@old@thinqspace
+    \sisetup{valuesep=thin}%
+  \fi}
+\si@siu@setup
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\square}
+%\begin{macro}{\squaren}
+% \SIunits does slightly different things about the clash with
+% \cs{square}, and either redefines this macro or provides
+% \cs{squaren}.
+%    \begin{macrocode}
+\ifsi@old@squaren
+  \newpower{\squaren}{2}
+\fi
+\AtBeginDocument{%
+  \@ifundefined{square}
+    {\newpower{\square}{2}}
+    {\ifsi@old@amssymb
+       \renewpower{\square}{2}
+     \else
+       \ifsi@old@squaren\else
+         \si@log@warn{\string\square\space already
+           defined\MessageBreak SIunits mode may cause
+           errors}%
+       \fi
+     \fi}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\gray}
+% The potential clash with \pkg{PStricks} is also handled
+% differently; here, \cs{Gray} will already be defined by the
+%  \currpkg kernel.
+%    \begin{macrocode}
+\AtBeginDocument{
+  \@ifundefined{gray}
+    {\newunit{\gray}{Gy}}
+    {\ifsi@old@pstricks
+       \renewunit{\gray}{Gy}
+     \else
+       \ifsi@old@Gray\else
+         \si@log@warn{\string\gray\space already
+           defined\MessageBreak SIunits mode may cause
+           errors}%
+       \fi
+     \fi}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\unit}
+%\begin{macro}{\unita}
+% The \cs{unit} macro is defined.
+%    \begin{macrocode}
+\ifsi@old@italian
+  \let\unita\SI
+\else
+  \let\unit\SI
+\fi
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+% The miscellaneous options are moped up.
+%    \begin{macrocode}
+\ifsi@old@textstyle
+  \sisetup{mode=text}
+\fi
+\ifsi@old@binary
+  \sisetup{alsoload=binary}
+\fi
+\ifsi@old@noams
+  \AtBeginDocument{%
+    \renewcommand*{\si@textmu}{\ensuremath\si@mathsmu}}
+\fi
+%    \end{macrocode}
+%\begin{macro}{\arcminute}
+%\begin{macro}{\arcsecond}
+%\begin{macro}{\rperminute}
+%\begin{macro}{\ton}
+%\begin{macro}{\degreecelsius}
+% The unit macros defined by \SIunits that are not defined by
+% \currpkg (by default).
+%    \begin{macrocode}
+\newunit[valuesep=none]{\arcminute}{\si@sym@minute}
+\newunit[valuesep=none]{\arcsecond}{\si@sym@second}
+\newunit{\rperminute}{r/min}
+\newunit{\ton}{t}
+\newunit{\degreecelsius}{\celsius}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\addunit}
+% This is an alias for \cs{newunit}.
+%    \begin{macrocode}
+\let\addunit\newunit
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\addprefix}
+% A little more work for \cs{addprefix}.
+%    \begin{macrocode}
+\newcommand*{\addprefix}[2]{\newprefix{#1}{#2}}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\si@siu@newunit}
+%\begin{macro}{\si@siu@power}
+%\begin{macro}{\si@siu@newunithook}
+% To save some code, making new units which need a \texttt{\ldots np}
+% variant is handled by a dedicated macro.\\
+%\cs{si@siu@addunit}\oarg{power}\marg{pre}\marg{post}
+%    \begin{macrocode}
+\newcommand*{\si@siu@newunit}[3][]{%
+%    \end{macrocode}
+% A test is needed to sort out \cs{square}.
+%    \begin{macrocode}
+  \renewcommand*{\si@tempa}{#1}%
+  \renewcommand*{\si@tempb}{square}%
+  \renewcommand*{\si@siu@power}{}%
+  \ifx\@empty\si@tempa\@empty\else
+    \ifx\si@tempa\si@tempb
+      \renewcommand*{\si@siu@power}{\ssquare}%
+    \else
+      \edef\si@siu@power{%
+        \expandafter\noexpand\csname #1\endcsname}%
+    \fi
+  \fi
+%    \end{macrocode}
+% The necessary information is now stored in temporary macros.
+%    \begin{macrocode}
+  \edef\si@tempa{%
+    \expandafter\noexpand\csname #2per#1#3\endcsname}%
+  \edef\si@tempb{%
+    \expandafter\noexpand\csname #2\endcsname\noexpand\per
+    \expandafter\noexpand\si@siu@power
+    \expandafter\noexpand\csname #3\endcsname}%
+  \expandafter\expandafter\expandafter\newunit\expandafter%
+    \expandafter\expandafter{\expandafter\si@tempa\expandafter}%
+      \expandafter{\si@tempb}
+  \edef\si@tempa{%
+    \expandafter\noexpand\csname #2per#1#3np\endcsname}%
+  \edef\si@tempb{%
+    \expandafter\noexpand\csname #2\endcsname\noexpand
+    \reciprocal\expandafter\noexpand\si@siu@power
+    \expandafter\noexpand\csname #3\endcsname}%
+  \expandafter\expandafter\expandafter\newunit\expandafter
+    \expandafter\expandafter{\expandafter\si@tempa\expandafter}%
+      \expandafter{\si@tempb}%
+  \si@siu@newunithook[#1]{#2}{#3}}
+\providecommand*{\si@siu@newunithook}[3][]{}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+% The basic units are now defined; these only have a single csname in
+% each of the numerator and denominator.
+%    \begin{macrocode}
+\si@siu@newunit{gray}{second}
+\si@siu@newunit[square]{metre}{second}
+\si@siu@newunit{joule}{mole}
+\si@siu@newunit[cubic]{mole}{metre}
+\si@siu@newunit[square]{radian}{second}
+\si@siu@newunit{radian}{second}
+\si@siu@newunit[cubic]{squaremetre}{metre}
+\si@siu@newunit[cubic]{katal}{metre}
+\si@siu@newunit{coulomb}{mol}
+\si@siu@newunit[square]{ampere}{metre}
+\si@siu@newunit[cubic]{kilogram}{metre}
+\si@siu@newunit[cubic]{coulomb}{metre}
+\si@siu@newunit{volt}{metre}
+\si@siu@newunit[square]{coulomb}{squaremetre}
+\si@siu@newunit{farad}{metre}
+\si@siu@newunit[square]{watt}{metre}
+\si@siu@newunit[square]{joule}{metre}
+\si@siu@newunit[cubic]{newton}{metre}
+\si@siu@newunit{newton}{kilogram}
+\si@siu@newunit{joule}{kelvin}
+\si@siu@newunit{joule}{kilogram}
+\si@siu@newunit{coulomb}{kilogram}
+\si@siu@newunit{squaremetre}{second}
+\si@siu@newunit[square]{squaremetre}{second}
+\si@siu@newunit[square]{candela}{metre}
+\si@siu@newunit{ampere}{metre}
+\si@siu@newunit{joule}{tesla}
+\si@siu@newunit{henry}{metre}
+\si@siu@newunit{kilogram}{second}
+\si@siu@newunit[square]{kilogram}{metre}
+\si@siu@newunit{kilogram}{metre}
+\si@siu@newunit[square]{newton}{metre}
+\si@siu@newunit{watt}{kilogram}
+\si@siu@newunit[cubic]{watt}{metre}
+\si@siu@newunit{squaremetre}{kilogram}
+\si@siu@newunit{cubicmetre}{kilogram}
+\si@siu@newunit{newton}{metre}
+\si@siu@newunit[cubic]{squaremetre}{second}
+\si@siu@newunit{metre}{second}
+\si@siu@newunit[cubic]{joule}{metre}
+\si@siu@newunit{cubicmetre}{second}
+%    \end{macrocode}
+%\begin{macro}{\si@siu@newunitx}
+%\begin{macro}{\si@siu@newunitxhook}
+% For the more complex units, a slightly different approach is used;
+% four arguments are required, and have to cover everything.
+%    \begin{macrocode}
+\newcommand*{\si@siu@newunitx}[4]{%
+  \expandafter\newunit\expandafter{\csname #1per#2\endcsname}
+    {#3\per#4}%
+  \expandafter\newunit\expandafter{\csname #1per#2np\endcsname}
+    {#3\reciprocal#4}
+  \si@siu@newunitxhook{#1}{#2}{#3}{#4}}
+\providecommand*{\si@siu@newunitxhook}[4]{}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+% The units are defined.
+%    \begin{macrocode}
+\si@siu@newunitx{kilogramsquaremetre}{second}
+  {\kilogram\squaremetre}{\second}
+\si@siu@newunitx{squaremetre}{newtonsecond}{\squaremetre}
+  {\newton\second}
+\si@siu@newunitx{kilogrammetre}{second}{\kilogram\metre}
+  {\second}
+\si@siu@newunitx{kilogram}{squaremetresecond}{\kilogram}
+  {\squaremetre\second}
+\si@siu@newunitx{joule}{molekelvin}{\joule}{\mole\kelvin}
+\si@siu@newunitx{kilogram}{kilomole}{\kilogram}{\kilo\mole}
+\si@siu@newunitx{kilogrammetre}{squaresecond}{\kilogram\metre}
+  {\second\squared}
+\si@siu@newunitx{watt}{squaremetresteradian}{\watt}
+  {\squaremetre\steradian}
+\si@siu@newunitx{joule}{kilogramkelvin}{\joule}
+  {\kilogram\kelvin}
+\si@siu@newunitx{watt}{metrekelvin}{\watt}{\metre\kelvin}
+\si@siu@newunitx{kilogram}{cubicmetrecoulomb}{\kilogram}
+  {\cubic\metre\coulomb}
+\si@siu@newunitx{kilogram}{secondcubicmetre}{\kilogram}
+  {\second\cubicmetre}
+%    \end{macrocode}
+%\begin{macro}{\si@siu@unity}
+% A bit of cleverness to get the ``1'' correct; to avoid any clash, the unit
+% is given an internal name.
+%    \begin{macrocode}
+\newunit{\si@siu@unity}{1}
+\si@siu@newunitx{}{squaremetresecond}{\si@siu@unity}
+  {\squaremetre\second}
+%    \end{macrocode}
+%\end{macro}
+% A few compound units that are best defined directly.
+%    \begin{macrocode}
+\newunit{\pascalsecond}{\pascal\second}
+\newunit{\amperemetresecond}{\ampere\metre\second}
+\newunit{\ohmmetre}{\ohm\metre}
+\newunit{\newtonmetre}{\newton\metre}
+\let\newtonmetrenp\newtonmetre
+\newunit{\kilogramsquaremetre}{\kilogram\squaremetre}
+\let\kilogramsquaremetrenp\kilogramsquaremetre
+%    \end{macrocode}
+%\begin{macro}{\si@siu@newprefix}
+% To generate the prefixes correctly, a small saving in repetition.\\
+%\cs{si@siu@newprefix}\marg{prefix}
+%    \begin{macrocode}
+\newcommand*{\si@siu@newprefix}[1]{%
+  \edef\si@tempa{\expandafter\noexpand\csname #1d\endcsname}%
+  \edef\si@tempb{\expandafter\noexpand\csname #1\endcsname}%
+  \expandafter\expandafter\expandafter\newcommand\expandafter
+    \expandafter\expandafter*\expandafter\expandafter
+    \expandafter{\expandafter\si@tempa\expandafter}\expandafter
+      {\expandafter\si@prefixsymbolicfalse\si@tempb}}
+%    \end{macrocode}
+%\end{macro}
+% This is now implemented.
+%    \begin{macrocode}
+\si@siu@newprefix{yocto}
+\si@siu@newprefix{zepto}
+\si@siu@newprefix{atto}
+\si@siu@newprefix{femto}
+\si@siu@newprefix{pico}
+\si@siu@newprefix{nano}
+\si@siu@newprefix{micro}
+\si@siu@newprefix{milli}
+\si@siu@newprefix{centi}
+\si@siu@newprefix{deca}
+\si@siu@newprefix{deka}
+\si@siu@newprefix{hecto}
+\si@siu@newprefix{kilo}
+\si@siu@newprefix{mega}
+\si@siu@newprefix{giga}
+\si@siu@newprefix{tera}
+\si@siu@newprefix{peta}
+\si@siu@newprefix{exa}
+\si@siu@newprefix{zetta}
+\si@siu@newprefix{yotta}
+\ifsi@old@binary
+  \si@siu@newprefix{kibi}
+  \si@siu@newprefix{mebi}
+  \si@siu@newprefix{gibi}
+  \si@siu@newprefix{tebi}
+  \si@siu@newprefix{pebi}
+  \si@siu@newprefix{exbi}
+\fi
+%    \end{macrocode}
+%\begin{macro}{\derradian}
+%\begin{macro}{\dersteradian}
+%\begin{macro}{\derhertz}
+%\begin{macro}{\dernewton}
+%\begin{macro}{\derpascal}
+%\begin{macro}{\derjoule}
+%\begin{macro}{\derwatt}
+%\begin{macro}{\dercoulomb}
+%\begin{macro}{\dervolt}
+%\begin{macro}{\derfarad}
+%\begin{macro}{\derohm}
+% The derived units may need to be defined.
+%    \begin{macrocode}
+\ifsi@old@derived
+  \newunit{\derradian}{\metre\reciprocal\metre}
+  \newunit{\dersteradian}{\squaremetre\rpsquare\metre}
+  \newunit{\derhertz}{\reciprocal\second}
+  \newunit{\dernewton}{\metre\kilogram\second\rpsquared}
+  \newunit{\derpascal}{\newton\rpsquare\metre}
+  \newunit{\derjoule}{\newton\metre}
+  \newunit{\derwatt}{\joule\reciprocal\second}
+  \newunit{\dercoulomb}{\ampere\second}
+  \newunit{\dervolt}{\watt\reciprocal\ampere}
+  \newunit{\derfarad}{\coulomb\reciprocal\volt}
+  \newunit{\derohm}{\volt\reciprocal\ampere}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\dersiemens}
+%\begin{macro}{\derweber}
+%\begin{macro}{\dertesla}
+%\begin{macro}{\derhenry}
+%\begin{macro}{\dercelsius}
+%\begin{macro}{\derlumen}
+%\begin{macro}{\derlux}
+%\begin{macro}{\derbecquerel}
+%\begin{macro}{\dergray}
+%\begin{macro}{\dersievert}
+%\begin{macro}{\derkatal}
+% In two blocks!
+%    \begin{macrocode}
+  \newunit{\dersiemens}{\ampere\reciprocal\volt}
+  \newunit{\derweber}
+    {\squaremetre\kilogram\second\rpsquared\reciprocal\ampere}
+  \newunit{\dertesla}{\weber\rpsquare\metre}
+  \newunit{\derhenry}{\weber\reciprocal\ampere}
+  \newunit{\dercelsius}{\kelvin}
+  \newunit{\derlumen}{\candela\steradian}
+  \newunit{\derlux}{\lumen\rpsquare\metre}
+  \newunit{\derbecquerel}{\derhertz}
+  \newunit{\dergray}{\joule\reciprocal\kilogram}
+  \newunit{\dersievert}{\dergray}
+  \newunit{\derkatal}{\rp\second\usk\mole}
+\fi
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\radianbase}
+%\begin{macro}{\steradianbase}
+%\begin{macro}{\hertzbase}
+%\begin{macro}{\newtonbase}
+%\begin{macro}{\pascalbase}
+%\begin{macro}{\joulebase}
+%\begin{macro}{\wattbase}
+%\begin{macro}{\coulombbase}
+%\begin{macro}{\voltbase}
+%\begin{macro}{\faradbase}
+%\begin{macro}{\ohmbase}
+% Also the ``derived-in-base''.
+%    \begin{macrocode}
+\ifsi@old@derivedinbase
+  \newunit{\radianbase}{\metre\reciprocal\metre}
+  \newunit{\steradianbase}{\squaremetre\rpsquare\metre}
+  \newunit{\hertzbase}{\reciprocal\second}
+  \newunit{\newtonbase}{\metre\kilogram\second\rpsquared}
+  \newunit{\pascalbase}{\reciprocal\metre\kilogram\second%
+    \rpsquared}
+  \newunit{\joulebase}{\squaremetre\kilogram\second\rpsquared}
+  \newunit{\wattbase}{\squaremetre\kilogram\rpcubic\second}
+  \newunit{\coulombbase}{\ampere\second}
+  \newunit{\voltbase}
+    {\squaremetre\kilogram\rpcubic\second\reciprocal\ampere}
+  \newunit{\faradbase}
+    {\rpsquare\metre\reciprocal\kilogram\fourth\second\ampere%
+      \squared}
+  \newunit{\ohmbase}
+    {\squaremetre\kilogram\rpcubic\second\rpsquare\ampere}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\siemensbase}
+%\begin{macro}{\weberbase}
+%\begin{macro}{\teslabase}
+%\begin{macro}{\henrybase}
+%\begin{macro}{\celsiusbase}
+%\begin{macro}{\lumenbase}
+%\begin{macro}{\luxbase}
+%\begin{macro}{\becquerelbase}
+%\begin{macro}{\graybase}
+%\begin{macro}{\sievertbase}
+%\begin{macro}{\katalbase}
+% Also in two blocks.
+%    \begin{macrocode}
+  \newunit{\siemensbase}
+    {\rpsquare\metre\reciprocal\kilogram\cubic\second\ampere%
+       \squared}
+  \newunit{\weberbase}
+    {\squaremetre\kilogram\second\rpsquared\reciprocal\ampere}
+  \newunit{\teslabase}{\kilogram\second\rpsquared\reciprocal%
+     \ampere}
+  \newunit{\henrybase}
+    {\squaremetre\kilogram\second\rpsquared\rpsquare\ampere}
+  \newunit{\celsiusbase}{\kelvin}
+  \newunit{\lumenbase}{\candela\squaremetre\rpsquare\metre}
+  \newunit{\luxbase}{\candela\squaremetre\rpfourth\metre}
+  \newunit{\becquerelbase}{\hertzbase}
+  \newunit{\graybase}{\squaremetre\second\rpsquared}
+  \newunit{\sievertbase}{\graybase}
+  \newunit{\katalbase}{\rp\second\mole}
+\fi
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+% Any configuration file is used if found.
+%    \begin{macrocode}
+\InputIfFileExists{SIunits.cfg}
+  {\si@log@inf{SIunits config file loaded}}
+  {\si@log@inf{SIunits config file not found}}
+%    \end{macrocode}
+%\iffalse
+%</SIunits>
+%<*hepunits>
+%\fi
+%\subsection{\pkg{hepunits}}
+% The \pkg{hepunits} package provides some rather odd unit names,
+% which are not really to be encouraged.
+%    \begin{macrocode}
+\ProvidesFile{si-hepunits.cfg}
+  [\csname si@svn@version\endcsname Emulation of siunitx:
+     hepunits]
+\si@emulating{hepunits}{2007/09/27}
+\requiresiconfigs{SIunits,accepted,prefix,hep}
+%    \end{macrocode}
+%\begin{macro}{\invbarn}
+%\begin{macro}{\invnanobarn}
+%\begin{macro}{\invpicobarn}
+%\begin{macro}{\invfemtobarn}
+%\begin{macro}{\invattobarn}
+%\begin{macro}{\invzeptobarn}
+%\begin{macro}{\invyoctobarn}
+% Inverses barn units.
+%    \begin{macrocode}
+\ifsi@old@noprefixcmds\else
+  \newunit{\invbarn}{\per\barn}
+  \newunit{\invnanobarn}{\per\nano\barn}
+  \newunit{\invpicobarn}{\per\pico\barn}
+  \newunit{\invfemtobarn}{\per\femto\barn}
+  \newunit{\invattobarn}{\per\atto\barn}
+  \newunit{\invzeptobarn}{\per\zepto\barn}
+  \newunit{\invyoctobarn}{\per\yocto\barn}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\invnb}
+%\begin{macro}{\invpb}
+%\begin{macro}{\invfb}
+%\begin{macro}{\invab}
+%\begin{macro}{\invzb}
+%\begin{macro}{\invyb}
+% Also available abbreviated.
+%    \begin{macrocode}
+  \newunit{\invnb}{\per\nano\barn}
+  \newunit{\invpb}{\per\pico\barn}
+  \newunit{\invfb}{\per\femto\barn}
+  \newunit{\invab}{\per\atto\barn}
+  \newunit{\invzb}{\per\zepto\barn}
+  \newunit{\invyb}{\per\yocto\barn}
+\fi
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\invcmsqpersecond}
+%\begin{macro}{\invcmsqpersec}
+%\begin{macro}{\lumiunits}
+% Luminosity.
+%    \begin{macrocode}
+\newunit{\invcmsqpersecond}{\per\Square\centi\metre\per\second}
+\newunit{\invcmsqpersec}{\per\Square\centi\metre\per\second}
+\newunit{\lumiunits}{\per\Square\centi\metre\per\second}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\inveV}
+%\begin{macro}{\minveV}
+%\begin{macro}{\minveV}
+%\begin{macro}{\kinveV}
+%\begin{macro}{\MinveV}
+%\begin{macro}{\GinveV}
+%\begin{macro}{\TinveV}
+% The inverse of an electron-volt, plus prefixes.
+%    \begin{macrocode}
+\newunit{\inveV}{\per\electronvolt}
+\newunit{\minveV}{\per\milli\electronvolt}
+\newunit{\kinveV}{\per\kilo\electronvolt}
+\newunit{\MinveV}{\per\mega\electronvolt}
+\newunit{\GinveV}{\per\giga\electronvolt}
+\newunit{\TinveV}{\per\tera\electronvolt}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\eVoverc}
+%\begin{macro}{\eVovercsq}
+% Some combinations of electron-volts and the speed of light.  As
+% these are called |over|, they are set with a slash.  The
+% \opt{eVcorrb} values have been set for Computer Modern.
+%    \begin{macrocode}
+\newunit[per=slash,eVcorrb=0.6ex]{\eVoverc}
+  {\electronvolt\per\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\eVovercsq}
+  {\electronvolt\per\Square\clight}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\meVoverc}
+%\begin{macro}{\keVoverc}
+%\begin{macro}{\MeVoverc}
+%\begin{macro}{\GeVoverc}
+%\begin{macro}{\TeVoverc}
+% Prefixed combinations, first of the speed of light.
+%    \begin{macrocode}
+\newunit[per=slash,eVcorrb=0.6ex]{\meVoverc}
+  {\milli\electronvolt\per\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\keVoverc}
+  {\kilo\electronvolt\per\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\MeVoverc}
+  {\mega\electronvolt\per\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\GeVoverc}
+  {\giga\electronvolt\per\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\TeVoverc}
+  {\tera\electronvolt\per\clight}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\meVovercsq}
+%\begin{macro}{\keVovercsq}
+%\begin{macro}{\MeVovercsq}
+%\begin{macro}{\GeVovercsq}
+%\begin{macro}{\TeVovercsq}
+% Then of the square.
+%    \begin{macrocode}
+\newunit[per=slash,eVcorrb=0.6ex]{\meVovercsq}
+  {\milli\electronvolt\per\Square\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\keVovercsq}
+  {\kilo\electronvolt\per\Square\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\MeVovercsq}
+  {\mega\electronvolt\per\Square\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\GeVovercsq}
+  {\giga\electronvolt\per\Square\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\TeVovercsq}
+  {\tera\electronvolt\per\Square\clight}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\iffalse
+%</hepunits>
+%<*fancynum>
+%\fi
+%\subsection{\pkg{fancynum}}
+% \pkg{fancynum} only does things with numbers, so there is only
+% a little emulation and a few macros needed.
+%    \begin{macrocode}
+\ProvidesFile{si-fancynum.cfg}
+  [\csname si@svn@version\endcsname Emulation of siunitx:
+     fancynum]
+\si@emulating{fancynum}{2000/08/08 0.92}
+\sisetup{decimalsymbol=cdot,digitsep=comma}
+%    \end{macrocode}
+%\begin{macro}{\fnum}
+% The \cs{fnum} macro is rather restricted, but this is not
+% reproduced.  Instead, it is \cs{let} as an alias to the \cs{num}
+% macro.
+%    \begin{macrocode}
+\let\fnum\num
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\setfnumdsym}
+%\begin{macro}{\setfnumgsym}
+%\begin{macro}{\setfnummsym}
+% The control macros are defined.
+%    \begin{macrocode}
+\newcommand*{\setfnumdsym}[1]{\sisetup{decimalsymbol={#1}}}
+\newcommand*{\setfnumgsym}[1]{\sisetup{digitsep={#1}}}
+\newcommand*{\setfnummsym}[1]{\sisetup{expproduct={#1}}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+% The various package options are now processed if necessary.
+%    \begin{macrocode}
+\ifsi@old@english
+  \sisetup{decimalsymbol=cdot,digitsep=comma}
+\fi
+\ifsi@old@french
+  \sisetup{decimalsymbol=comma,digitsep=fullstop}
+\fi
+\ifsi@old@tight
+  \sisetup{expproduct=tighttimes}
+\fi
+\ifsi@old@loose
+  \sisetup{expproduct=times}
+\fi
+\ifsi@old@thinspaces
+  \sisetup{digitsep=thin}
+\fi
+\ifsi@old@commas
+  \sisetup{digitsep=comma}
+\fi
+\ifsi@old@plain
+  \sisetup{digitsep=none}
+\fi
+%    \end{macrocode}
+%
+%\iffalse
+%</fancynum>
+%<*fancyunits>
+%\fi
+%\subsection{\pkg{fancyunits}}
+% The \pkg{fancyunits} package is not available on \textsc{ctan}, but
+% is available from its authors homepage \cite{fancyunits}.  It is
+% similar to \SIunits, and so most of the code is shared here.
+% However, a few bits of set up occur first, and an emulation-clash
+% test is needed.
+%    \begin{macrocode}
+\ProvidesFile{si-fancyunits.cfg}
+  [\csname si@svn@version\endcsname Emulation of siunitx:
+     fancyunits]
+\si@emulating{fancyunits}{2007/02/01 v1.0.1}
+\si@ifloaded{SIunits}
+  {\si@log@err{SIunits emulation loaded\MessageBreak before
+    fancyunits emulation}{You need to load the fancyunits
+    emualtion\MessageBreak code before that for
+    SIunits.\MessageBreak Try emulate=fancyunits as the first
+    option when\MessageBreak loading siunitx}}{}
+%    \end{macrocode}
+%\begin{macro}{\si@siu@newunithook}
+%\begin{macro}{\si@siu@newunitxhook}
+% To create the extra macros provided by \pkg{fancyunits}, the
+% \SIunits emulation code is changed to add the ``\texttt{uf}''
+% variants.
+%    \begin{macrocode}
+\newcommand*{\si@siu@newunithook}[3][]{%
+  \edef\si@tempa{%
+    \expandafter\noexpand\csname #2per#1#3uf\endcsname}%
+  \renewcommand*{\si@tempb}{stickyper,per=fraction,
+    fraction=nice}%
+  \edef\si@tempc{%
+    \noexpand\sisetup{\si@tempb}%
+    \expandafter\noexpand\csname #2\endcsname\noexpand\si@per%
+    \expandafter\noexpand\si@siu@power%
+    \expandafter\noexpand\csname #3\endcsname}%
+  \expandafter\expandafter\expandafter\newunit\expandafter
+    \expandafter\expandafter{\expandafter\si@tempa\expandafter}%
+      \expandafter{\si@tempc}%
+  \edef\si@tempa{%
+    \expandafter\noexpand\csname #2per#1#3Uf\endcsname}%
+  \renewcommand*{\si@tempb}{stickyper,per=fraction,
+    fraction=frac}%
+  \edef\si@tempc{%
+    \noexpand\sisetup{\si@tempb}%
+    \noexpand\def\noexpand\si@frc@hook{\noexpand\textstyle}%
+    \expandafter\noexpand\csname #2\endcsname\noexpand\si@per%
+    \expandafter\noexpand\si@siu@power%
+    \expandafter\noexpand\csname #3\endcsname}%
+  \expandafter\expandafter\expandafter\newunit\expandafter
+    \expandafter\expandafter{\expandafter\si@tempa\expandafter}%
+      \expandafter{\si@tempc}%
+  \edef\si@tempa{%
+    \expandafter\noexpand\csname #2per#1#3UF\endcsname}%
+  \edef\si@tempc{%
+    \noexpand\sisetup{\si@tempb}%
+    \noexpand\def\noexpand\si@frc@hook{\noexpand\displaystyle}%
+    \expandafter\noexpand\csname #2\endcsname\noexpand\si@per%
+    \expandafter\noexpand\si@siu@power%
+    \expandafter\noexpand\csname #3\endcsname}%
+  \expandafter\expandafter\expandafter\newunit\expandafter
+    \expandafter\expandafter{\expandafter\si@tempa\expandafter}%
+      \expandafter{\si@tempc}}
+\newcommand*{\si@siu@newunitxhook}[4]{%
+  \expandafter\newunit\expandafter{\csname #1per#2uf\endcsname}
+    {\sisetup{stickyper,per=fraction,fraction=nice}%
+     #3\si@per#4}%
+  \expandafter\newunit\expandafter{\csname #1per#2Uf\endcsname}
+    {\sisetup{stickyper,per=fraction,fraction=frac}%
+     \renewcommand*{\si@frc@hook}{\textstyle}%
+     #3\si@per#4}%
+  \expandafter\newunit\expandafter{\csname #1per#2UF\endcsname}
+    {\sisetup{stickyper,per=fraction,fraction=frac}%
+     \renewcommand*{\si@frc@hook}{\displaystyle}%
+     #3\si@per#4}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+% With that done, the emulation modules can be loaded.
+%    \begin{macrocode}
+\requiresiconfigs{SIunits,addn,astro}
+\sisetup{obeyall}
+%    \end{macrocode}
+% There is one \pkg{fancyunits}-specific option to handle.  The other
+% options all get sent through to the \SIunits system.\footnote{As
+% \SIunits is rather more widely known than \pkg{fancyunits}, any
+% other options which could be for either are assumed to be for
+% \SIunits.}
+%    \begin{macrocode}
+\ifsi@old@spaceqspace
+  \sisetup{valuesep=space}
+\fi
+%    \end{macrocode}
+%\begin{macro}{\paminute}
+%\begin{macro}{\parsecond}
+%\begin{macro}{\AstroE}
+%\begin{macro}{\oersted}
+%\begin{macro}{\ton}
+% \pkg{fancyunits} provides some extra units, plus tonne spelled
+% incorrectly (again).
+%    \begin{macrocode}
+\newunit{\paminute}{'}
+\newunit{\parsecond}{''}
+\newunit{\AstroE}{AE}
+\newunit{\oersted}{OE}
+\provideunit{\ton}{t}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\decaD}
+% An additional prefix.
+%    \begin{macrocode}
+\let\decaD\decad
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\ufrac}
+%\begin{macro}{\Ufrac}
+%\begin{macro}{\UFrac}
+% The fractional unit macros need to be reproduced.
+%    \begin{macrocode}
+\newcommand*{\ufrac}[2]{%
+  \si[stickyper,per=fraction,fraction=nice]{#1\si@per#2}}
+\newcommand*{\Ufrac}[2]{%
+  \ensuremath{\textstyle{%
+    \si[stickyper,per=fraction,fraction=frac]{#1\si@per#2}}}}
+\newcommand*{\UFrac}[2]{%
+  \ensuremath{\displaystyle{%
+    \si[stickyper,per=fraction,fraction=frac]{#1\si@per#2}}}}
+%    \end{macrocode}
+%\end{macro}
+%\end{macro}
+%\end{macro}
+%\begin{macro}{\pow}
+% A slightly-shorted named \cs{power}.
+%    \begin{macrocode}
+\let\pow\power
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\Squaremetre}
+% An alias for \cs{squaremetre}.
+%    \begin{macrocode}
+\let\Squaremetre\squaremetre
+%    \end{macrocode}
+%\end{macro}
+% As with \SIunits, there is now a list of compound units to add.
+% Only a few are not covered by the \SIunits emulation.
+%    \begin{macrocode}
+\si@siu@newunit{Gray}{second}
+\si@siu@newunit[square]{Squaremetre}{metre}
+\si@siu@newunitx{Squaremetre}{newtonsecond}{\Square\metre}
+  {\newton\second}
+\si@siu@newunit{Squaremetre}{second}
+\si@siu@newunit[square]{Squaremetre}{squaresecond}
+\si@siu@newunit{Squaremetre}{kilogram}
+\si@siu@newunit[cubic]{Squaremetre}{second}
+%    \end{macrocode}
+%\iffalse
+%</fancyunits>
+%\fi
+%
+%\Finale
+%\iffalse
+%<*refs>
+@misc{BIPM:EN,
+  note = {\url{http://www.bipm.org/en/si/}},
+}
+
+@misc{BIPM:FR,
+  note = {\url{http://www.bipm.org/fr/si/}},
+}
+
+@misc{BIPM:PDF,
+  note = {\url{http://www.bipm.org/en/si/si_brochure/}},
+}
+
+@misc{Eijkhout,
+  author =       {Victor Eijkhout},
+  note =         {\url{http://www.eijkhout.net/tbt/}},
+  title =        {{\TeX} by {T}opic},
+  year =         {2007},
+}
+
+@misc{fancyunits,
+  author = {Heiko Bauke},
+  note = {\url{http://www.mpi-hd.mpg.de/personalhomes/bauke/LaTeX/Tips_und_Tricks/fancyunits/index.php}},
+  title = {\pkg{fancyunits}},
+  year = 2007,
+}
+
+@misc{IUPAC,
+  note = {\url{http://old.iupac.org/publications/books/gbook/green_book_2ed.pdf}},
+  title = {The \textsc{iupac} {G}reen {B}ook},
+  year = 1993,
+}
+
+@misc{NIST,
+  note = {\url{http://physics.nist.gov/cuu/Units/index.html}},
+}
+%</refs>
+%<*jawltxdoc>
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{jawltxdoc}
+\usepackage[T1]{fontenc}
+\usepackage{lmodern}
+\usepackage[final]{listings,graphicx,microtype}
+\usepackage[scaled=0.95]{helvet}
+\usepackage[version=3]{mhchem}
+\usepackage[osf]{mathpazo}
+\usepackage{booktabs,array,url,courier,xspace,etoolbox,varioref}
+\usepackage{upgreek,ifpdf,float,caption,longtable,babel}
+\floatstyle{plaintop}
+\restylefloat{table}
+\labelformat{figure}{\figurename~#1}
+\labelformat{table}{\tablename~#1}
+\ifpdf
+  \usepackage{embedfile}
+  \embedfile[%
+    stringmethod=escape,%
+    mimetype=plain/text,%
+    desc={LaTeX docstrip source archive for package `\jobname'}%
+    ]{\jobname.dtx}
+\fi
+\IfFileExists{\jobname.sty}
+  {\usepackage{\jobname}}{}
+\usepackage[numbered]{hypdoc}
+\setcounter{IndexColumns}{2}
+\newlength\LaTeXwidth
+\newlength\LaTeXoutdent
+\newlength\LaTeXgap
+\setlength\LaTeXgap{1em}
+\setlength\LaTeXoutdent{-0.15\textwidth}
+\newbox\lst@samplebox
+\edef\LaTeXexamplefile{\jobname.tmp}
+\lst@RequireAspects{writefile}
+\lstnewenvironment{LaTeXexample}[1][example]{%
+  \global\let\lst@intname\@empty
+  \ifcsname LaTeXcode#1\endcsname
+    \expandafter\let\expandafter\LaTeXcode
+      \csname LaTeXcode#1\endcsname
+    \expandafter\let\expandafter\LaTeXcodeend
+      \csname LaTeXcode#1end\endcsname
+  \else
+    \PackageError{jawltxdoc}
+      {Undefined example type `#1'}
+      \@ehd
+    \let\LaTeXcode\relax
+    \let\LaTeXcodeend\relax
+  \fi
+  \LaTeXcode}
+  {\lst@EndWriteFile
+   \LaTeXcodeend}
+\newcommand*{\LaTeXcodeexample}{%
+  \setbox\lst@samplebox=\hbox\bgroup
+  \LaTeXcodefloat}
+\newcommand*{\LaTeXcodeexampleend}{%
+  \egroup
+  \setlength\LaTeXwidth{\wd\lst@samplebox}%
+  \begin{list}{}{%
+    \setlength\itemindent{0pt}
+    \setlength\leftmargin\LaTeXoutdent
+    \setlength\rightmargin{0pt}}%
+    \item
+      \setlength\LaTeXoutdent{-0.15\textwidth}
+      \begin{minipage}[c]{%
+        \textwidth-\LaTeXwidth-\LaTeXoutdent-\LaTeXgap}
+        \LaTeXcodefloatend
+      \end{minipage}%
+      \hfill
+      \begin{minipage}[c]{\LaTeXwidth}%
+        \hbox to\linewidth{\box\lst@samplebox\hss}%
+      \end{minipage}%
+  \end{list}}
+\let\LaTeXcodenoexample\LaTeXcodeexample
+\newcommand*{\LaTeXcodenoexampleend}{%
+  \egroup
+  \setlength\LaTeXwidth{\wd\lst@samplebox}%
+  \begin{list}{}{%
+    \setlength\itemindent{0pt}
+    \setlength\leftmargin{0pt}
+    \setlength\rightmargin{0pt}}%
+    \item
+      \begin{minipage}[c]{\LaTeXwidth}
+        \hbox to\linewidth{\box\lst@samplebox\hss}%
+      \end{minipage}%
+  \end{list}}
+\newcommand*{\LaTeXcodefloat}{%
+  \setkeys{lst}{tabsize=4,gobble=3,breakindent=0pt,
+    basicstyle=\small\ttfamily,basewidth=0.51em,
+    keywordstyle=\color{blue}}%
+  \lst@BeginAlsoWriteFile{\LaTeXexamplefile}}
+\newcommand*{\LaTeXcodefloatend}{%
+  \MakePercentComment\catcode`\^^M=10\relax
+  \small
+  {\setkeys{lst}{SelectCharTable=\lst@ReplaceInput{\^\^I}%
+    {\lst@ProcessTabulator}}%
+    \leavevmode \input{\LaTeXexamplefile}}%
+  \MakePercentIgnore}
+\lstnewenvironment{BibTeXexample}{%
+  \global\let\lst@intname\@empty
+  \setbox\lst@samplebox=\hbox\bgroup
+  \setkeys{lst}{tabsize=4,gobble=3,breakindent=0pt,
+    basicstyle=\small\ttfamily,basewidth=0.51em,
+    keywordstyle=\color{black}}
+  \lst@BeginAlsoWriteFile{\LaTeXexamplefile}}
+ {\lst@EndWriteFile
+   \LaTeXcodeexampleend}
+\newcommand*{\DescribeOption}{%
+  \leavevmode\@bsphack\begingroup\MakePrivateLetters
+  \Describe@Option}
+\newcommand*{\Describe@Option}[1]{\endgroup
+              \marginpar{\raggedleft\PrintDescribeEnv{#1}}%
+              \SpecialOptionIndex{#1}\@esphack\ignorespaces}
+\newcommand*{\SpecialOptionIndex}[1]{\@bsphack
+    \index{#1\actualchar{\protect\ttfamily#1}
+           (option)\encapchar usage}%
+    \index{options:\levelchar#1\actualchar{\protect\ttfamily#1}%
+      \encapchar usage}\@esphack}
+\newcommand*{\indexopt}[1]{\DescribeOption{#1}\opt{#1}}
+\newcommand*{\DescribeOptionInfo}[2]{%
+  \DescribeOption{#1}%
+  \opt{#1=\meta{#2}}\xspace}
+\newcommand*{\ofixarg}[1]{%
+  {\ttfamily[}%
+  \ifmmode \expandafter \nfss@text \fi
+  {%
+    \meta@font@select
+    \edef\meta@hyphen@restore{%
+      \hyphenchar\the\font\the\hyphenchar\font}%
+    \hyphenchar\font\m@ne
+    \language\l@nohyphenation
+    #1\/%
+    \meta@hyphen@restore
+    }%
+    {\ttfamily]}}
+\newcommand*{\pkg}[1]{\textsf{#1}}
+\newcommand*{\currpkg}{\pkg{\jobname}\xspace}
+\newcommand*{\opt}[1]{\texttt{#1}}
+\newcommand*{\defaultopt}[1]{\opt{\textbf{#1}}}
+\newcommand*{\file}[1]{\texttt{#1}}
+\newcommand*{\ext}[1]{\file{.#1}}
+\newcommand*{\latin}[1]{\emph{#1}}
+\newcommand*{\etc}{%
+  \@ifnextchar.
+    {\latin{etc}}
+    {\latin{etc}.\xspace}}
+\newcommand*{\eg}{%
+  \@ifnextchar.
+    {\latin{e.g}}
+    {\latin{e.g}.\xspace}}
+\newcommand*{\ie}{%
+  \@ifnextchar.
+    {\latin{i.e}}
+    {\latin{i.e}.\xspace}}
+\newcommand*{\AMS}{{\protect\usefont{OMS}{cmsy}{m}{n}%
+  A\kern-.1667em\lower.5ex\hbox{M}\kern-.125emS}}
+\providecommand*{\eTeX}{\ensuremath{\varepsilon}-\TeX}
+\DeclareRobustCommand*{\XeTeX}
+  {X\kern-.125em\lower.5ex\hbox{\reflectbox{E}}\kern-.1667em\TeX}
+\providecommand*{\CTAN}{\textsc{ctan}}
+\patchcmd{\@addmarginpar}
+  {\@latex@warning@no@line {Marginpar on page \thepage\space moved}}
+  {\relax}{}{}
+%</jawltxdoc>
+%\fi
diff --git a/Master/texmf-dist/source/latex/siunitx/siunitx.ins b/Master/texmf-dist/source/latex/siunitx/siunitx.ins
new file mode 100644
index 00000000000..60b954530c6
--- /dev/null
+++ b/Master/texmf-dist/source/latex/siunitx/siunitx.ins
@@ -0,0 +1,79 @@
+%%

+%% This is file `siunitx.ins',

+%% generated with the docstrip utility.

+%%

+%% The original source files were:

+%%

+%% siunitx.dtx  (with options: `install')

+%%  ----------------------------------------------------------------

+%%  The siunitx package --- A comprehensive (SI) units package

+%%  Maintained by Joseph Wright

+%%  E-mail: joseph.wright@morningstar2.co.uk

+%%  Released under the LaTeX Project Public License v1.3c or later

+%%  See http://www.latex-project.org/lppl.txt

+%%  ----------------------------------------------------------------

+%% 

+\input docstrip.tex

+\keepsilent

+\askforoverwritefalse

+\preamble

+ ----------------------------------------------------------------

+ The siunitx package --- A comprehensive (SI) units package

+ Maintained by Joseph Wright

+ E-mail: joseph.wright@morningstar2.co.uk

+ Released under the LaTeX Project Public License v1.3c or later

+ See http://www.latex-project.org/lppl.txt

+ ----------------------------------------------------------------

+

+\endpreamble

+\Msg{Generating siunitx files:}

+\generate{\file{jawltxdoc.sty}{\from{\jobname.dtx}{jawltxdoc}}

+}

+\usedir{tex/latex/siunitx}

+\generate{\file{\jobname.sty}{\from{\jobname.dtx}{package}}

+}

+\usedir{source/latex/siunitx}

+\generate{\file{\jobname.ins}{\from{\jobname.dtx}{install}}

+}

+\usedir{doc/latex/siunitx}

+\generate{\file{si-bug.ltx}{\from{\jobname.dtx}{bug}}

+}

+\usedir{tex/latex/siunitx/config}

+\generate{\file{si-SIunits.cfg}{\from{\jobname.dtx}{SIunits}}

+          \file{si-sistyle.cfg}{\from{\jobname.dtx}{sistyle}}

+          \file{si-unitsdef.cfg}{\from{\jobname.dtx}{unitsdef}}

+          \file{si-units.cfg}{\from{\jobname.dtx}{units}}

+          \file{si-hepunits.cfg}{\from{\jobname.dtx}{hepunits}}

+          \file{si-fancynum.cfg}{\from{\jobname.dtx}{fancynum}}

+          \file{si-fancyunits.cfg}{\from{\jobname.dtx}{fancyunits}}

+}

+\generate{\file{si-prefix.cfg}{\from{\jobname.dtx}{prefix}}

+          \file{si-named.cfg}{\from{\jobname.dtx}{named}}

+          \file{si-prefixed.cfg}{\from{\jobname.dtx}{prefixed}}

+          \file{si-addn.cfg}{\from{\jobname.dtx}{addn}}

+          \file{si-accepted.cfg}{\from{\jobname.dtx}{accepted}}

+          \file{si-physical.cfg}{\from{\jobname.dtx}{physical}}

+          \file{si-abbr.cfg}{\from{\jobname.dtx}{abbr}}

+}

+\generate{\file{si-synchem.cfg}{\from{\jobname.dtx}{synchem}}

+          \file{si-hep.cfg}{\from{\jobname.dtx}{hep}}

+          \file{si-astro.cfg}{\from{\jobname.dtx}{astro}}

+          \file{si-binary.cfg}{\from{\jobname.dtx}{binary}}

+}

+\generate{\file{si-UK.cfg}{\from{\jobname.dtx}{UK}}

+          \file{si-USA.cfg}{\from{\jobname.dtx}{USA}}

+          \file{si-DE.cfg}{\from{\jobname.dtx}{DE}}

+          \file{si-ZA.cfg}{\from{\jobname.dtx}{ZA}}

+}

+\nopreamble

+\usedir{bibtex/bib/siunitx}

+\generate{\file{\jobname.bib}{\from{\jobname.dtx}{refs}}

+}

+\nopreamble\nopostamble

+\usedir{doc/latex/siunitx}

+\generate{\file{README.txt}{\from{\jobname.dtx}{readme}}

+}

+\endbatchfile

+\endinput

+%%

+%% End of file `siunitx.ins'.

diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-DE.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-DE.cfg
new file mode 100644
index 00000000000..2f7b9d01d04
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-DE.cfg
@@ -0,0 +1,27 @@
+%%
+%% This is file `si-DE.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `DE')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-DE.cfg}
+  [\csname si@svn@version\endcsname siunitx: Germany locale]
+\sisetup{
+  unitsep=cdot,
+  valuesep=thin,
+  decimalsymbol=comma,
+  expproduct=cdot,
+  digitsep=thin,
+  sepfour=false}
+\endinput
+%%
+%% End of file `si-DE.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-SIunits.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-SIunits.cfg
new file mode 100644
index 00000000000..d6237983a9c
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-SIunits.cfg
@@ -0,0 +1,329 @@
+%%
+%% This is file `si-SIunits.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `SIunits')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-SIunits.cfg}
+  [\csname si@svn@version\endcsname siunitx: Emulation of
+     SIunits]
+\si@emulating{SIunits}{2007/12/02 v1.36}
+\sisetup{
+  unitsep=thick,
+  valuesep=thick,
+  prefixproduct=\si@valuesep,
+  trapambigfrac=false,
+  stickyper}
+\requiresiconfigs{prefix,named,accepted,physical}
+\newcommand*{\reciprocal}{\sisetup{per=reciprocal}\si@per}
+\let\rp\reciprocal
+\renewcommand*{\per}{\sisetup{per=slash}\si@per}
+\newcommand*{\usk}{}
+\newcommand*{\power}[1]{#1\tothe}
+\newcommand*{\rpsquare}{\sisetup{per=reciprocal}\si@per\Square}
+\newcommand*{\rpcubic}{\sisetup{per=reciprocal}\si@per\cubic}
+\newpower{\fourth}{4}
+\newcommand*{\rpfourth}{\sisetup{per=reciprocal}\si@per\fourth}
+\newcommand*{\rpsquared}{%
+  \sisetup{per=reciprocal}\si@unt@pertrue\si@unt@perseentrue%
+    \squared}
+\newcommand*{\rpcubed}{%
+  \sisetup{per=reciprocal}\si@unt@pertrue\cubed}
+\newcommand*{\SIsetup}[1]{%
+  \@for\si@tempa:=#1\do{%
+    \@ifundefined{ifsi@old@#1}
+      {\si@log@warn{Unknown SIunits option `#1'}}
+      {\csname si@old@#1true\endcsname}}
+  \si@siu@setup}
+\newcommand*{\si@siu@setup}{%
+  \ifsi@old@cdot
+    \sisetup{unitsep=cdot}%
+  \fi
+  \ifsi@old@thickspace
+    \sisetup{unitsep=thick}%
+  \fi
+  \ifsi@old@mediumspace
+    \sisetup{unitsep=medium}%
+  \fi
+  \ifsi@old@thinspace
+    \sisetup{unitsep=thin}%
+  \fi
+  \ifsi@old@thickqspace
+    \sisetup{valuesep=thick}%
+  \fi
+  \ifsi@old@mediumqspace
+    \sisetup{valuesep=medium}%
+  \fi
+  \ifsi@old@thinqspace
+    \sisetup{valuesep=thin}%
+  \fi}
+\si@siu@setup
+\ifsi@old@squaren
+  \newpower{\squaren}{2}
+\fi
+\AtBeginDocument{%
+  \@ifundefined{square}
+    {\newpower{\square}{2}}
+    {\ifsi@old@amssymb
+       \renewpower{\square}{2}
+     \else
+       \ifsi@old@squaren\else
+         \si@log@warn{\string\square\space already
+           defined\MessageBreak SIunits mode may cause
+           errors}%
+       \fi
+     \fi}}
+\AtBeginDocument{
+  \@ifundefined{gray}
+    {\newunit{\gray}{Gy}}
+    {\ifsi@old@pstricks
+       \renewunit{\gray}{Gy}
+     \else
+       \ifsi@old@Gray\else
+         \si@log@warn{\string\gray\space already
+           defined\MessageBreak SIunits mode may cause
+           errors}%
+       \fi
+     \fi}}
+\ifsi@old@italian
+  \let\unita\SI
+\else
+  \let\unit\SI
+\fi
+\ifsi@old@textstyle
+  \sisetup{mode=text}
+\fi
+\ifsi@old@binary
+  \sisetup{alsoload=binary}
+\fi
+\ifsi@old@noams
+  \AtBeginDocument{%
+    \renewcommand*{\si@textmu}{\ensuremath\si@mathsmu}}
+\fi
+\newunit[valuesep=none]{\arcminute}{\si@sym@minute}
+\newunit[valuesep=none]{\arcsecond}{\si@sym@second}
+\newunit{\rperminute}{r/min}
+\newunit{\ton}{t}
+\newunit{\degreecelsius}{\celsius}
+\let\addunit\newunit
+\newcommand*{\addprefix}[2]{\newprefix{#1}{#2}}
+\newcommand*{\si@siu@newunit}[3][]{%
+  \renewcommand*{\si@tempa}{#1}%
+  \renewcommand*{\si@tempb}{square}%
+  \renewcommand*{\si@siu@power}{}%
+  \ifx\@empty\si@tempa\@empty\else
+    \ifx\si@tempa\si@tempb
+      \renewcommand*{\si@siu@power}{\ssquare}%
+    \else
+      \edef\si@siu@power{%
+        \expandafter\noexpand\csname #1\endcsname}%
+    \fi
+  \fi
+  \edef\si@tempa{%
+    \expandafter\noexpand\csname #2per#1#3\endcsname}%
+  \edef\si@tempb{%
+    \expandafter\noexpand\csname #2\endcsname\noexpand\per
+    \expandafter\noexpand\si@siu@power
+    \expandafter\noexpand\csname #3\endcsname}%
+  \expandafter\expandafter\expandafter\newunit\expandafter%
+    \expandafter\expandafter{\expandafter\si@tempa\expandafter}%
+      \expandafter{\si@tempb}
+  \edef\si@tempa{%
+    \expandafter\noexpand\csname #2per#1#3np\endcsname}%
+  \edef\si@tempb{%
+    \expandafter\noexpand\csname #2\endcsname\noexpand
+    \reciprocal\expandafter\noexpand\si@siu@power
+    \expandafter\noexpand\csname #3\endcsname}%
+  \expandafter\expandafter\expandafter\newunit\expandafter
+    \expandafter\expandafter{\expandafter\si@tempa\expandafter}%
+      \expandafter{\si@tempb}%
+  \si@siu@newunithook[#1]{#2}{#3}}
+\providecommand*{\si@siu@newunithook}[3][]{}
+\si@siu@newunit{gray}{second}
+\si@siu@newunit[square]{metre}{second}
+\si@siu@newunit{joule}{mole}
+\si@siu@newunit[cubic]{mole}{metre}
+\si@siu@newunit[square]{radian}{second}
+\si@siu@newunit{radian}{second}
+\si@siu@newunit[cubic]{squaremetre}{metre}
+\si@siu@newunit[cubic]{katal}{metre}
+\si@siu@newunit{coulomb}{mol}
+\si@siu@newunit[square]{ampere}{metre}
+\si@siu@newunit[cubic]{kilogram}{metre}
+\si@siu@newunit[cubic]{coulomb}{metre}
+\si@siu@newunit{volt}{metre}
+\si@siu@newunit[square]{coulomb}{squaremetre}
+\si@siu@newunit{farad}{metre}
+\si@siu@newunit[square]{watt}{metre}
+\si@siu@newunit[square]{joule}{metre}
+\si@siu@newunit[cubic]{newton}{metre}
+\si@siu@newunit{newton}{kilogram}
+\si@siu@newunit{joule}{kelvin}
+\si@siu@newunit{joule}{kilogram}
+\si@siu@newunit{coulomb}{kilogram}
+\si@siu@newunit{squaremetre}{second}
+\si@siu@newunit[square]{squaremetre}{second}
+\si@siu@newunit[square]{candela}{metre}
+\si@siu@newunit{ampere}{metre}
+\si@siu@newunit{joule}{tesla}
+\si@siu@newunit{henry}{metre}
+\si@siu@newunit{kilogram}{second}
+\si@siu@newunit[square]{kilogram}{metre}
+\si@siu@newunit{kilogram}{metre}
+\si@siu@newunit[square]{newton}{metre}
+\si@siu@newunit{watt}{kilogram}
+\si@siu@newunit[cubic]{watt}{metre}
+\si@siu@newunit{squaremetre}{kilogram}
+\si@siu@newunit{cubicmetre}{kilogram}
+\si@siu@newunit{newton}{metre}
+\si@siu@newunit[cubic]{squaremetre}{second}
+\si@siu@newunit{metre}{second}
+\si@siu@newunit[cubic]{joule}{metre}
+\si@siu@newunit{cubicmetre}{second}
+\newcommand*{\si@siu@newunitx}[4]{%
+  \expandafter\newunit\expandafter{\csname #1per#2\endcsname}
+    {#3\per#4}%
+  \expandafter\newunit\expandafter{\csname #1per#2np\endcsname}
+    {#3\reciprocal#4}
+  \si@siu@newunitxhook{#1}{#2}{#3}{#4}}
+\providecommand*{\si@siu@newunitxhook}[4]{}
+\si@siu@newunitx{kilogramsquaremetre}{second}
+  {\kilogram\squaremetre}{\second}
+\si@siu@newunitx{squaremetre}{newtonsecond}{\squaremetre}
+  {\newton\second}
+\si@siu@newunitx{kilogrammetre}{second}{\kilogram\metre}
+  {\second}
+\si@siu@newunitx{kilogram}{squaremetresecond}{\kilogram}
+  {\squaremetre\second}
+\si@siu@newunitx{joule}{molekelvin}{\joule}{\mole\kelvin}
+\si@siu@newunitx{kilogram}{kilomole}{\kilogram}{\kilo\mole}
+\si@siu@newunitx{kilogrammetre}{squaresecond}{\kilogram\metre}
+  {\second\squared}
+\si@siu@newunitx{watt}{squaremetresteradian}{\watt}
+  {\squaremetre\steradian}
+\si@siu@newunitx{joule}{kilogramkelvin}{\joule}
+  {\kilogram\kelvin}
+\si@siu@newunitx{watt}{metrekelvin}{\watt}{\metre\kelvin}
+\si@siu@newunitx{kilogram}{cubicmetrecoulomb}{\kilogram}
+  {\cubic\metre\coulomb}
+\si@siu@newunitx{kilogram}{secondcubicmetre}{\kilogram}
+  {\second\cubicmetre}
+\newunit{\si@siu@unity}{1}
+\si@siu@newunitx{}{squaremetresecond}{\si@siu@unity}
+  {\squaremetre\second}
+\newunit{\pascalsecond}{\pascal\second}
+\newunit{\amperemetresecond}{\ampere\metre\second}
+\newunit{\ohmmetre}{\ohm\metre}
+\newunit{\newtonmetre}{\newton\metre}
+\let\newtonmetrenp\newtonmetre
+\newunit{\kilogramsquaremetre}{\kilogram\squaremetre}
+\let\kilogramsquaremetrenp\kilogramsquaremetre
+\newcommand*{\si@siu@newprefix}[1]{%
+  \edef\si@tempa{\expandafter\noexpand\csname #1d\endcsname}%
+  \edef\si@tempb{\expandafter\noexpand\csname #1\endcsname}%
+  \expandafter\expandafter\expandafter\newcommand\expandafter
+    \expandafter\expandafter*\expandafter\expandafter
+    \expandafter{\expandafter\si@tempa\expandafter}\expandafter
+      {\expandafter\si@prefixsymbolicfalse\si@tempb}}
+\si@siu@newprefix{yocto}
+\si@siu@newprefix{zepto}
+\si@siu@newprefix{atto}
+\si@siu@newprefix{femto}
+\si@siu@newprefix{pico}
+\si@siu@newprefix{nano}
+\si@siu@newprefix{micro}
+\si@siu@newprefix{milli}
+\si@siu@newprefix{centi}
+\si@siu@newprefix{deca}
+\si@siu@newprefix{deka}
+\si@siu@newprefix{hecto}
+\si@siu@newprefix{kilo}
+\si@siu@newprefix{mega}
+\si@siu@newprefix{giga}
+\si@siu@newprefix{tera}
+\si@siu@newprefix{peta}
+\si@siu@newprefix{exa}
+\si@siu@newprefix{zetta}
+\si@siu@newprefix{yotta}
+\ifsi@old@binary
+  \si@siu@newprefix{kibi}
+  \si@siu@newprefix{mebi}
+  \si@siu@newprefix{gibi}
+  \si@siu@newprefix{tebi}
+  \si@siu@newprefix{pebi}
+  \si@siu@newprefix{exbi}
+\fi
+\ifsi@old@derived
+  \newunit{\derradian}{\metre\reciprocal\metre}
+  \newunit{\dersteradian}{\squaremetre\rpsquare\metre}
+  \newunit{\derhertz}{\reciprocal\second}
+  \newunit{\dernewton}{\metre\kilogram\second\rpsquared}
+  \newunit{\derpascal}{\newton\rpsquare\metre}
+  \newunit{\derjoule}{\newton\metre}
+  \newunit{\derwatt}{\joule\reciprocal\second}
+  \newunit{\dercoulomb}{\ampere\second}
+  \newunit{\dervolt}{\watt\reciprocal\ampere}
+  \newunit{\derfarad}{\coulomb\reciprocal\volt}
+  \newunit{\derohm}{\volt\reciprocal\ampere}
+  \newunit{\dersiemens}{\ampere\reciprocal\volt}
+  \newunit{\derweber}
+    {\squaremetre\kilogram\second\rpsquared\reciprocal\ampere}
+  \newunit{\dertesla}{\weber\rpsquare\metre}
+  \newunit{\derhenry}{\weber\reciprocal\ampere}
+  \newunit{\dercelsius}{\kelvin}
+  \newunit{\derlumen}{\candela\steradian}
+  \newunit{\derlux}{\lumen\rpsquare\metre}
+  \newunit{\derbecquerel}{\derhertz}
+  \newunit{\dergray}{\joule\reciprocal\kilogram}
+  \newunit{\dersievert}{\dergray}
+  \newunit{\derkatal}{\rp\second\usk\mole}
+\fi
+\ifsi@old@derivedinbase
+  \newunit{\radianbase}{\metre\reciprocal\metre}
+  \newunit{\steradianbase}{\squaremetre\rpsquare\metre}
+  \newunit{\hertzbase}{\reciprocal\second}
+  \newunit{\newtonbase}{\metre\kilogram\second\rpsquared}
+  \newunit{\pascalbase}{\reciprocal\metre\kilogram\second%
+    \rpsquared}
+  \newunit{\joulebase}{\squaremetre\kilogram\second\rpsquared}
+  \newunit{\wattbase}{\squaremetre\kilogram\rpcubic\second}
+  \newunit{\coulombbase}{\ampere\second}
+  \newunit{\voltbase}
+    {\squaremetre\kilogram\rpcubic\second\reciprocal\ampere}
+  \newunit{\faradbase}
+    {\rpsquare\metre\reciprocal\kilogram\fourth\second\ampere%
+      \squared}
+  \newunit{\ohmbase}
+    {\squaremetre\kilogram\rpcubic\second\rpsquare\ampere}
+  \newunit{\siemensbase}
+    {\rpsquare\metre\reciprocal\kilogram\cubic\second\ampere%
+       \squared}
+  \newunit{\weberbase}
+    {\squaremetre\kilogram\second\rpsquared\reciprocal\ampere}
+  \newunit{\teslabase}{\kilogram\second\rpsquared\reciprocal%
+     \ampere}
+  \newunit{\henrybase}
+    {\squaremetre\kilogram\second\rpsquared\rpsquare\ampere}
+  \newunit{\celsiusbase}{\kelvin}
+  \newunit{\lumenbase}{\candela\squaremetre\rpsquare\metre}
+  \newunit{\luxbase}{\candela\squaremetre\rpfourth\metre}
+  \newunit{\becquerelbase}{\hertzbase}
+  \newunit{\graybase}{\squaremetre\second\rpsquared}
+  \newunit{\sievertbase}{\graybase}
+  \newunit{\katalbase}{\rp\second\mole}
+\fi
+\InputIfFileExists{SIunits.cfg}
+  {\si@log@inf{SIunits config file loaded}}
+  {\si@log@inf{SIunits config file not found}}
+\endinput
+%%
+%% End of file `si-SIunits.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-UK.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-UK.cfg
new file mode 100644
index 00000000000..98aff00edb6
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-UK.cfg
@@ -0,0 +1,27 @@
+%%
+%% This is file `si-UK.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `UK')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-UK.cfg}
+  [\csname si@svn@version\endcsname siunitx: UK locale]
+\sisetup{
+  unitsep=thin,
+  expproduct=times,
+  valuesep=thin,
+  decimalsymbol=fullstop,
+  digitsep=thin,
+  sepfour=false}
+\endinput
+%%
+%% End of file `si-UK.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-USA.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-USA.cfg
new file mode 100644
index 00000000000..b8c5a064809
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-USA.cfg
@@ -0,0 +1,27 @@
+%%
+%% This is file `si-USA.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `USA')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-USA.cfg}
+  [\csname si@svn@version\endcsname siunitx: USA locale]
+\sisetup{
+  unitsep=thin,
+  expproduct=times,
+  valuesep=thin,
+  decimalsymbol=fullstop,
+  digitsep=thin,
+  sepfour=false}
+\endinput
+%%
+%% End of file `si-USA.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-ZA.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-ZA.cfg
new file mode 100644
index 00000000000..f2f0e09f749
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-ZA.cfg
@@ -0,0 +1,28 @@
+%%
+%% This is file `si-ZA.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `ZA')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-ZA.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   South Africa locale]
+\sisetup{
+  unitsep=cdot,
+  valuesep=thin,
+  expproduct=times,
+  decimalsymbol=comma,
+  digitsep=thin,
+  sepfour=false}
+\endinput
+%%
+%% End of file `si-ZA.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-abbr.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-abbr.cfg
new file mode 100644
index 00000000000..bf409115351
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-abbr.cfg
@@ -0,0 +1,73 @@
+%%
+%% This is file `si-abbr.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `abbr')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-abbr.cfg}
+  [\csname si@svn@version\endcsname siunitx: Abbreviated units]
+\requiresiconfigs{prefix,named,accepted,physical}
+\newunit{\pA}{\pico\ampere}
+\newunit{\nA}{\nano\ampere}
+\newunit{\micA}{\micro\ampere}
+\newunit{\mA}{\milli\ampere}
+\newunit{\kA}{\kilo\ampere}
+\newunit{\Hz}{\hertz}
+\newunit{\mHz}{\milli\hertz}
+\newunit{\kHz}{\kilo\hertz}
+\newunit{\MHz}{\mega\hertz}
+\newunit{\GHz}{\giga\hertz}
+\newunit{\THz}{\tera\hertz}
+\newunit{\fmol}{\femto\mole}
+\newunit{\pmol}{\pico\mole}
+\newunit{\nmol}{\nano\mole}
+\newunit{\micmol}{\micro\mole}
+\newunit{\mmol}{\milli\mole}
+\newunit{\kV}{\kilo\volt}
+\newunit{\mV}{\milli\volt}
+\provideunit{\ml}{\milli\litre}
+\provideunit{\micl}{\micro\litre}
+\newunit{\cmc}{\centi\metre\cubed}
+\newunit{\dmc}{\deci\metre\cubed}
+\newunit{\cms}{\centi\metre\squared}
+\newunit{\kg}{\kilo\gram}
+\provideunit{\fg}{\femto\gram}
+\newunit{\pg}{\pico\gram}
+\newunit{\nanog}{\nano\gram}
+\newunit{\micg}{\micro\gram}
+\newunit{\mg}{\milli\gram}
+\newunit{\amu}{\atomicmass}
+\newunit{\kJ}{\kilo\joule}
+\newunit{\eV}{\electronvolt}
+\newunit{\meV}{\milli\electronvolt}
+\newunit{\keV}{\kilo\electronvolt}
+\newunit{\MeV}{\mega\electronvolt}
+\newunit{\GeV}{\giga\electronvolt}
+\newunit{\TeV}{\tera\electronvolt}
+\newunit[unitsep=none]{\kWh}{\kilo\watt\hour}
+\newunit{\picom}{\pico\metre}
+\newunit{\nm}{\nano\metre}
+\newunit{\micm}{\micro\metre}
+\newunit{\mm}{\milli\metre}
+\newunit{\cm}{\centi\metre}
+\newunit{\dm}{\deci\metre}
+\newunit{\km}{\kilo\metre}
+\newunit{\Sec}{\second}
+\newunit{\as}{\atto\second}
+\newunit{\fs}{\femto\second}
+\provideunit{\ps}{\pico\second}
+\newunit{\ns}{\nano\second}
+\newunit{\mics}{\micro\second}
+\newunit{\ms}{\milli\second}
+\endinput
+%%
+%% End of file `si-abbr.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-accepted.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-accepted.cfg
new file mode 100644
index 00000000000..ffe8a8ca0ab
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-accepted.cfg
@@ -0,0 +1,39 @@
+%%
+%% This is file `si-accepted.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `accepted')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-accepted.cfg}
+  [\csname si@svn@version\endcsname siunitx: SI Accepted units]
+\newunit{\minute}{min}
+\newunit{\hour}{h}
+\newunit{\Day}{d}
+\newunit{\dday}{d}
+\ifsi@old@OHM
+  \newunit[valuesep=none]{\Degree}{\si@sym@degree}
+\else
+  \ifsi@gensymb\else
+    \newunit[valuesep=none]{\degree}{\si@sym@degree}
+  \fi
+\fi
+\newunit[valuesep=none]{\arcmin}{\si@sym@minute}
+\newunit[valuesep=none]{\arcsec}{\si@sym@second}
+\newunit{\litre}{l}
+\newunit{\liter}{L}
+\newunit{\tonne}{t}
+\newunit{\neper}{Np}
+\newunit{\bel}{B}
+\newunit{\percent}{\%}
+\endinput
+%%
+%% End of file `si-accepted.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-addn.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-addn.cfg
new file mode 100644
index 00000000000..89dc4487117
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-addn.cfg
@@ -0,0 +1,33 @@
+%%
+%% This is file `si-addn.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `addn')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-addn.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   SI Additional units]
+\newunit{\angstrom}{\si@sym@ringA}
+\newunit{\are}{a}
+\newunit{\hectare}{\hecto\are}
+\newunit{\barn}{b}
+\newunit{\BAR}{bar}
+\newunit{\bbar}{bar}
+\newunit{\millibar}{\milli\BAR}
+\newunit{\gal}{Gal}
+\newunit{\curie}{Ci}
+\newunit{\roentgen}{R}
+\newunit{\rad}{rad}
+\newunit{\rem}{rem}
+\endinput
+%%
+%% End of file `si-addn.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-astro.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-astro.cfg
new file mode 100644
index 00000000000..de516883511
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-astro.cfg
@@ -0,0 +1,23 @@
+%%
+%% This is file `si-astro.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `astro')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-astro.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   Units for astronomy]
+\newunit{\parsec}{pc}
+\newunit{\lightyear}{ly}
+\endinput
+%%
+%% End of file `si-astro.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-binary.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-binary.cfg
new file mode 100644
index 00000000000..110791abbcc
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-binary.cfg
@@ -0,0 +1,30 @@
+%%
+%% This is file `si-binary.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `binary')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-binary.cfg}
+  [\csname si@svn@version\endcsname siunitx: Binary units]
+\newprefix[binary]{\kibi}{10}{Ki}
+\newprefix[binary]{\mebi}{20}{Mi}
+\newprefix[binary]{\gibi}{30}{Gi}
+\newprefix[binary]{\tebi}{40}{Ti}
+\newprefix[binary]{\pebi}{50}{Pi}
+\newprefix[binary]{\exbi}{60}{Ei}
+\newprefix[binary]{\zebi}{70}{Zi}
+\newprefix[binary]{\yobi}{80}{Yi}
+\newunit{\bit}{bit}
+\newunit{\byte}{B}
+\endinput
+%%
+%% End of file `si-binary.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-fancynum.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-fancynum.cfg
new file mode 100644
index 00000000000..b60266bbc01
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-fancynum.cfg
@@ -0,0 +1,48 @@
+%%
+%% This is file `si-fancynum.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `fancynum')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-fancynum.cfg}
+  [\csname si@svn@version\endcsname Emulation of siunitx:
+     fancynum]
+\si@emulating{fancynum}{2000/08/08 0.92}
+\sisetup{decimalsymbol=cdot,digitsep=comma}
+\let\fnum\num
+\newcommand*{\setfnumdsym}[1]{\sisetup{decimalsymbol={#1}}}
+\newcommand*{\setfnumgsym}[1]{\sisetup{digitsep={#1}}}
+\newcommand*{\setfnummsym}[1]{\sisetup{expproduct={#1}}}
+\ifsi@old@english
+  \sisetup{decimalsymbol=cdot,digitsep=comma}
+\fi
+\ifsi@old@french
+  \sisetup{decimalsymbol=comma,digitsep=fullstop}
+\fi
+\ifsi@old@tight
+  \sisetup{expproduct=tighttimes}
+\fi
+\ifsi@old@loose
+  \sisetup{expproduct=times}
+\fi
+\ifsi@old@thinspaces
+  \sisetup{digitsep=thin}
+\fi
+\ifsi@old@commas
+  \sisetup{digitsep=comma}
+\fi
+\ifsi@old@plain
+  \sisetup{digitsep=none}
+\fi
+\endinput
+%%
+%% End of file `si-fancynum.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-fancyunits.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-fancyunits.cfg
new file mode 100644
index 00000000000..b784816341a
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-fancyunits.cfg
@@ -0,0 +1,106 @@
+%%
+%% This is file `si-fancyunits.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `fancyunits')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-fancyunits.cfg}
+  [\csname si@svn@version\endcsname Emulation of siunitx:
+     fancyunits]
+\si@emulating{fancyunits}{2007/02/01 v1.0.1}
+\si@ifloaded{SIunits}
+  {\si@log@err{SIunits emulation loaded\MessageBreak before
+    fancyunits emulation}{You need to load the fancyunits
+    emualtion\MessageBreak code before that for
+    SIunits.\MessageBreak Try emulate=fancyunits as the first
+    option when\MessageBreak loading siunitx}}{}
+\newcommand*{\si@siu@newunithook}[3][]{%
+  \edef\si@tempa{%
+    \expandafter\noexpand\csname #2per#1#3uf\endcsname}%
+  \renewcommand*{\si@tempb}{stickyper,per=fraction,
+    fraction=nice}%
+  \edef\si@tempc{%
+    \noexpand\sisetup{\si@tempb}%
+    \expandafter\noexpand\csname #2\endcsname\noexpand\si@per%
+    \expandafter\noexpand\si@siu@power%
+    \expandafter\noexpand\csname #3\endcsname}%
+  \expandafter\expandafter\expandafter\newunit\expandafter
+    \expandafter\expandafter{\expandafter\si@tempa\expandafter}%
+      \expandafter{\si@tempc}%
+  \edef\si@tempa{%
+    \expandafter\noexpand\csname #2per#1#3Uf\endcsname}%
+  \renewcommand*{\si@tempb}{stickyper,per=fraction,
+    fraction=frac}%
+  \edef\si@tempc{%
+    \noexpand\sisetup{\si@tempb}%
+    \noexpand\def\noexpand\si@frc@hook{\noexpand\textstyle}%
+    \expandafter\noexpand\csname #2\endcsname\noexpand\si@per%
+    \expandafter\noexpand\si@siu@power%
+    \expandafter\noexpand\csname #3\endcsname}%
+  \expandafter\expandafter\expandafter\newunit\expandafter
+    \expandafter\expandafter{\expandafter\si@tempa\expandafter}%
+      \expandafter{\si@tempc}%
+  \edef\si@tempa{%
+    \expandafter\noexpand\csname #2per#1#3UF\endcsname}%
+  \edef\si@tempc{%
+    \noexpand\sisetup{\si@tempb}%
+    \noexpand\def\noexpand\si@frc@hook{\noexpand\displaystyle}%
+    \expandafter\noexpand\csname #2\endcsname\noexpand\si@per%
+    \expandafter\noexpand\si@siu@power%
+    \expandafter\noexpand\csname #3\endcsname}%
+  \expandafter\expandafter\expandafter\newunit\expandafter
+    \expandafter\expandafter{\expandafter\si@tempa\expandafter}%
+      \expandafter{\si@tempc}}
+\newcommand*{\si@siu@newunitxhook}[4]{%
+  \expandafter\newunit\expandafter{\csname #1per#2uf\endcsname}
+    {\sisetup{stickyper,per=fraction,fraction=nice}%
+     #3\si@per#4}%
+  \expandafter\newunit\expandafter{\csname #1per#2Uf\endcsname}
+    {\sisetup{stickyper,per=fraction,fraction=frac}%
+     \renewcommand*{\si@frc@hook}{\textstyle}%
+     #3\si@per#4}%
+  \expandafter\newunit\expandafter{\csname #1per#2UF\endcsname}
+    {\sisetup{stickyper,per=fraction,fraction=frac}%
+     \renewcommand*{\si@frc@hook}{\displaystyle}%
+     #3\si@per#4}}
+\requiresiconfigs{SIunits,addn,astro}
+\sisetup{obeyall}
+\ifsi@old@spaceqspace
+  \sisetup{valuesep=space}
+\fi
+\newunit{\paminute}{'}
+\newunit{\parsecond}{''}
+\newunit{\AstroE}{AE}
+\newunit{\oersted}{OE}
+\provideunit{\ton}{t}
+\let\decaD\decad
+\newcommand*{\ufrac}[2]{%
+  \si[stickyper,per=fraction,fraction=nice]{#1\si@per#2}}
+\newcommand*{\Ufrac}[2]{%
+  \ensuremath{\textstyle{%
+    \si[stickyper,per=fraction,fraction=frac]{#1\si@per#2}}}}
+\newcommand*{\UFrac}[2]{%
+  \ensuremath{\displaystyle{%
+    \si[stickyper,per=fraction,fraction=frac]{#1\si@per#2}}}}
+\let\pow\power
+\let\Squaremetre\squaremetre
+\si@siu@newunit{Gray}{second}
+\si@siu@newunit[square]{Squaremetre}{metre}
+\si@siu@newunitx{Squaremetre}{newtonsecond}{\Square\metre}
+  {\newton\second}
+\si@siu@newunit{Squaremetre}{second}
+\si@siu@newunit[square]{Squaremetre}{squaresecond}
+\si@siu@newunit{Squaremetre}{kilogram}
+\si@siu@newunit[cubic]{Squaremetre}{second}
+\endinput
+%%
+%% End of file `si-fancyunits.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-hep.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-hep.cfg
new file mode 100644
index 00000000000..4e33ed98e37
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-hep.cfg
@@ -0,0 +1,39 @@
+%%
+%% This is file `si-hep.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `hep')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-hep.cfg}
+  [\csname si@svn@version\endcsname siunitx: Units for
+    high-energy physics]
+\requiresiconfigs{prefix,named}
+\provideunit{\micron}{\micro\metre}
+\newunit{\mrad}{\milli\rad}
+\newunit{\gauss}{G}
+\newunit{\clight}{\ensuremath{\mathnormal{c}}}
+\newunit{\eVperc}{\eV\per\clight}
+\newunit{\nanobarn}{\nano\barn}
+\newunit{\picobarn}{\pico\barn}
+\newunit{\femtobarn}{\femto\barn}
+\newunit{\attobarn}{\atto\barn}
+\newunit{\zeptobarn}{\zepto\barn}
+\newunit{\yoctobarn}{\yocto\barn}
+\provideunit{\nb}{\nano\barn}
+\provideunit{\pb}{\pico\barn}
+\provideunit{\fb}{\femto\barn}
+\provideunit{\ab}{\atto\barn}
+\provideunit{\zb}{\zepto\barn}
+\provideunit{\yb}{\yocto\barn}
+\endinput
+%%
+%% End of file `si-hep.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-hepunits.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-hepunits.cfg
new file mode 100644
index 00000000000..42b38b74b46
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-hepunits.cfg
@@ -0,0 +1,71 @@
+%%
+%% This is file `si-hepunits.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `hepunits')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-hepunits.cfg}
+  [\csname si@svn@version\endcsname Emulation of siunitx:
+     hepunits]
+\si@emulating{hepunits}{2007/09/27}
+\requiresiconfigs{SIunits,accepted,prefix,hep}
+\ifsi@old@noprefixcmds\else
+  \newunit{\invbarn}{\per\barn}
+  \newunit{\invnanobarn}{\per\nano\barn}
+  \newunit{\invpicobarn}{\per\pico\barn}
+  \newunit{\invfemtobarn}{\per\femto\barn}
+  \newunit{\invattobarn}{\per\atto\barn}
+  \newunit{\invzeptobarn}{\per\zepto\barn}
+  \newunit{\invyoctobarn}{\per\yocto\barn}
+  \newunit{\invnb}{\per\nano\barn}
+  \newunit{\invpb}{\per\pico\barn}
+  \newunit{\invfb}{\per\femto\barn}
+  \newunit{\invab}{\per\atto\barn}
+  \newunit{\invzb}{\per\zepto\barn}
+  \newunit{\invyb}{\per\yocto\barn}
+\fi
+\newunit{\invcmsqpersecond}{\per\Square\centi\metre\per\second}
+\newunit{\invcmsqpersec}{\per\Square\centi\metre\per\second}
+\newunit{\lumiunits}{\per\Square\centi\metre\per\second}
+\newunit{\inveV}{\per\electronvolt}
+\newunit{\minveV}{\per\milli\electronvolt}
+\newunit{\kinveV}{\per\kilo\electronvolt}
+\newunit{\MinveV}{\per\mega\electronvolt}
+\newunit{\GinveV}{\per\giga\electronvolt}
+\newunit{\TinveV}{\per\tera\electronvolt}
+\newunit[per=slash,eVcorrb=0.6ex]{\eVoverc}
+  {\electronvolt\per\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\eVovercsq}
+  {\electronvolt\per\Square\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\meVoverc}
+  {\milli\electronvolt\per\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\keVoverc}
+  {\kilo\electronvolt\per\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\MeVoverc}
+  {\mega\electronvolt\per\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\GeVoverc}
+  {\giga\electronvolt\per\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\TeVoverc}
+  {\tera\electronvolt\per\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\meVovercsq}
+  {\milli\electronvolt\per\Square\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\keVovercsq}
+  {\kilo\electronvolt\per\Square\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\MeVovercsq}
+  {\mega\electronvolt\per\Square\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\GeVovercsq}
+  {\giga\electronvolt\per\Square\clight}
+\newunit[per=slash,eVcorrb=0.6ex]{\TeVovercsq}
+  {\tera\electronvolt\per\Square\clight}
+\endinput
+%%
+%% End of file `si-hepunits.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-named.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-named.cfg
new file mode 100644
index 00000000000..ef8fe1c3f06
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-named.cfg
@@ -0,0 +1,55 @@
+%%
+%% This is file `si-named.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `named')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-named.cfg}
+  [\csname si@svn@version\endcsname siunitx: SI Named units]
+\newunit{\becquerel}{Bq}
+\newunit{\coulomb}{C}
+\newunit{\farad}{F}
+\newunit{\Gray}{Gy}
+\newunit{\ggray}{Gy}
+\newunit{\hertz}{Hz}
+\newunit{\henry}{H}
+\newunit{\joule}{J}
+\newunit{\katal}{kat}
+\newunit{\lumen}{lm}
+\newunit{\lux}{lx}
+\newunit{\newton}{N}
+\ifsi@old@OHM
+  \newunit{\Ohm}{\si@sym@Omega}
+\else
+  \ifsi@gensymb\else
+    \provideunit{\ohm}{\si@sym@Omega}
+  \fi
+\fi
+\newunit{\pascal}{Pa}
+\newunit{\siemens}{S}
+\newunit{\sievert}{Sv}
+\newunit{\tesla}{T}
+\newunit{\volt}{V}
+\newunit{\watt}{W}
+\newunit{\weber}{Wb}
+\ifsi@old@OHM
+  \newunit{\Celsius}{\si@sym@celsius}
+\else
+  \ifsi@gensymb\else
+    \newunit{\celsius}{\si@sym@celsius}
+  \fi
+\fi
+\newunit{\radian}{rad}
+\newunit{\steradian}{sr}
+\endinput
+%%
+%% End of file `si-named.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-physical.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-physical.cfg
new file mode 100644
index 00000000000..f0f9b580d6e
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-physical.cfg
@@ -0,0 +1,27 @@
+%%
+%% This is file `si-physical.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `physical')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-physical.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   SI Physically-measured units]
+\newcommand*{\si@eVspacea}{\text{\kern-\si@eVcorra}}%
+\newcommand*{\si@eVspaceb}{\text{\kern-\si@eVcorrb}}%
+\newunit{\electronvolt}{e\protect\si@eVspacea V\protect%
+  \si@eVspaceb}
+\newunit{\atomicmass}{u}
+\newunit{\atomicmassunit}{u}
+\endinput
+%%
+%% End of file `si-physical.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-prefix.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-prefix.cfg
new file mode 100644
index 00000000000..882b6985870
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-prefix.cfg
@@ -0,0 +1,50 @@
+%%
+%% This is file `si-prefix.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `prefix')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-prefix.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   SI Multiple prefixes]
+\newprefix{\yocto}{-24}{y}
+\newprefix{\zepto}{-21}{z}
+\newprefix{\atto}{-18}{a}
+\newprefix{\femto}{-15}{f}
+\newprefix{\pico}{-12}{p}
+\newprefix{\nano}{-9}{n}
+\ifsi@old@OHM
+  \newprefix{\Micro}{-6}{\si@sym@mu}
+\else
+  \ifsi@gensymb\else
+    \newprefix{\micro}{-6}{\si@sym@mu}
+  \fi
+\fi
+\newprefix{\milli}{-3}{m}
+\newprefix{\centi}{-2}{c}
+\newprefix{\deci}{-1}{d}
+\newprefix{\deca}{1}{da}
+\newprefix{\hecto}{2}{h}
+\newprefix{\kilo}{3}{k}
+\newprefix{\mega}{6}{M}
+\newprefix{\giga}{9}{G}
+\newprefix{\tera}{12}{T}
+\newprefix{\peta}{15}{P}
+\newprefix{\exa}{18}{E}
+\newprefix{\zetta}{21}{Z}
+\newprefix{\yotta}{24}{Y}
+\newprefix{\deka}{1}{da}
+\newunit{\gram}{g}
+\renewunit{\kilogram}{\kilo\gram}
+\endinput
+%%
+%% End of file `si-prefix.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-prefixed.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-prefixed.cfg
new file mode 100644
index 00000000000..5dce06ba0c8
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-prefixed.cfg
@@ -0,0 +1,103 @@
+%%
+%% This is file `si-prefixed.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `prefixed')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-prefixed.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   SI Prefixed units]
+\requiresiconfigs{prefix,named,accepted,physical}
+\newunit{\picometre}{\pico\metre}
+\newunit{\nanometre}{\nano\metre}
+\newunit{\micrometre}{\micro\metre}
+\newunit{\millimetre}{\milli\metre}
+\newunit{\centimetre}{\centi\metre}
+\newunit{\decimetre}{\deci\metre}
+\newunit{\kilometre}{\kilo\metre}
+\newunit{\femtogram}{\femto\gram}
+\newunit{\picogram}{\pico\gram}
+\newunit{\nanogram}{\nano\gram}
+\newunit{\microgram}{\micro\gram}
+\newunit{\milligram}{\milli\gram}
+\newunit{\femtomole}{\femto\mole}
+\newunit{\picomole}{\pico\mole}
+\newunit{\nanomole}{\nano\mole}
+\newunit{\micromole}{\micro\mole}
+\newunit{\millimole}{\milli\mole}
+\newunit{\attosecond}{\atto\second}
+\newunit{\femtosecond}{\femto\second}
+\newunit{\picosecond}{\pico\second}
+\newunit{\nanosecond}{\nano\second}
+\newunit{\microsecond}{\micro\second}
+\newunit{\millisecond}{\milli\second}
+\newunit{\picoampere}{\pico\ampere}
+\newunit{\nanoampere}{\nano\ampere}
+\newunit{\microampere}{\micro\ampere}
+\newunit{\milliampere}{\milli\ampere}
+\newunit{\kiloampere}{\kilo\ampere}
+\newunit{\millivolt}{\milli\volt}
+\newunit{\kilovolt}{\kilo\volt}
+\newunit{\milliwatt}{\milli\watt}
+\newunit{\kilowatt}{\kilo\watt}
+\newunit{\megawatt}{\mega\watt}
+\newunit{\femtofarad}{\femto\farad}
+\newunit{\picofarad}{\pico\farad}
+\newunit{\nanofarad}{\nano\farad}
+\newunit{\microfarad}{\micro\farad}
+\newunit{\millifarad}{\milli\farad}
+\newunit{\millisiemens}{\milli\siemens}
+\ifsi@old@OHM
+  \newunit{\kiloohm}{\kilo\Ohm}
+  \newunit{\megaohm}{\mega\Ohm}
+  \newunit{\gigaohm}{\giga\Ohm}
+\else
+  \ifsi@gensymb\else
+  \newunit{\kiloohm}{\kilo\ohm}
+  \newunit{\megaohm}{\mega\ohm}
+  \newunit{\gigaohm}{\giga\ohm}
+  \fi
+\fi
+\newunit{\microlitre}{\micro\litre}
+\newunit{\millilitre}{\milli\litre}
+\newunit{\cubicmetre}{\metre\cubed}
+\newunit{\cubiccentimetre}{\centi\metre\cubed}
+\newunit{\centimetrecubed}{\centi\metre\cubed}
+\newunit{\cubicmicrometre}{\micro\metre\cubed}
+\newunit{\cubicmillimetre}{\milli\metre\cubed}
+\newunit{\cubicdecimetre}{\cubic\deci\metre}
+\newunit{\squaremetre}{\Square\metre}
+\newunit{\squarecentimetre}{\Square\centi\metre}
+\newunit{\centimetresquared}{\centi\metre\squared}
+\newunit{\squarekilometre}{\Square\kilo\metre}
+\newunit{\millijoule}{\milli\joule}
+\newunit{\kilojoule}{\kilo\joule}
+\newunit{\megajoule}{\mega\joule}
+\newunit{\millielectronvolt}{\milli\electronvolt}
+\newunit{\kiloelectronvolt}{\kilo\electronvolt}
+\newunit{\megaelectronvolt}{\mega\electronvolt}
+\newunit{\gigaelectronvolt}{\giga\electronvolt}
+\newunit{\teraelectronvolt}{\tera\electronvolt}
+\newunit[unitsep=none]{\kilowatthour}{\kilo\watt\hour}
+\newunit{\millihertz}{\milli\hertz}
+\newunit{\kilohertz}{\kilo\hertz}
+\newunit{\megahertz}{\mega\hertz}
+\newunit{\gigahertz}{\giga\hertz}
+\newunit{\terahertz}{\tera\hertz}
+\newunit{\millinewton}{\milli\newton}
+\newunit{\kilonewton}{\kilo\newton}
+\newunit{\hectopascal}{\hecto\pascal}
+\newunit{\megabecquerel}{\mega\becquerel}
+\newunit{\millisievert}{\milli\sievert}
+\endinput
+%%
+%% End of file `si-prefixed.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-sistyle.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-sistyle.cfg
new file mode 100644
index 00000000000..aca37d6e003
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-sistyle.cfg
@@ -0,0 +1,87 @@
+%%
+%% This is file `si-sistyle.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `sistyle')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-sistyle.cfg}
+  [\csname si@svn@version\endcsname siunitx: Emulation of
+     SIstyle]
+\si@emulating{sistyle}{2006/12/20 v2.3}
+\sisetup{%
+  sepfour=true,
+  obeyfamily,
+  obeyitalic=true,
+  numsign=+-,
+  strictarc=false,
+  unitsep=cdot}
+\newcommand*{\SIobeyboldtrue}{\sisetup{obeybold=true}}
+\newcommand*{\SIobeyboldfalse}{\sisetup{obeybold=false}}
+\let\num\relax
+\si@newrobustcmd*{\num}{%
+  \@ifstar
+    {\si@sis@numstar}
+    {\si@sis@num}}
+\newcommand*{\si@sis@num}[2][]{%
+  \begingroup%
+    \sisetup{#1}%
+    \expandafter\si@out@num\expandafter{\si@num{#2}}%
+  \endgroup}
+\newcommand*{\si@sis@numstar}[2][]{%
+  \begingroup%
+    \sisetup{mode=text,obeybold}%
+    \sisetup{#1}%
+    \expandafter\si@out@num\expandafter{\si@num{#2}}%
+  \endgroup}
+\newcommand*{\pnt}{\ensuremath{\si@decimalsymbol}}
+\newcommand*{\SIgroupfourtrue}{\sisetup{sepfour=true}}
+\newcommand*{\SIgroupfourfalse}{\sisetup{sepfour=false}}
+\newcommand*{\SIunitsep}[1]{\sisetup{valuesep={#1}}}
+\newcommand*{\SIunitspace}[1]{\sisetup{unitspace={#1}}}
+\newcommand*{\SIunitdot}[1]{\sisetup{unitsep={#1}}}
+\newcommand*{\SIdecimalsymbol}[1]{\sisetup{decimalsymbol={#1}}}
+\newcommand*{\SIthousandsep}[1]{\sisetup{digitsep={#1}}}
+\newcommand*{\SIproductsign}[1]{\sisetup{expproduct={#1}}}
+\newcommand*{\SIdecimalsign}[1]{\sisetup{decimalsymbol={#1}}}
+\newcommand*{\si@sis@savefont}[2]{%
+  \@namedef{si@sis@#1}{#2}%
+  \sisetup{#1=si@sis@#1}}
+\newcommand*{\SImathrm}[1]{\si@sis@savefont{mathrm}{#1}}
+\newcommand*{\SImathsf}[1]{\si@sis@savefont{mathsf}{#1}}
+\newcommand*{\SImathtt}[1]{\si@sis@savefont{mathtt}{#1}}
+\newcommand*{\SIdefaultMfam}[1]{\si@sis@savefont{mathrm}{#1}}
+\newcommand*{\SIdefaultNfam}[1]{\si@sis@savefont{mathnumrm}{#1}}
+\newcommand*{\SIdefaultTfam}[1]{\si@sis@savefont{textrm}{#1}}
+\si@newrobustcmd*{\ensureupmath}[1]{%
+  \begingroup
+    \sisetup{mode=maths,obeyitalic=false}%
+    \si@out{#1}%
+  \endgroup}
+\newcommand*{\degC}{\si@sym@celsius}
+\newcommand*{\arcdeg}{\si@sym@degree}
+\newcommand*{\degF}{\si@sym@degree F}
+\newcommand*{\SIstyle}[1]{\sisetup{locale=#1}}
+\newcommand*{\SIstyleToLang}[2]{\sisetup{loctolang=#1:#2}}
+\newcommand*{\AddToSIstyle}{%
+  \si@switchfalse
+  \@ifstar
+    {\si@switchtrue
+     \si@sis@addtolocale}
+    {\si@sis@addtolocale}}
+\newcommand*{\si@sis@addtolocale}[2]{%
+  \ifsi@switch
+    \expandafter\let\csname si@loc@#1@extra\endcsname\relax
+  \fi
+  \addtolocale{#1}{#2}}
+\endinput
+%%
+%% End of file `si-sistyle.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-synchem.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-synchem.cfg
new file mode 100644
index 00000000000..05f3f96d111
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-synchem.cfg
@@ -0,0 +1,27 @@
+%%
+%% This is file `si-synchem.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `synchem')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-synchem.cfg}
+  [\csname si@svn@version\endcsname siunitx: Units for
+     synthetic chemists]
+\requiresiconfigs{prefix}
+\newunit{\mmHg}{mmHg}
+\newunit{\molar}{\mole\per\cubic\deci\metre}
+\newunit{\Molar}{\textsc{m}}
+\newunit{\torr}{Torr}
+\newunit{\dalton}{Da}
+\endinput
+%%
+%% End of file `si-synchem.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-units.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-units.cfg
new file mode 100644
index 00000000000..d1514fdc9e4
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-units.cfg
@@ -0,0 +1,53 @@
+%%
+%% This is file `si-units.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `units')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\si@ifloaded{units}{\endinput}{}
+\ProvidesFile{si-units.cfg}
+  [\csname si@svn@version\endcsname siunitx: Emulation of units]
+\si@emulating{units}{1998/08/04 v0.9b}
+\si@ifloaded{SIunits}
+  {\si@emclash{units}{SIunits}\endinput}{}
+\si@ifloaded{sistyle}
+  {\si@emclash{units}{sistyle}\endinput}{}
+\sisetup{per=fraction,fraction=nice,obeybold,inlinebold=maths,
+  ,obeymode}
+\ifsi@old@tight
+  \sisetup{valuesep=thin}
+\fi
+\ifsi@old@loose
+  \sisetup{valuesep=space}
+\fi
+\ifsi@old@ugly
+  \sisetup{fraction=ugly}
+\fi
+\si@newrobustcmd*{\unit}[2][]{%
+  \ifmmode
+    \SI{#1}{#2}%
+  \else
+    \SI[obeyfamily,obeyitalic]{#1}{#2}%
+  \fi}
+\si@newrobustcmd*{\unitfrac}[3][]{%
+  \begingroup
+    \si@fam@mode%
+    \ifmmode\else
+      \sisetup{obeyfamily,obeyitalic}%
+    \fi
+    \si@ifnotmtarg{#1}
+      {\num{#1}\ensuremath{\si@valuesep}}%
+    \si@frac{#2}{#3}
+  \endgroup}
+\endinput
+%%
+%% End of file `si-units.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/config/si-unitsdef.cfg b/Master/texmf-dist/tex/latex/siunitx/config/si-unitsdef.cfg
new file mode 100644
index 00000000000..6d1575dd091
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/config/si-unitsdef.cfg
@@ -0,0 +1,233 @@
+%%
+%% This is file `si-unitsdef.cfg',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `unitsdef')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\ProvidesFile{si-unitsdef.cfg}
+  [\csname si@svn@version\endcsname siunitx:
+   Emulation of unitsdef]
+\si@emulating{unitsdef}{2005/01/04 v0.2}
+\si@ifloaded{SIunits}
+  {\si@emclash{unitsdef}{SIunits}\endinput}{}
+\si@ifloaded{sistyle}
+  {\si@emclash{unitsdef}{sistyle}\endinput}{}
+\requiresiconfigs{units}
+\RequirePackage{textcomp}
+\RequirePackage[T1]{fontenc}
+\sisetup{mode=text,allowoptarg,prespace}
+\ifsi@old@noxspace
+  \sisetup{xspace=false}
+\fi
+\ifsi@old@noabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@nofrequncyabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@nomolabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@novoltageabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@novolumeabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@noweightabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@noenergyabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@nolengthabbr
+  \sisetup{noload=abbr}
+\fi
+\ifsi@old@notimeabbr
+  \sisetup{noload=abbr}
+\fi
+\newcommand*{\unitvaluesep}{\,}
+\renewcommand*{\si@valuesep}{\text{\unitvaluesep}}
+\define@choicekey*+[si]{key}{valuesep}[\si@tempa]
+  {space,thin,med,medium,thick,none}
+  {\renewcommand*\unitvaluesep\@nameuse{si@fix@##1}%
+   \si@log@debug{Option valuesep set to ##1}}
+  {\si@log@debug{Option valuesep set to ##1}%
+   \renewcommand*\unitvaluesep{##1}}
+\let\unitsignonly\si
+\si@newrobustcmd*{\ilu}[2][]{%
+  \begingroup
+    #1\unitvaluesep%
+    \unit{#2}%
+  \endgroup}
+\let\arc\ang
+\newcommand*{\unitSIdef}{\upshape}
+\newcommand*{\si@unitSIdef}{\unitSIdef\selectfont}
+\sisetup{textrm=si@unitSIdef}
+\let\per\relax
+\si@newrobustcmd*{\per}[2]{%
+  \begingroup
+    \si@xspacefalse
+    \renewcommand*{\unitvaluesep}{}%
+    \unitfrac{#1}{#2}%
+  \endgroup}
+\newcommand*{\unittimes}{\ensuremath{\cdot}}
+\newcommand*{\unitsep}{\,}
+\renewcommand*{\si@unt@unithook}{\si@unt@litouttrue}
+\sisetup{unitsep=none}
+\newcommand*{\unitsuperscript}{\tothe}
+\newcommand*{\newnosepunit}{\newunit[valuesep=none]}
+\newcommand*{\renewnosepunit}{\renewunit[valuesep=none]}
+\newcommand*{\setTextOmega}[2]{%
+  \renewcommand*{\si@textOmega}{%
+      \begingroup
+      \edef\si@tempa{\sfdefault}%
+      \ifx\f@family\si@tempa
+        \expandafter#2%
+      \else
+        \expandafter#1%
+      \fi
+    \endgroup}}
+\newcommand*{\setMathOmega}[1]{\sisetup{mathsOmega=#1}}
+\newcommand*{\setTextmu}[2]{%
+  \renewcommand*{\si@textmu}{%
+    \begingroup
+      \edef\si@tempa{\sfdefault}%
+      \ifx\f@family\si@tempa
+        \expandafter#2%
+      \else
+        \expandafter#1%
+      \fi
+    \endgroup}}
+\newcommand*{\setMathmu}[1]{\sisetup{mathsmu=#1}}
+\newcommand*{\setTextCelsius}[2]{%
+  \renewcommand*{\si@textcelsius}{%
+    \begingroup
+      \edef\si@tempa{\sfdefault}%
+      \ifx\f@family\si@tempa
+        \expandafter#2%
+      \else
+        \expandafter#1%
+      \fi
+    \endgroup}}
+\newcommand*{\setMathCelsius}[1]{\sisetup{mathscelsius=#1}}
+\newcommand*{\setMathDegree}[2]{%
+  \renewcommand*{\si@textdegree}{%
+    \begingroup%
+      \edef\si@tempa{\sfdefault}%
+      \ifx\f@family\si@tempa
+        \expandafter#2%
+      \else
+        \expandafter#1%
+      \fi
+    \endgroup}}
+\newcommand*{\setTextDegree}[1]{\sisetup{textdegree=#1}}
+\ifsi@old@OHM
+  \ifsi@old@ohm
+    \si@log@inf{Both `ohm' and `OHM' options given\MessageBreak
+      Using default behaviour for unitsdef}
+    \expandafter\expandafter\expandafter\si@old@OHMfalse
+  \fi
+\fi
+\ifsi@old@liter
+  \ifsi@old@LITER
+    \si@log@inf{Both `liter' and `LITER' options
+      given\MessageBreak Using default behaviour for unitsdef}
+  \else
+    \renewunit{\liter}{l}
+  \fi
+\fi
+\newunit{\ton}{t}
+\newunit{\days}{d}
+\newunit{\picometer}{\pico\meter}
+\newunit{\nanometer}{\nano\meter}
+\newunit{\micrometer}{\micro\meter}
+\newunit{\millimeter}{\milli\meter}
+\newunit{\centimeter}{\centi\meter}
+\newunit{\decimeter}{\deci\meter}
+\newunit{\kilometer}{\kilo\meter}
+\newunit{\femtoliter}{\femto\liter}
+\newunit{\picoliter}{\pico\liter}
+\newunit{\nanoliter}{\nano\liter}
+\newunit{\microliter}{\micro\liter}
+\newunit{\milliliter}{\milli\liter}
+\newunit{\centiliter}{\centi\liter}
+\newunit{\deciliter}{\deci\liter}
+\newunit{\hectoliter}{\hecto\liter}
+\newunit{\cubicmeter}{\meter\cubed}
+\newunit{\cubicmicrometer}{\micro\meter\cubed}
+\newunit{\cubicmillimeter}{\milli\meter\cubed}
+\newunit{\squaremeter}{\Square\meter}
+\newunit{\squarecentimeter}{\Square\centi\meter}
+\newunit{\squarekilometer}{\Square\kilo\meter}
+\newunit{\ar}{a}
+\newunit{\hectar}{\hecto\ar}
+\ifsi@old@noabbr
+\else
+  \ifsi@old@novoltageabbr\else
+    \newunit{\kv}{\kilo\volt}
+    \newunit{\mv}{\milli\volt}
+  \fi
+\fi
+\ifsi@old@noabbr\else
+  \ifsi@old@notimeabbr\else
+    \newunit{\sek}{\second}
+  \fi
+  \ifsi@old@noweightabbr\else
+    \newunit{\fg}{\femto\gram}
+  \fi
+  \ifsi@old@novolumeabbr\else
+    \newunit{\fl}{\femto\liter}
+    \newunit{\pl}{\pico\liter}
+    \newunit{\nl}{\nano\liter}
+    \newunit{\micl}{\micro\liter}
+    \newunit{\ml}{\milli\liter}
+    \newunit{\cl}{\centi\liter}
+    \newunit{\dl}{\deci\liter}
+    \newunit{\hl}{\hecto\liter}
+  \fi
+\fi
+\newunit{\calory}{cal}
+\newunit{\kilocalory}{\kilo\calory}
+\newunit{\uBar}{ba}
+\catcode`\-=11\relax
+\ifsi@old@redef-gensymb
+  \expandafter\si@gensymbtrue
+\fi
+\catcode`\-=12\relax
+\ifsi@gensymb
+  \RequirePackage{gensymb}
+  \AtBeginDocument{
+    \let\gensymbohm\ohm
+    \let\gensymbcelsius\celsius
+    \let\gensymbmicro\micro
+    \let\gensymbdegree\degree
+    \let\ohm\@undefined
+    \let\celsius\@undefined
+    \let\micro\@undefined
+    \let\degree\@undefined
+    \ifsi@old@OHM\else
+      \newunit{\ohm}{\si@sym@Omega}
+      \newunit{\celsius}{\si@sym@celsius}
+      \newprefix{\micro}{\si@sym@mu}{-6}
+      \newunit{\degree}{\si@sym@degree}
+    \fi}
+\fi
+\requiresiconfigs{prefix,named,addn,accepted}
+\ifsi@old@noconfig\else
+  \InputIfFileExists{unitsdef.cfg}
+    {\si@log@inf{unitsdef config file loaded}}
+    {\si@log@inf{unitsdef config file not found}}
+\fi
+\endinput
+%%
+%% End of file `si-unitsdef.cfg'.
diff --git a/Master/texmf-dist/tex/latex/siunitx/siunitx.sty b/Master/texmf-dist/tex/latex/siunitx/siunitx.sty
new file mode 100644
index 00000000000..a51067b4669
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/siunitx/siunitx.sty
@@ -0,0 +1,3509 @@
+%%
+%% This is file `siunitx.sty',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% siunitx.dtx  (with options: `package')
+%%  ----------------------------------------------------------------
+%%  The siunitx package --- A comprehensive (SI) units package
+%%  Maintained by Joseph Wright
+%%  E-mail: joseph.wright@morningstar2.co.uk
+%%  Released under the LaTeX Project Public License v1.3c or later
+%%  See http://www.latex-project.org/lppl.txt
+%%  ----------------------------------------------------------------
+%% 
+\NeedsTeXFormat{LaTeX2e}
+\newcommand*{\si@svn@ver}{v1.0}
+\def\si@svn@id$#1: #2.#3 #4 #5-#6-#7 #8 #9${%
+  \newcommand*{\si@svn@version}{%
+    #5/#6/#7\space\si@svn@ver\space}}
+\si@svn@id $Id: siunitx.dtx 76 2008-06-15 08:10:34Z joseph $
+\ProvidesPackage{siunitx}
+  [\si@svn@version A comprehensive (SI) units package]
+\begingroup
+  \@ifundefined{eTeXversion}
+    {\PackageError{siunitx}
+       {Not running under e-TeX}
+       {This package requires e-TeX. Try compiling the document
+        with\MessageBreak `elatex' instead of `latex'. When
+        using pdfTeX, try `pdfelatex'\MessageBreak instead of
+        `pdflatex'}%
+     \endgroup\endinput}
+    {\endgroup}
+\edef\si@catcodes{%
+  \catcode\string`\string ` \the\catcode\string`\`\relax
+  \catcode\string`\string = \the\catcode\string`\=\relax
+  \catcode\string`\string ^ \the\catcode\string`\^\relax
+  \catcode\string`\string ~ \the\catcode\string`\~\relax
+  \catcode\string`\string : \the\catcode\string`\:\relax
+  \catcode\string`\string - \the\catcode\string`\-\relax
+  \catcode\string`\string + \the\catcode\string`\+\relax
+  \catcode\string`\string ; \the\catcode\string`\;\relax
+  \catcode\string`\string , \the\catcode\string`\,\relax
+  \catcode\string`\string . \the\catcode\string`\.\relax}
+\catcode\string`\` 12\relax
+\catcode`\= 12\relax
+\catcode`\^ 7\relax
+\catcode`\~ \active\relax
+\@makeother{\:}
+\@makeother{\-}
+\@makeother{\+}
+\@makeother{\;}
+\@makeother{\,}
+\@makeother{\.}
+\RequirePackage{xkeyval}[2005/05/07]
+\RequirePackage{amstext,array,xspace}
+\newcommand*{\si@tempa}{}
+\newcommand*{\si@tempb}{}
+\newcommand*{\si@tempc}{}
+\newif\ifsi@switch
+\newbox\si@tempboxa
+\newbox\si@tempboxb
+\newbox\si@tempboxc
+\newbox\si@tempboxd
+\newcommand*{\si@blockpkgs}{SIunits,sistyle,siunits,SIstyle,%
+  unitsdef,fancyunits}
+\newcommand*{\si@checkpkgs}{units,hepunits,fancynum}
+\newcommand*{\si@packagecheck}{%
+  \begingroup
+  \@for\si@tempa:=\si@blockpkgs\do{
+    \@ifpackageloaded{\si@tempa}
+      {\PackageError{siunitx}
+         {Package `\si@tempa' incompatible}
+         {The \si@tempa\space package and siunitx are
+          incompatible.\MessageBreak Use the
+          `emulate=\si@tempa' package option when loading
+          siunitx}}
+      {}}
+  \@for\si@tempa:=\si@checkpkgs\do{%
+    \@ifpackageloaded{\si@tempa}
+      {\PackageWarning{siunitx}
+         {Consider loading the siunitx package
+          with\MessageBreak option `emulate=\si@tempa', rather
+          than\MessageBreak loading both \si@tempa\space and
+          siunitx}}
+      {}}
+  \endgroup}
+\si@packagecheck
+\AtBeginDocument{\si@packagecheck}
+\newcommand*{\si@ifdefinable}[1]{%
+  \expandafter\expandafter\expandafter\@ifundefined%
+    \expandafter\expandafter\expandafter%
+      {\expandafter\@gobble\string#1}}
+\newcommand*{\si@addtolist}[2]{%
+  \ifx\@empty#1\@empty
+    \edef#1{#2}%
+  \else
+    \edef#1{#1,#2}%
+  \fi}
+\newtoks{\si@temptoks}
+\newcommand*{\si@addtocsname}[2]{%
+  \@ifundefined{#1}
+    {\expandafter\gdef\csname #1\endcsname{#2}}
+    {\si@temptoks\expandafter\expandafter\expandafter{%
+       \csname #1\endcsname#2}%
+     \expandafter\xdef\csname #1\endcsname{\the\si@temptoks}}}
+\begingroup
+  \catcode`\Q=3
+  \long\gdef\si@ifmtarg#1{%
+    \si@xifmtarg#1QQ\@secondoftwo\@firstoftwo\@nil}
+  \long\gdef\si@xifmtarg#1#2Q#3#4#5\@nil{#4}
+  \long\gdef\si@ifnotmtarg#1{%
+    \si@xifmtarg#1QQ\@firstofone\@gobble\@nil}
+\endgroup
+\@ifpackageloaded{etoolbox}
+  {\let\si@newrobustcmd\newrobustcmd}
+  {\protected\def\si@newrobustcmd{%
+     \@ifstar
+       {\let\l@ngrel@x\protected\si@newcommand}
+       {\def\l@ngrel@x{\protected\long}\si@newcommand}}
+   \newcommand*{\si@newcommand}[1]{\@testopt{\si@newcmd#1}0}
+   \def\si@newcmd#1[#2]{%
+     \@ifnextchar[%]
+       {\si@xargdef#1[#2]}
+       {\@argdef#1[#2]}}
+   \long\def\si@xargdef#1[#2][#3]#4{%
+     \@ifdefinable#1{%
+       \expandafter\protected
+       \expandafter\def
+       \expandafter#1%
+       \expandafter{%
+         \expandafter\@testopt
+         \csname\string#1\endcsname{#3}}%
+       \expandafter\@yargdef
+       \csname\string#1\endcsname\tw@{#2}{#4}}}}
+\newif\ifsi@debug
+\newif\ifsi@logmin
+\newif\ifsi@lognone
+\newcommand*{\si@log@err}[2]{%
+  \ifsi@lognone\else
+    \ifsi@logmin
+      \PackageWarning{siunitx}{#1}%
+    \else
+      \PackageError{siunitx}{#1}{#2}%
+    \fi
+  \fi}
+\newcommand*{\si@log@warn}[1]{%
+  \ifsi@lognone\else
+    \ifsi@logmin\else
+      \PackageWarning{siunitx}{#1}%
+    \fi
+  \fi}
+\newcommand*{\si@log@inf}[1]{%
+  \ifsi@lognone\else
+    \ifsi@logmin\else
+      \PackageInfo{siunitx}{#1}%
+    \fi
+  \fi}
+\newcommand*{\si@log@debug}[1]{%
+  \ifsi@lognone\else
+    \ifsi@debug
+      \PackageInfo{siunitx}{#1}%
+    \fi
+  \fi}
+\newcommand*{\si@str@ifchrstr}[2]{%
+  \begingroup
+    \si@switchfalse
+    \renewcommand*{\si@tempa}{#1}%
+    \protected@edef\si@tempb{#2}%
+    \expandafter\si@str@chrstr\si@tempb\@empty\@empty\@empty
+    \ifsi@switch
+      \aftergroup\@firstoftwo
+    \else
+      \aftergroup\@secondoftwo
+    \fi
+  \endgroup}
+\def\si@str@chrstr#1#2\@empty{%
+  \renewcommand*{\si@tempc}{#1}%
+  \ifx\si@tempa\si@tempc
+    \expandafter\si@switchtrue
+  \else
+    \ifx\@empty#2\@empty\else
+      \si@str@chrstr#2\@empty\@empty
+    \fi
+  \fi}
+\newcommand*{\si@str@ifonlychrs}[2]{%
+  \begingroup
+    \si@switchtrue
+    \protected@edef\si@tempa{#1}%
+    \renewcommand*{\si@tempb}{#2}%
+    \expandafter\si@str@onlychrs\si@tempa\@empty\@empty\@empty
+    \ifsi@switch
+      \aftergroup\@firstoftwo
+    \else
+      \aftergroup\@secondoftwo
+    \fi
+  \endgroup}
+\def\si@str@onlychrs#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@tempb}
+    {}{\si@switchfalse}%
+  \ifx\@empty#2\@empty\else
+    \si@str@onlychrs#2\@empty\@empty
+  \fi}
+\newcommand*{\sisetup}{\setkeys[si]{key}}
+\newcommand*{\si@opt@key}[2]{%
+  \define@key[si]{key}{#1}
+  {#2\si@log@debug{Option #1 set to ##1}}}
+\newcommand*{\si@opt@cmdkey}[3][]{%
+  \define@cmdkey[si]{key}[si@]{#2}[#1]{#3}}
+\newcommand*{\si@opt@cmdkeys}[2][]{%
+  \define@cmdkeys[si]{key}[si@]{#2}[#1]}
+\newcommand*{\si@opt@boolkey}[2][]{%
+  \define@boolkey[si]{key}[si@]{#2}[true]
+  {#1\si@log@debug{Option #2 set to ##1}}}
+\newcommand*{\si@opt@choicekey}[4][]{%
+  \define@choicekey*+[si]{key}{#2}[\si@tempa]{#3}[#1]
+    {#4\si@log@debug{Option #2 set to ##1}}
+    {\si@log@warn{Unknown value `##1' for option #2}}}
+\newcommand*{\si@opt@xchoicekey}[3]{%
+  \define@choicekey*+[si]{key}{#1}[\si@tempa]{#2}[#1]
+    {\si@log@debug{Option #1 set to ##1}%
+     \expandafter\renewcommand\expandafter*\expandafter{%
+      \csname si@#1\endcsname}{\@nameuse{si@fix@##1}}}
+    {\si@log@debug{Option #1 set to ##1}%
+     \expandafter\renewcommand\expandafter*\expandafter{%
+      \csname si@#1\endcsname}{##1}}
+  \expandafter\newcommand\expandafter*\expandafter{%
+    \csname si@#1\endcsname}%
+    {\@nameuse{si@fix@#3}}}
+\newcommand*{\si@opt@compatkey}[2]{%
+  \define@boolkey[si]{key}[si@old@]{#2}[true]
+  {\si@log@debug{Emulating #1 package option\MessageBreak #2}%
+   \sisetup{emulate=#1}%
+   \si@log@debug{Option #2 set to ##1}}
+   \AtEndOfPackage{\si@opt@disablekey{#2}
+     {Compatibility option #2 only\MessageBreak
+        available when loading siunitx package}}}
+\newcommand*{\si@opt@disablekey}[2]{%
+  \key@ifundefined[si]{key}{#1}
+    {}
+    {\si@log@debug{Disabling key #1}%
+     \si@opt@key{#1}{\si@log@warn{#2}}}}
+\si@opt@choicekey[normal]{log}{debug,verbose,normal,errors,none}
+  {\si@debugfalse
+   \si@logminfalse
+   \si@lognonefalse
+   \renewcommand*{\si@tempb}{none}%
+   \ifx\si@tempa\si@tempb
+     \si@lognonetrue
+   \fi
+   \renewcommand*{\si@tempb}{minimal}%
+   \ifx\si@tempa\si@tempb
+     \si@logmintrue
+   \fi
+   \renewcommand*{\si@tempb}{debug}%
+   \ifx\si@tempa\si@tempb
+     \si@debugtrue
+   \fi
+   \renewcommand*{\si@tempb}{verbose}%
+   \ifx\si@tempa\si@tempb
+     \si@debugtrue
+   \fi}
+\si@opt@boolkey{debug}
+\si@opt@boolkey[%
+  \ifsi@strict
+    \sisetup{
+      obeymode=false,
+      obeybold=false,
+      obeyitalic=false,
+      mode=maths,
+      repeatunits=true,
+      trapambigerr=true,
+      trapambigfrac=true}
+    \@for\si@tempa:=obeyall,obeymode,obeyitalic,mode,unitmode,%
+      valuemode,textmode,obeybold,repeatunits,trapambigerr,%
+      trapambigfrac\do{%
+      \begingroup
+        \edef\si@tempb{\endgroup
+          \noexpand\si@opt@disablekey{\si@tempa}
+          {Option `\si@tempa' forbidden in strict mode}}%
+      \si@tempb}
+  \fi]{strict}
+\AtEndOfPackage{
+  \si@opt@disablekey{strict}
+    {Option `strict' only available when\MessageBreak
+     loading package}}
+\newcommand*{\si@emulate}{}
+\si@opt@key{emulate}{\si@addtolist{\si@emulate}{#1}}
+\AtEndOfPackage{
+  \si@opt@disablekey{emulate}
+    {Option `emulate' only available when\MessageBreak
+     loading package}}
+\si@opt@xchoicekey{unitsep}
+  {thin,med,medium,thick,none,comma,stop,fullstop,period,
+    times,tighttimes,cdot,tightcdot}{thin}
+\si@opt@xchoicekey{unitspace}{space,thin,med,medium,thick,
+  none}{thin}
+\si@opt@xchoicekey{errspace}{space,thin,med,medium,thick,
+  none}{none}
+\si@opt@xchoicekey{valuesep}
+  {thin,med,medium,thick,none,comma,stop,fullstop,period,
+    times,tighttimes,cdot,tightcdot}{thin}
+\si@opt@xchoicekey{digitsep}
+  {thin,med,medium,thick,none,comma,stop,fullstop,period,
+    times,tighttimes,cdot,tightcdot}{thin}
+\si@opt@xchoicekey{decimalsymbol}{comma,stop,fullstop,period,
+  cdot,tightcdot}{fullstop}
+\si@opt@xchoicekey{anglesep}
+    {thin,med,medium,thick,none,comma,stop,fullstop,period,
+      times,tighttimes,cdot,tightcdot}{none}
+\si@opt@boolkey{obeymode}
+\newif\ifsi@numtextmode
+\newif\ifsi@unittextmode
+\si@opt@choicekey[true]{textmode}{true,false}
+  {\si@numtextmodefalse
+   \si@unittextmodefalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@numtextmodetrue
+     \si@unittextmodetrue
+   \fi}
+\si@opt@choicekey{mode}{math,maths,text}
+  {\si@numtextmodefalse
+   \si@unittextmodefalse
+   \renewcommand*{\si@tempb}{text}%
+   \ifx\si@tempa\si@tempb
+     \si@numtextmodetrue
+     \si@unittextmodetrue
+   \fi}
+\si@opt@choicekey{valuemode}{math,maths,text}
+  {\si@numtextmodefalse
+   \renewcommand*{\si@tempb}{text}%
+   \ifx\si@tempa\si@tempb
+     \si@numtextmodetrue
+   \fi}
+\si@opt@choicekey{unitmode}{math,maths,text}
+  {\si@unittextmodefalse
+   \renewcommand*{\si@tempb}{text}%
+   \ifx\si@tempa\si@tempb
+     \si@unittextmodetrue
+   \fi}
+\si@opt@boolkey{obeyfamily}
+\si@opt@boolkey{obeybold}
+\newif\ifsi@inlinebtext
+\si@opt@choicekey{inlinebold}{text,maths,math}
+  {\si@inlinebtextfalse
+   \renewcommand*{\si@tempb}{text}%
+   \ifx\si@tempa\si@tempb
+     \si@inlinebtexttrue
+   \fi}
+\si@opt@boolkey{obeyitalic}
+\si@opt@boolkey{detectdisplay}
+\si@opt@choicekey[true]{obeyall}{true,false}
+  {\si@obeyboldfalse
+   \si@obeyitalicfalse
+   \si@obeymodefalse
+   \si@obeyfamilyfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@obeyboldtrue
+     \si@obeyitalictrue
+     \si@obeymodetrue
+     \si@obeyfamilytrue
+   \fi}
+\si@opt@cmdkeys{valuemathsrm,valuemathssf,valuemathstt}
+\si@opt@cmdkeys{unitmathsrm,unitmathssf,unitmathstt}
+\si@opt@key{valuemathrm}{\sisetup{valuemathsrm=#1}}
+\si@opt@key{valuemathsf}{\sisetup{valuemathssf=#1}}
+\si@opt@key{valuemathtt}{\sisetup{valuemathstt=#1}}
+\si@opt@key{unitmathrm}{\sisetup{unitmathsrm=#1}}
+\si@opt@key{unitmathsf}{\sisetup{unitmathssf=#1}}
+\si@opt@key{unitmathtt}{\sisetup{unitmathstt=#1}}
+\si@opt@key{mathsrm}{\sisetup{valuemathsrm=#1,unitmathsrm=#1}}
+\si@opt@key{mathssf}{\sisetup{valuemathssf=#1,unitmathssf=#1}}
+\si@opt@key{mathstt}{\sisetup{valuemathstt=#1,unitmathstt=#1}}
+\si@opt@key{mathrm}{\sisetup{valuemathsrm=#1,unitmathsrm=#1}}
+\si@opt@key{mathsf}{\sisetup{valuemathssf=#1,unitmathssf=#1}}
+\si@opt@key{mathtt}{\sisetup{valuemathstt=#1,unitmathstt=#1}}
+\si@opt@cmdkeys{valuetextrm,valuetextsf,valuetexttt}
+\si@opt@cmdkeys{unittextrm,unittextsf,unittexttt}
+\si@opt@key{textrm}{\sisetup{unittextrm=#1,valuetextrm=#1}}
+\si@opt@key{textsf}{\sisetup{unittextsf=#1,valuetextsf=#1}}
+\si@opt@key{texttt}{\sisetup{unittexttt=#1,valuetexttt=#1}}
+\si@opt@cmdkeys{numdigits,numdecimal,numexp,numgobble,numsign,%
+  numcloseerr,numopenerr,numaddn,numprod}
+\newcommand*{\si@numextra}{%
+  \si@numopenerr\si@numcloseerr\si@numaddn}
+\newcommand*{\si@numvalid}{\si@numgobble\si@numexp\si@numsign
+  \si@numdecimal\si@numdigits\si@numextra\si@numprod}
+\si@opt@boolkey{seperr}
+\si@opt@boolkey{trapambigerr}
+\si@opt@cmdkeys{openerr,closeerr}
+\si@opt@boolkey{sepfour}
+\si@opt@boolkey{retainplus}
+\si@opt@xchoicekey{expproduct}{times,tighttimes,
+  cdot,tightcdot}{times}
+\si@opt@xchoicekey{expbase}{ten}{ten}
+\si@opt@boolkey{allowzeroexp}
+\si@opt@xchoicekey{prefixproduct}{times,tighttimes,cdot,
+  tightcdot,none}{times}
+\si@opt@xchoicekey{prefixbase}{ten,two}{ten}
+\si@opt@boolkey{prefixsymbolic}
+\newif\ifsi@num@padlead
+\newif\ifsi@num@padtrail
+\si@opt@choicekey[all]{padnumber}
+  {leading,lead,trailing,trail,all,both,true,none,false}
+  {\si@num@padleadfalse
+   \si@num@padtrailfalse
+   \renewcommand*{\si@tempb}{leading}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padleadtrue
+   \fi
+   \renewcommand*{\si@tempb}{lead}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padleadtrue
+   \fi
+   \renewcommand*{\si@tempb}{trailing}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padtrailtrue
+   \fi
+   \renewcommand*{\si@tempb}{trail}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padtrailtrue
+   \fi
+   \renewcommand*{\si@tempb}{all}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padleadtrue
+     \si@num@padtrailtrue
+   \fi
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padleadtrue
+     \si@num@padtrailtrue
+   \fi
+   \renewcommand*{\si@tempb}{both}%
+   \ifx\si@tempa\si@tempb
+     \si@num@padleadtrue
+     \si@num@padtrailtrue
+   \fi}
+\newif\ifsi@num@signmant
+\newif\ifsi@num@signexp
+\si@opt@xchoicekey{sign}{plus,minus,pm,mp}{plus}
+\si@opt@choicekey[all]{addsign}
+  {mantissa,exponent,mant,exp,all,both,true,none,false}
+  {\si@num@signmantfalse
+   \si@num@signexpfalse
+   \renewcommand*{\si@tempb}{mantissa}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signmanttrue
+   \fi
+   \renewcommand*{\si@tempb}{mant}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signmanttrue
+   \fi
+   \renewcommand*{\si@tempb}{exponent}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signexptrue
+   \fi
+   \renewcommand*{\si@tempb}{exp}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signexptrue
+   \fi
+   \renewcommand*{\si@tempb}{all}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signmanttrue
+     \si@num@signexptrue
+   \fi
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signmanttrue
+     \si@num@signexptrue
+   \fi
+   \renewcommand*{\si@tempb}{both}%
+   \ifx\si@tempa\si@tempb
+     \si@num@signmanttrue
+     \si@num@signexptrue
+   \fi}
+\si@opt@boolkey{tightpm}
+\newcommand*{\si@pm}{%
+  \ifsi@tightpm
+    \si@fix@tightpm
+  \else
+    \si@fix@pm
+  \fi}
+\newif\ifsi@ang@padsmall
+\newif\ifsi@ang@padlarge
+\si@opt@choicekey[all]{padangle}
+  {small,large,all,both,true,none,false}
+  {\si@ang@padsmallfalse
+   \si@ang@padlargefalse
+   \renewcommand*{\si@tempb}{small}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@padsmalltrue
+   \fi
+   \renewcommand*{\si@tempb}{large}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@padlargetrue
+   \fi
+   \renewcommand*{\si@tempb}{all}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@padsmalltrue
+     \si@ang@padlargetrue
+   \fi
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@padsmalltrue
+     \si@ang@padlargetrue
+   \fi
+   \renewcommand*{\si@tempb}{both}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@padsmalltrue
+     \si@ang@padlargetrue
+   \fi}
+\newif\ifsi@ang@toarc
+\newif\ifsi@ang@todec
+\si@opt@choicekey[all]{angformat}
+  {dec,decimal,arc,dms,unchanged,none}
+  {\si@ang@toarcfalse
+   \si@ang@todecfalse
+   \renewcommand*{\si@tempb}{dec}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@todectrue
+   \fi
+   \renewcommand*{\si@tempb}{decimal}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@todectrue
+   \fi
+   \renewcommand*{\si@tempb}{arc}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@toarctrue
+   \fi
+   \renewcommand*{\si@tempb}{dms}%
+   \ifx\si@tempa\si@tempb
+     \si@ang@toarctrue
+   \fi}
+\si@opt@boolkey{astroang}
+\si@opt@boolkey{strictarc}
+\newif\ifsi@tab@fixed
+\si@opt@choicekey{tabnumalign}
+  {centredecimal,centerdecimal,right,left,centre,center}
+  {\si@tab@fixedtrue
+   \let\si@tab@rfill@S\hfil
+   \let\si@tab@lfill@S\hfil
+   \renewcommand*{\si@tempb}{right}%
+   \ifx\si@tempa\si@tempb
+     \let\si@tab@lfill@S\hfill
+   \fi
+   \renewcommand*{\si@tempb}{left}%
+   \ifx\si@tempa\si@tempb
+     \let\si@tab@rfill@S\hfill
+   \fi
+   \renewcommand*{\si@tempb}{centredecimal}%
+   \ifx\si@tempa\si@tempb
+     \expandafter\si@tab@fixedfalse
+   \fi
+   \renewcommand*{\si@tempb}{centerdecimal}%
+   \ifx\si@tempa\si@tempb
+     \expandafter\si@tab@fixedfalse
+   \fi}
+\si@opt@key{tabalign}{\sisetup{tabnumalign=#1,tabtextalign=#1,
+  tabunitalign=#1}}
+\si@opt@boolkey{tabalignexp}
+\newcount\si@tab@mantprecnt
+\newcount\si@tab@mantpostcnt
+\newcount\si@tab@expprecnt
+\newcount\si@tab@exppostcnt
+\newif\ifsi@tab@mantsign
+\newif\ifsi@tab@expsign
+\si@opt@cmdkey{tabformat}
+  {\si@num@fixpm
+   \renewcommand*{\si@num@arg}{tabformat data}%
+   \renewcommand*{\si@num@exp}{}%
+   \renewcommand*{\si@num@mant}{}%
+   \si@tab@mantsignfalse
+   \si@tab@expsignfalse
+   \si@switchfalse
+   \si@num@sepmantexp{#1}%
+   \si@num@sepsign{mant}%
+   \ifx\@empty\si@num@mantsign\@empty
+     \ifsi@num@delplus
+       \expandafter\expandafter\expandafter\si@tab@mantsigntrue
+     \fi
+   \else
+     \expandafter\si@tab@mantsigntrue
+   \fi
+   \si@num@sepsign{exp}%
+   \ifx\@empty\si@num@expsign\@empty
+     \ifsi@num@delplus
+       \expandafter\expandafter\expandafter\si@tab@expsigntrue
+     \fi
+   \else
+     \expandafter\si@tab@expsigntrue
+   \fi
+   \si@opt@proctform{mant}%
+   \si@opt@proctform{exp}%
+   \ifnum\si@tab@mantpostcnt=\z@\relax
+     \ifnum\si@tab@mantprecnt=\z@\relax
+       \si@log@err{Empty mantissa argument for tabformat}
+         {The argument `#1' contains no valid entry for
+          a mantissa\MessageBreak It should be of the
+          form `m.n', where  m and n are integers}%
+     \else
+       \si@log@warn{Argument of tabformat contains\MessageBreak
+         no decimal part}%
+     \fi
+   \else
+     \ifnum\si@tab@mantprecnt=\z@\relax
+       \si@log@warn{Argument of tabformat contains\MessageBreak
+         no integer part}%
+     \fi
+   \fi
+   \ifsi@tab@fixed\else
+     \sisetup{tabnumalign=centre}%
+   \fi
+   \let\pm\si@num@pm
+   \let\mp\si@num@mp}
+\newcommand*{\si@opt@proctform}[1]{%
+  \renewcommand*{\si@num@predec}{}%
+  \renewcommand*{\si@num@postdec}{}%
+  \si@switchfalse
+  \expandafter\si@ifnotmtarg\expandafter{%
+    \csname si@num@#1\endcsname}
+     {\expandafter\expandafter\expandafter\si@num@digits
+        \csname si@num@#1\endcsname\@empty\@empty}%
+   \csname si@tab@#1precnt\endcsname\z@\relax
+   \csname si@tab@#1postcnt\endcsname\z@\relax
+   \ifx\@empty\si@num@predec\@empty\else
+     \csname si@tab@#1precnt\endcsname\si@num@predec\relax
+   \fi
+   \ifx\@empty\si@num@postdec\@empty\else
+     \csname si@tab@#1postcnt\endcsname\si@num@postdec\relax
+   \fi}
+\si@opt@choicekey{tabtextalign}{left,right,centre,center}
+  {\let\si@tab@rfill@t\hfill
+   \let\si@tab@lfill@t\hfill
+   \renewcommand*{\si@tempb}{right}%
+   \ifx\si@tempa\si@tempb
+     \let\si@tab@rfill@t\relax
+   \fi
+   \renewcommand*{\si@tempb}{left}%
+   \ifx\si@tempa\si@tempb
+     \let\si@tab@lfill@t\relax
+   \fi}
+\si@opt@choicekey{tabunitalign}{left,right,centre,center}
+  {\let\si@tab@rfill@s\hfill
+   \let\si@tab@lfill@s\hfill
+   \renewcommand*{\si@tempb}{right}%
+   \ifx\si@tempa\si@tempb
+     \let\si@tab@rfill@s\relax
+   \fi
+   \renewcommand*{\si@tempb}{left}%
+   \ifx\si@tempa\si@tempb
+     \let\si@tab@lfill@s\relax
+   \fi}
+\si@opt@boolkey{fixdp}
+\newcount\si@num@dp
+\si@opt@key{dp}{%
+  \si@str@ifonlychrs{#1}{0123456789}
+    {}
+    {\si@log@err{Invalid input for dp option}
+      {The dp option must be given a positive integer}}%
+  \si@num@dp#1\relax
+  \si@fixdptrue}
+\si@opt@boolkey{tabautofit}
+\si@opt@boolkey{xspace}
+\si@opt@boolkey
+  [\si@unt@numfalse
+   \ifsi@prespace
+     \si@unt@numtrue
+  \fi]
+  {prespace}
+\si@opt@boolkey{allowoptarg}
+\newif\ifsi@slash
+\newif\ifsi@frac
+\si@opt@boolkey{stickyper}
+\si@opt@choicekey[reciprocal]{per}
+  {reciprocal,rp,power,slash,frac,fraction}
+  {\si@slashfalse
+   \si@fracfalse
+   \renewcommand*{\si@tempb}{slash}%
+   \ifx\si@tempa\si@tempb
+     \si@fractrue
+     \si@slashtrue
+     \let\si@frac\si@frc@slash
+   \fi
+   \renewcommand*{\si@tempb}{frac}%
+   \ifx\si@tempa\si@tempb
+     \si@fractrue
+   \fi
+   \renewcommand*{\si@tempb}{fraction}%
+   \ifx\si@tempa\si@tempb
+     \si@fractrue
+   \fi}
+\si@opt@xchoicekey{slash}{slash}{slash}
+\newif\ifsi@repeatunits
+\newif\ifsi@addunitpower
+\si@opt@choicekey[true]{repeatunits}{true,false,power}
+  {\si@repeatunitsfalse
+   \si@addunitpowerfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@repeatunitstrue
+   \fi
+   \renewcommand*{\si@tempb}{power}%
+   \ifx\si@tempa\si@tempb
+     \si@addunitpowertrue
+   \fi}
+\si@opt@boolkey{trapambigfrac}
+\si@opt@cmdkeys{closefrac,openfrac}
+\si@opt@choicekey[frac]{fraction}
+  {frac,nicefrac,nice,sfrac,xfrac,uglyfrac,ugly}
+  {\let\si@frac\si@frc@frac
+   \renewcommand*{\si@tempb}{nicefrac}%
+   \ifx\si@tempa\si@tempb
+     \let\si@frac\si@frc@nice
+   \fi
+   \renewcommand*{\si@tempb}{uglyfrac}%
+   \ifx\si@tempa\si@tempb
+     \let\si@frac\si@frc@ugly
+   \fi
+   \renewcommand*{\si@tempb}{nice}%
+   \ifx\si@tempa\si@tempb
+     \let\si@frac\si@frc@nice
+   \fi
+   \renewcommand*{\si@tempb}{sfrac}%
+   \ifx\si@tempa\si@tempb
+     \let\si@frac\si@frc@sfrac
+   \fi
+   \renewcommand*{\si@tempb}{xfrac}%
+   \ifx\si@tempa\si@tempb
+     \let\si@frac\si@frc@sfrac
+   \fi
+   \renewcommand*{\si@tempb}{ugly}%
+   \ifx\si@tempa\si@tempb
+     \let\si@frac\si@frc@ugly
+   \fi}
+\si@opt@cmdkeys{load,noload}
+\si@opt@key{alsoload}{\si@addtolist{\si@load}{#1}}
+\AtEndOfPackage{
+  \si@opt@disablekey{load}
+    {Configuration files can only be used\MessageBreak
+     when loading package}
+  \si@opt@disablekey{noload}
+    {Configuration files can only be used\MessageBreak
+     when loading package}}
+\AtEndOfPackage{
+  \si@opt@key{alsoload}{%
+    \@for\si@tempa:=#1\do{\si@loadfile{\si@tempa}}}}
+\si@opt@boolkey{colourunits}
+\si@opt@boolkey{colourvalues}
+\si@opt@choicekey[true]{colorunits}
+  {true,false}
+  {\si@colourunitsfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@colourunitstrue
+   \fi}
+\si@opt@choicekey[true]{colorvalues}
+  {true,false}
+  {\si@colourvaluesfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@colourvaluestrue
+   \fi}
+\si@opt@choicekey[true]{colorall}
+  {true,false}
+  {\si@colourvaluesfalse
+   \si@colourunitsfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@colourunitstrue
+     \si@colourvaluestrue
+   \fi}
+\si@opt@choicekey[true]{colourall}
+  {true,false}
+  {\si@colourvaluesfalse
+   \si@colourunitsfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@colourunitstrue
+     \si@colourvaluestrue
+   \fi}
+\si@opt@cmdkeys{unitcolour,valuecolour}
+\si@opt@key{unitcolor}{\sisetup{unitcolour=#1}}
+\si@opt@key{valuecolor}{\sisetup{valuecolour=#1}}
+\si@opt@key{colour}{\sisetup{unitcolour=#1,valuecolour=#1}}
+\si@opt@key{color}{\sisetup{unitcolour=#1,valuecolour=#1}}
+\si@opt@boolkey{colourneg}
+\si@opt@choicekey[true]{colorneg}
+  {true,false}
+  {\si@colournegfalse
+   \renewcommand*{\si@tempb}{true}%
+   \ifx\si@tempa\si@tempb
+     \si@colournegtrue
+   \fi}
+\si@opt@cmdkeys{negcolour}
+\si@opt@key{negcolor}{\sisetup{negcolour=#1}}
+\si@opt@cmdkeys{textOmega,mathsOmega}
+\si@opt@key{mathOmega}{\sisetup{mathsOmega=#1}}
+\newcommand*{\si@mathsOmega}{\text{\ensuremath{\Omega}}}
+\newcommand*{\si@textOmega}{\ensuremath{\Omega}}
+\si@opt@cmdkeys{textmu,mathsmu}
+\si@opt@key{mathmu}{\sisetup{mathsmu=#1}}
+\DeclareFontEncoding{TS1}{}{}
+\DeclareFontSubstitution{TS1}{cmr}{m}{n}
+\DeclareTextSymbol{\si@textmu}{TS1}{181}
+\DeclareTextSymbolDefault{\si@textmu}{TS1}
+\DeclareFontFamily{OML}{eur}{\skewchar\font127}
+\DeclareFontShape{OML}{eur}{m}{n}%
+  {<5> <6> <7> <8> <9> gen * eurm %
+    <10><10.95><12><14.4><17.28><20.74><24.88>eurm10}{}
+\DeclareSymbolFont{greek}{OML}{eur}{m}{n}
+\DeclareMathSymbol{\si@mathsmu}{\mathord}{greek}{"16}
+\si@opt@cmdkeys{textdegree,mathsdegree,textminute,mathsminute,
+  textsecond,mathssecond}
+\si@opt@key{mathdegree}{\sisetup{mathsdegree=#1}}
+\si@opt@key{mathminute}{\sisetup{mathsminute=#1}}
+\si@opt@key{mathsecond}{\sisetup{mathssecond=#1}}
+\newcommand*{\si@textdegree}{\ensuremath{{}^{\circ}}}
+\newcommand*{\si@mathsdegree}{{}^{\circ}}
+\newcommand*{\si@textminute}{\ensuremath{{}^{\prime}}}
+\newcommand*{\si@mathsminute}{{}^{\prime}}
+\newcommand*{\si@textsecond}{\ensuremath{{}^{\prime\prime}}}
+\newcommand*{\si@mathssecond}{{}^{\prime\prime}}
+\si@opt@cmdkeys{textcelsius,mathscelsius}
+\si@opt@key{mathcelsius}{\sisetup{mathscelsius=#1}}
+\newcommand*{\si@textcelsius}{%
+  \si@textdegree\kern-\scriptspace C}
+\newcommand*{\si@mathscelsius}{%
+  \si@mathsdegree\kern-\scriptspace\mathrm{C}}
+\si@opt@cmdkeys{textringA,mathsringA}
+\si@opt@key{mathringA}{\sisetup{mathsringA=#1}}
+\newcommand*{\si@textringA}{\AA}
+\newcommand*{\si@mathsringA}{\text{\AA}}
+\si@opt@boolkey{redefsymbols}
+\AtBeginDocument{
+  \si@opt@disablekey{redefsymbols}
+    {Symbols can only be redefined\MessageBreak
+     when loading siunitx}}
+\newlength\si@eVcorra
+\newlength\si@eVcorrb
+\si@opt@key{eVcorra}{\setlength\si@eVcorra{#1}}
+\si@opt@key{eVcorrb}{\setlength\si@eVcorrb{#1}}
+\si@opt@key{locale}{%
+  \si@loc@load{#1}%
+  \si@loc@set{#1}}%
+\si@opt@key{loctolang}{\si@loc@ltol{#1}}
+\si@opt@compatkey{units}{ugly}
+\si@opt@compatkey{units}{nice}
+\si@opt@compatkey{units}{loose}
+\si@opt@compatkey{units}{tight}
+\si@opt@compatkey{unitsdef}{OHM}
+\si@opt@compatkey{unitsdef}{ohm}
+\si@opt@compatkey{unitsdef}{redef-gensymb}
+\newif\ifsi@gensymb
+\si@opt@compatkey{unitsdef}{LITER}
+\si@opt@compatkey{unitsdef}{liter}
+\si@opt@compatkey{unitsdef}{noxspace}
+\si@opt@compatkey{unitsdef}{noconfig}
+\si@opt@compatkey{unitsdef}{noabbr}
+\si@opt@compatkey{unitsdef}{noampereageabbr}
+\si@opt@compatkey{unitsdef}{nofrequncyabbr}
+\si@opt@compatkey{unitsdef}{nomolabbr}
+\si@opt@compatkey{unitsdef}{novoltageabbr}
+\si@opt@compatkey{unitsdef}{novolumeabbr}
+\si@opt@compatkey{unitsdef}{noweightabbr}
+\si@opt@compatkey{unitsdef}{noenergyabbr}
+\si@opt@compatkey{unitsdef}{nolengthabbr}
+\si@opt@compatkey{unitsdef}{notimeabbr}
+\si@opt@compatkey{SIunits}{cdot}
+\si@opt@compatkey{SIunits}{thickspace}
+\si@opt@compatkey{SIunits}{mediumspace}
+\si@opt@compatkey{SIunits}{thinspace}
+\si@opt@compatkey{SIunits}{thickqspace}
+\si@opt@compatkey{SIunits}{mediumqspace}
+\si@opt@compatkey{SIunits}{thinqspace}
+\si@opt@compatkey{SIunits}{amssymb}
+\si@opt@compatkey{SIunits}{squaren}
+\si@opt@compatkey{SIunits}{pstricks}
+\si@opt@compatkey{SIunits}{Gray}
+\si@opt@compatkey{SIunits}{italian}
+\si@opt@compatkey{SIunits}{textstyle}
+\si@opt@compatkey{SIunits}{binary}
+\si@opt@compatkey{SIunits}{noams}
+\si@opt@compatkey{SIunits}{derivedinbase}
+\si@opt@compatkey{SIunits}{derived}
+\si@opt@compatkey{hepunits}{noprefixcmds}
+\si@opt@compatkey{fancynum}{english}
+\si@opt@compatkey{fancynum}{french}
+\si@opt@compatkey{fancynum}{tight}
+\si@opt@compatkey{fancynum}{loose}
+\si@opt@compatkey{fancynum}{thinspaces}
+\si@opt@compatkey{fancynum}{commas}
+\si@opt@compatkey{fancynum}{plain}
+\si@opt@compatkey{fancyunits}{spaceqspace}
+\newcommand*{\si@fix@thin}{\,}
+\newcommand*{\si@fix@med}{\:}
+\newcommand*{\si@fix@medium}{\:}
+\newcommand*{\si@fix@thick}{\;}
+\newcommand*{\si@fix@space}{\text{~}}
+\newcommand*{\si@fix@cdot}{{}\cdot{}}
+\newcommand*{\si@fix@comma}{{,}}
+\newcommand*{\si@fix@stop}{{.}}
+\newcommand*{\si@fix@fullstop}{{.}}
+\newcommand*{\si@fix@period}{{.}}
+\newcommand*{\si@fix@times}{\times}
+\newcommand*{\si@fix@tighttimes}{\bgroup\times\egroup}
+\newcommand*{\si@fix@tightcdot}{\bgroup\cdot\egroup}
+\newcommand*{\si@fix@plus}{+}
+\newcommand*{\si@fix@minus}{-}
+\newcommand*{\si@fix@pm}{\pm}
+\newcommand*{\si@fix@tightpm}{\bgroup\pm\egroup}
+\newcommand*{\si@fix@mp}{\mp}
+\newcommand*{\si@fix@two}{2}
+\newcommand*{\si@fix@ten}{10}
+\newcommand*{\si@fix@slash}{/}
+\newcommand*{\si@fix@none}{}
+\newcommand*{\si@symbol}[1]{%
+  \expandafter\protected\expandafter\def
+    \csname si@sym@#1\endcsname{%
+    \ifmmode
+      \expandafter\csname si@maths#1\expandafter\endcsname
+    \else
+      \expandafter\csname si@text#1\expandafter\endcsname
+    \fi}}
+\si@symbol{Omega}
+\si@symbol{ringA}
+\si@symbol{mu}
+\si@symbol{degree}
+\si@symbol{minute}
+\si@symbol{second}
+\si@symbol{celsius}
+\AtBeginDocument{%
+  \ifsi@redefsymbols
+    \@ifpackageloaded{textcomp}
+      {\si@log@debug{Redefining symbols using textcomp}%
+       \renewcommand*{\si@textdegree}{\textdegree}%
+       \renewcommand*{\si@mathsdegree}{\text{\textdegree}}%
+       \@ifpackageloaded{mathptmx}{}
+         {\renewcommand*{\si@textmu}{\textmu}%
+          \renewcommand*{\si@textOmega}{\textohm}}%
+       \renewcommand*{\si@tempa}{OT1}%
+       \ifx\si@tempa\encodingdefault
+         \renewcommand*{\si@mathsringA}{%
+           \text{\capitalring{A}}}%
+         \renewcommand*{\si@textringA}{\capitalring{A}}
+       \fi}{}
+    \@ifpackageloaded{upgreek}
+      {\si@log@debug{Redefining symbols using upgreek}%
+       \renewcommand*{\si@mathsmu}{\upmu}%
+       \renewcommand*{\si@mathsOmega}{\Upomega}}{}
+  \fi}
+\newcommand*{\si@frc@frac}[2]{%
+  \ensuremath{\si@frc@hook\frac{%
+    \expandafter\si@unt@out\expandafter{#1}}%
+    {\expandafter\si@unt@out\expandafter{#2}}}}
+\let\si@frac\si@frc@frac
+\newcommand*{\si@frc@hook}{}
+\newcommand*{\si@frc@slash}[2]{%
+    \expandafter\si@unt@out\expandafter{#1}%
+    \si@out{\ensuremath{\si@slash}}%
+    \expandafter\si@unt@out\expandafter{#2}}
+\newcommand*{\si@frc@nice}[2]{%
+  \ensuremath{\si@frc@nicefrac{\expandafter\si@unt@out%
+    \expandafter{#1}}{\expandafter\si@unt@out\expandafter
+      {#2}}}}
+\newcommand*{\si@frc@sfrac}[2]{%
+    \sfrac{\expandafter\si@unt@out\expandafter{#1}}%
+      {\expandafter\si@unt@out\expandafter{#2}}}
+\AtBeginDocument{
+  \@ifpackageloaded{xfrac}
+    {}
+    {\si@log@inf{xfrac package unavailable\MessageBreak
+       using `fraction=sfrac' will fall back on\MessageBreak
+       nicefrac-like method}%
+     \renewcommand*{\si@frc@sfrac}[2]{%
+      \si@log@warn{xfrac package unavailable}%
+      \si@frc@nice{#1}{#2}}}}
+\newlength\si@frc@displen
+\newlength\si@frc@textlen
+\newlength\si@frc@suplen
+\newlength\si@frc@ssuplen
+\newcommand*{\si@frc@nicefrac}{%
+  \ifmmode
+    \expandafter\si@frc@mathsnf
+  \else
+    \expandafter\si@frc@textnf
+  \fi}
+\newcommand*{\si@frc@mathsnf}[2]{%
+  \begingroup
+    \settoheight{\si@frc@displen}{\ensuremath{%
+      \displaystyle{M}}}%
+    \settoheight{\si@frc@textlen}{\ensuremath{%
+      \textstyle{M}}}%
+    \settoheight{\si@frc@suplen}{\ensuremath{%
+      \scriptstyle{M}}}%
+    \settoheight{\si@frc@ssuplen}{%
+      \ensuremath{\scriptscriptstyle{M}}}%
+    \addtolength{\si@frc@displen}{-\si@frc@ssuplen}%
+    \addtolength{\si@frc@textlen}{-\si@frc@ssuplen}%
+    \addtolength{\si@frc@suplen}{-\si@frc@ssuplen}%
+    \mathchoice
+      {\raisebox{\si@frc@displen}{\ensuremath{%
+        \scriptstyle{#1}}}}%
+      {\raisebox{\si@frc@textlen}{\ensuremath{%
+         \scriptstyle{#1}}}}%
+      {\raisebox{\si@frc@suplen}%
+        {\ensuremath{\scriptscriptstyle{#1}}}}%
+      {\raisebox{\si@frc@ssuplen}%
+        {\ensuremath{\scriptscriptstyle{#1}}}}%
+    \mkern-2mu\relax/\mkern-1mu\relax
+    \bgroup
+      \mathchoice
+        {\scriptstyle}%
+        {\scriptstyle}%
+        {\scriptscriptstyle}%
+        {\scriptscriptstyle}%
+      {#2}%
+    \egroup
+  \endgroup}
+\newcommand*{\si@frc@textnf}[2]{%
+  \begingroup
+    \settoheight{\si@frc@textlen}{M}%
+    \settoheight{\si@frc@ssuplen}{\fontsize\sf@size\z@\relax
+      \selectfont{M}}%
+    \addtolength{\si@frc@textlen}{-\si@frc@ssuplen}%
+    \raisebox{\si@frc@textlen}{\fontsize\sf@size\z@\relax
+      \selectfont{#1}}%
+    \hspace{-0.25ex}/\hspace{-0.25ex}%
+    \hbox{\fontsize\sf@size\z@\selectfont{#2}}%
+  \endgroup}
+\newcommand*{\si@frc@ugly}[1]{%
+  \renewcommand*{\si@tempa}{#1}%
+  \ifmmode
+    \expandafter\si@frc@frac
+  \else
+    \renewcommand*{\si@tempb}{1}%
+    \ifx\si@tempa\si@tempb
+      \setbox\si@tempboxa=\hbox{\ensuremath{\si@valuesep}}%
+      \hskip-\wd\si@tempboxa\relax
+      \renewcommand*{\si@tempa}{}%
+    \fi
+    \expandafter\si@frc@slash
+  \fi
+  {\si@tempa}}
+\g@addto@macro{\document}{%
+  \ifdefined\mathsf
+    \setbox\si@tempboxa=\hbox{%
+      $\mathsf{\global\chardef\si@fam@sf=\fam}$}%
+  \else
+    \si@log@inf{\string\mathsf not found}%
+    \global\chardef\si@fam@sf=99\relax
+  \fi
+  \ifdefined\mathtt
+    \setbox\si@tempboxa=\hbox{%
+      $\mathtt{\global\chardef\si@fam@tt=\fam}$}%
+  \else
+    \si@log@inf{\string\mathtt not found}%
+    \global\chardef\si@fam@tt=99\relax
+  \fi}
+\newcommand*{\si@fam@ifbtext}[1]{%
+  \if b\expandafter\@car\f@series\@nil
+    #1\fi}
+\newcommand*{\si@fam@ifbmaths}[1]{%
+  \renewcommand*{\si@tempa}{bold}%
+  \ifx\math@version\si@tempa
+    #1\fi}
+\newcommand*{\si@fam@ifbinline}{%
+  \ifsi@inlinebtext
+    \expandafter\si@fam@ifbtext
+  \else
+    \expandafter\si@fam@ifbmaths
+  \fi}
+\newcommand*{\si@fam@ifitext}[1]{%
+  \if n\expandafter\@car\f@series\@nil\else
+    #1\fi}
+\newcommand*{\si@fam@mode}{%
+  \ifsi@obeymode
+    \ifmmode
+      \sisetup{mode=maths}%
+    \else
+      \sisetup{mode=text}%
+    \fi
+  \fi}
+\AtBeginDocument{
+  \@ifpackageloaded{color}
+    {\let\si@fam@colourcmd\color}
+    {\let\si@fam@colourcmd\@gobble}}
+\newif\ifsi@fam@set
+\newif\ifsi@textmode
+\newcommand*{\si@fam@set}{%
+  \ifsi@out@num
+    \ifsi@numtextmode
+      \expandafter\expandafter\expandafter\si@textmodetrue
+    \else
+      \expandafter\expandafter\expandafter\si@textmodefalse
+    \fi
+  \else
+    \ifsi@unittextmode
+      \expandafter\expandafter\expandafter\si@textmodetrue
+    \else
+      \expandafter\expandafter\expandafter\si@textmodefalse
+    \fi
+  \fi
+  \ifsi@fam@set\else
+    \let\si@colourcmd\@gobble
+    \ifsi@out@num
+      \let\si@mathsrm\si@valuemathsrm
+      \let\si@mathssf\si@valuemathssf
+      \let\si@mathstt\si@valuemathstt
+      \let\si@textrm\si@valuetextrm
+      \let\si@textsf\si@valuetextsf
+      \let\si@texttt\si@valuetexttt
+      \ifsi@colourvalues
+        \let\si@colourcmd\si@fam@colourcmd
+      \fi
+      \let\si@colour\si@valuecolour
+    \else
+      \let\si@mathsrm\si@unitmathsrm
+      \let\si@mathssf\si@unitmathssf
+      \let\si@mathstt\si@unitmathstt
+      \let\si@textrm\si@unittextrm
+      \let\si@textsf\si@unittextsf
+      \let\si@texttt\si@unittexttt
+      \ifsi@colourunits
+        \let\si@colourcmd\si@fam@colourcmd
+      \fi
+      \let\si@colour\si@unitcolour
+    \fi
+  \fi
+  \si@fam@settrue
+  \edef\si@tempa{\sfdefault}%
+  \edef\si@tempb{\ttdefault}%
+  \expandafter\let\expandafter\si@fam@maths
+    \csname\si@mathsrm\endcsname
+  \expandafter\let\expandafter\si@fam@text
+    \csname\si@textrm\endcsname
+  \ifsi@obeyfamily
+    \si@log@debug{Font detection: checking font}%
+    \ifmmode
+      \ifinner
+        \si@log@debug{Font detection: inline maths}%
+        \si@fam@dettext
+      \else
+        \si@log@debug{Font detection: display maths}%
+        \ifsi@detectdisplay
+          \si@fam@detmaths
+        \else
+          \si@fam@dettext
+        \fi
+      \fi
+    \else
+      \si@log@debug{Font detection: text}%
+      \si@fam@dettext
+    \fi
+  \else
+    \si@log@debug{Font detection: inactive}%
+  \fi
+  \def\si@fam@bold{\unboldmath\mdseries}%
+  \ifsi@obeybold
+    \si@log@debug{Weight detection: checking weight}%
+    \ifmmode
+      \ifdim\displaywidth>0pt\relax
+        \ifsi@detectdisplay
+          \expandafter\si@fam@ifbmaths
+        \else
+          \expandafter\si@fam@ifbtext
+        \fi
+        \si@fam@setbold
+      \else
+        \si@fam@ifbinline\si@fam@setbold
+      \fi
+    \else
+      \si@fam@ifbtext\si@fam@setbold
+    \fi
+  \fi
+  \let\si@fam@italic\upshape
+  \ifsi@obeyitalic
+    \si@log@debug{Italic detection: checking italic}%
+    \si@fam@ifitext
+      {\let\si@fam@italic\relax
+       \si@log@debug{Italic detection: italic}}%
+  \fi}
+\newcommand*{\si@fam@detmaths}{%
+  \ifnum\the\fam=\si@fam@sf
+    \si@log@debug{Font detection: sf}%
+    \expandafter\let\expandafter\si@fam@maths
+      \csname\si@mathssf\endcsname
+    \expandafter\let\expandafter\si@fam@text
+      \csname\si@textsf\endcsname
+  \else
+    \ifnum\the\fam=\si@fam@tt
+      \si@log@debug{Font detection: tt}%
+      \expandafter\let\expandafter\si@fam@maths
+        \csname\si@mathstt\endcsname
+      \expandafter\let\expandafter\si@fam@text
+        \csname\si@texttt\endcsname
+    \else
+      \si@log@debug{Font detection: rm}%
+      \expandafter\let\expandafter\si@fam@maths
+        \csname\si@mathsrm\endcsname
+      \expandafter\let\expandafter\si@fam@text
+        \csname\si@textrm\endcsname
+    \fi
+  \fi}
+\newcommand*{\si@fam@dettext}{%
+  \ifx\f@family\si@tempa
+    \si@log@debug{Font detection: sf}%
+    \expandafter\let\expandafter\si@fam@maths
+      \csname\si@mathssf\endcsname
+    \expandafter\let\expandafter\si@fam@text
+      \csname\si@textsf\endcsname
+  \else
+    \ifx\f@family\si@tempb
+      \si@log@debug{Font detection: tt}%
+      \expandafter\let\expandafter\si@fam@maths
+        \csname\si@mathstt\endcsname
+      \expandafter\let\expandafter\si@fam@text
+        \csname\si@texttt\endcsname
+    \else
+      \si@log@debug{Font detection: rm}%
+      \expandafter\let\expandafter\si@fam@maths
+        \csname\si@mathsrm\endcsname
+      \expandafter\let\expandafter\si@fam@text
+        \csname\si@textrm\endcsname
+    \fi
+  \fi}
+\newcommand*{\si@fam@setbold}{%
+  \si@log@debug{Weight detection: bold weight}%
+  \let\si@fam@bold\si@fam@boldify}
+\newcommand*{\si@fam@boldify}{\boldmath\bfseries}
+\si@newrobustcmd*{\num}[2][]{%
+  \begingroup
+    \sisetup{#1}%
+    \si@fam@mode
+    \si@num@intabfalse
+    \si@log@debug{Processing \string\num\space input `#2'}%
+    \expandafter\si@out@num\expandafter{\si@num{#2}}%
+  \endgroup}
+\newif\ifsi@num@intab
+\newcommand*{\si@num}[1]{%
+  \si@num@fixpm
+  \begingroup
+    \makeatletter
+    \@makeother{\,}%
+    \@makeother{\.}%
+    \@makeother{\+}%
+    \@makeother{\-}%
+    \def~{}%
+    \def\,{}%
+    \catcode`\~=\active\relax
+    \catcode`\^=\active\relax
+    \everyeof{\noexpand}%
+    \endlinechar\m@ne
+    \protected@xdef\si@tempa{\scantokens{#1}}%
+  \endgroup
+  \si@ifnotmtarg{\si@tempa}
+    {\si@num@ifvalid{\si@tempa}
+      {\si@num@format{\si@tempa}}
+      {\si@log@err{Invalid character `#1' in numerical input}%
+         {Only characters from the list
+          `\si@numvalid'\MessageBreak should be present in the
+          argument of the \string\num\space  macro\MessageBreak
+         (or derivative such as an `s' column)}%
+       {#1}}}}
+\newcommand*{\si@num@fixpm}{%
+  \let\si@num@pm\pm
+  \let\si@num@mp\mp
+  \protected\def\pm{\si@num@pm}%
+  \protected\def\mp{\si@num@mp}}
+\newcommand*{\si@num@ifvalid}[1]{%
+  \begingroup
+    \si@switchtrue
+    \expandafter\si@num@valid#1\@empty\@empty
+    \ifsi@switch
+      \aftergroup\@firstoftwo
+    \else
+      \aftergroup\@secondoftwo
+    \fi
+  \endgroup}
+\def\si@num@valid#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@numvalid}
+    {\ifx\@empty#2\@empty\else
+       \si@num@valid#2\@empty\@empty\@empty
+     \fi}
+    {\si@switchfalse}}
+\newcommand*{\si@num@in}{}
+\newcommand*{\si@num@out}{}
+\newcommand*{\si@num@exp}{}
+\newcommand*{\si@num@expsign}{}
+\newcommand*{\si@num@mant}{}
+\newcommand*{\si@num@mantsign}{}
+\newcommand*{\si@num@err}{}
+\newcommand*{\si@num@xpart}{}
+\newcommand*{\si@num@ambig}{}
+\newcommand*{\si@tab@out}{}
+\newcommand*{\si@tab@expout}{}
+\newif\ifsi@num@erropen
+\newcommand*{\si@num@arg}{}
+\newcommand*{\si@num@format}[1]{%
+  \protected@edef\si@num@arg{#1}%
+  \si@log@debug{Formatting number `\si@num@arg'}%
+  \renewcommand*{\si@num@in}{}%
+  \renewcommand*{\si@num@exp}{}%
+  \renewcommand*{\si@num@expsign}{}%
+  \renewcommand*{\si@num@mant}{}%
+  \renewcommand*{\si@num@mantsign}{}%
+  \renewcommand*{\si@num@err}{}%
+  \renewcommand*{\si@num@xpart}{}%
+  \si@switchfalse
+  \expandafter\si@num@findxpart\si@num@arg\@empty\@empty
+  \si@switchfalse
+  \si@num@sepmantexp{\si@num@in}%
+  \si@num@sepsign{exp}%
+  \si@num@sepsign{mant}%
+  \ifx\@empty\si@num@exp\@empty
+    \ifx\@empty\si@num@expsign\@empty\else
+      \si@log@warn{Sign but no number for `\si@num@arg'}%
+    \fi
+    \let\si@num@expsign\@empty
+  \fi
+  \ifx\@empty\si@num@mant\@empty
+    \ifx\@empty\si@num@mantsign\@empty\else
+      \ifx\@empty\si@num@exp\@empty
+        \si@log@warn{Sign but no number for `\si@num@arg'}%
+        \let\si@num@mantsign\@empty
+      \fi
+    \fi
+  \fi
+  \renewcommand*{\si@tempa}{{-}}%
+  \ifx\si@num@mantsign\si@tempa
+    \ifsi@colourneg
+      \expandafter\expandafter\expandafter\si@fam@colourcmd
+    \else
+      \expandafter\expandafter\expandafter\@gobble
+    \fi
+  \else
+    \expandafter\@gobble
+  \fi
+  {\si@negcolour}%
+  \si@num@procnum{exp}%
+  \si@num@procnum{mant}%
+  \si@str@ifonlychrs{\si@num@exp}{0\si@numdecimal}
+    {\ifsi@allowzeroexp\else
+       \renewcommand*{\si@num@exp}{}%
+       \ifx\@empty\si@num@mant\@empty
+         \renewcommand*{\si@num@mant}{1}%
+       \fi
+     \fi}{}%
+  \ifx\@empty\si@num@exp\@empty\else
+    \ifsi@trapambigerr
+      \expandafter\expandafter\expandafter\si@num@ambigerrtrue
+    \fi
+  \fi
+  \protected@edef\si@num@out{%
+    \ensuremath{{\si@num@mantsign}}\si@num@mant}%
+  \renewcommand*{\si@tempa}{num}%
+  \ifsi@num@intab
+    \protected@edef\si@tab@out{%
+      \ensuremath{{\si@num@mantsign}}\si@num@predec}%
+    \protected@edef\si@num@out{\si@num@postdec}%
+    \renewcommand*{\si@tempa}{tab}%
+  \fi
+  \ifx\@empty\si@num@postdec\@empty\else
+    \renewcommand*{\si@tempa}{num}%
+  \fi
+  \ifx\@empty\si@num@err\@empty\else
+    \ifsi@seperr
+      \ifsi@num@ambigerr
+        \protected@edef\si@num@out{%
+          \ensuremath{\si@openerr}\si@num@out}%
+        \si@repeatunitsfalse
+        \expandafter\si@num@erropentrue
+      \else
+        \ifsi@trapambigerr\else
+          \ifx\@empty\si@num@exp\@empty\else
+            \protected@edef\si@num@err{%
+              \si@num@err\expandafter\@car\si@numexp\@nil
+              \si@num@expsign\si@num@exp}%
+            \ifsi@repeatunits\else
+              \renewcommand*{\si@num@exp}{}%
+              \renewcommand*{\si@num@expsign}{}%
+            \fi
+          \fi
+        \fi
+      \fi
+    \else
+      \expandafter\protected@edef\csname
+        si@\si@tempa @out\endcsname{%
+          \si@num@out\ensuremath{\si@errspace}\ensuremath
+          {\si@openerr}\si@num@err\ensuremath{\si@closeerr}}%
+      \renewcommand*{\si@num@err}{}%
+    \fi
+  \fi
+  \renewcommand*{\si@tempa}{num@out}%
+  \ifsi@num@erropen
+    \renewcommand*{\si@tempa}{num@ambig}%
+  \fi
+  \ifsi@num@intab
+    \renewcommand*{\si@tempa}{tab@expout}%
+  \fi
+  \ifx\@empty\si@num@exp\@empty
+    \ifx\@empty\si@num@mant\@empty
+      \si@log@err{Invalid number format `\si@num@arg'}
+        {Something is wrong with the number format; does it
+         contain \MessageBreak any numbers (from the list
+         `\si@numdigits')?}%
+      \renewcommand*\si@num@out{}%
+    \fi
+  \else
+    \ifx\@empty\si@num@mant\@empty\else
+      \expandafter\protected@edef\csname
+        si@\si@tempa\endcsname{%
+          \csname si@\si@tempa\endcsname\ensuremath{{}%
+          \si@expproduct{}}}%
+    \fi
+    \expandafter\protected@edef\csname
+      si@\si@tempa\endcsname{%
+        \csname si@\si@tempa\endcsname\si@expbase
+        \textsuperscript{\ensuremath{\si@num@expsign}%
+        \si@num@exp}}%
+  \fi
+  \ifsi@num@intab\else
+    \expandafter\si@num@out
+  \fi
+  \ifx\@empty\si@num@err\@empty\else
+    \expandafter\si@num@procerr
+  \fi
+  \ifsi@num@erropen
+    \expandafter\si@out@num\expandafter{%
+      \ensuremath{\si@closeerr}}%
+      \ifx\@empty\si@num@ambig\@empty\else
+        \expandafter\si@out@num\expandafter{\si@num@ambig}%
+        \renewcommand*{\si@num@ambig}{}%
+    \fi
+  \fi
+  \si@num@erropenfalse
+  \ifx\@empty\si@num@xpart\@empty\else
+    \expandafter\si@num@sepxpart
+  \fi}
+\def\si@num@findxpart#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@numprod}
+    {\si@switchtrue\si@seperrfalse}{}%
+  \ifsi@switch
+    \protected@edef\si@num@xpart{\si@num@xpart#1}%
+  \else
+    \protected@edef\si@num@in{\si@num@in#1}%
+  \fi
+  \ifx\@empty#2\@empty\else
+    \si@num@findxpart#2\@empty
+  \fi}
+\newcommand*{\si@num@sepmantexp}[1]{%
+  \expandafter\si@num@mantexp#1\@empty\@empty}
+\def\si@num@mantexp#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@numgobble}
+    {\si@log@debug{Gobbling `#1' in \si@num@arg}}
+    {\si@str@ifchrstr{#1}{\si@numexp}
+       {\ifsi@switch
+          \si@log@err{Duplicate exponent marker found}
+            {Only a single exponent character \MessageBreak
+            (from the list `\si@numexp')\MessageBreak may
+            occur in a numerical argument}%
+        \else
+          \si@log@debug{Exponent marker `#1' found in
+            `\si@num@arg'}%
+        \fi
+        \si@switchtrue}%
+       {\ifsi@switch
+          \expandafter\si@num@addexp
+        \else
+          \expandafter\si@num@addmnt
+        \fi
+        {#1}}}%
+  \ifx\@empty#2\@empty
+    \expandafter\@gobble
+  \else
+    \expandafter\si@num@sepmantexp
+  \fi
+  {#2}}
+\newcommand*{\si@num@addmnt}[1]{%
+  \si@num@addmntexp{#1}{mant}{mantissa}}
+\newcommand*{\si@num@addexp}[1]{%
+  \si@num@addmntexp{#1}{exp}{exponent}}
+\newcommand*{\si@num@addmntexp}[3]{%
+  \si@log@debug{Adding `#1' to #3 for `\si@num@arg'}%
+  \expandafter\protected@edef\csname si@num@#2\endcsname{%
+    \csname si@num@#2\endcsname#1}}
+\newcommand*{\si@num@sepsign}[1]{%
+  \expandafter\ifx\expandafter\@empty
+    \csname si@num@#1\endcsname\@empty
+    \expandafter\@gobble
+  \else
+    \expandafter\si@num@gensign
+  \fi
+  {#1}}
+\newcommand*{\si@num@gensign}[1]{%
+  \expandafter\expandafter\expandafter\si@num@findsign
+    \csname si@num@#1\endcsname\@empty\@empty
+  \ifx\@empty\si@num@sign\@empty
+    \ifx\@empty\si@num@value\@empty
+      \expandafter\expandafter\expandafter\@gobble
+    \else
+      \expandafter\expandafter\expandafter\si@num@addsign
+    \fi
+  \else
+    \expandafter\@gobble
+  \fi
+  {#1}%
+  \expandafter\let\csname si@num@#1sign\endcsname\si@num@sign
+  \expandafter\let\csname si@num@#1\endcsname\si@num@value}
+\newcommand*{\si@num@sign}{}
+\def\si@num@findsign#1#2#3\@empty{%
+  \si@num@delplusfalse
+  \si@str@ifchrstr{#1}{\si@numsign}{%
+    \si@str@ifchrstr{#2}{\si@numsign}{%
+      \if +#1%
+        \if -#2%
+          \si@log@debug{Found sign combination +- for
+            `\si@num@arg'}%
+          \renewcommand*{\si@num@sign}{{\si@pm}}%
+        \else
+          \si@log@inf{Unknown sign combination `#1#2'}%
+          \renewcommand*{\si@num@sign}{{#1#2}}%
+        \fi
+      \else
+        \if -#1%
+          \if +#2%
+            \si@log@debug{Found sign combination -+ for
+              `\si@num@arg'}%
+            \renewcommand*{\si@num@sign}{{\mp}}%
+          \else
+            \si@log@inf{Unknown sign combination `#1#2'}%
+            \renewcommand*{\si@num@sign}{{#1#2}}%
+          \fi
+        \else
+          \si@log@inf{Unknown sign combination `#1#2'}%
+          \renewcommand*{\si@num@sign}{{#1#2}}%
+        \fi
+      \fi
+      \protected@edef\si@num@value{#3}}%
+      {\si@log@debug{Found single sign character `#1' for
+         `\si@num@arg'}%
+       \renewcommand*{\si@num@sign}{{#1}}%
+       \if +#1%
+         \ifsi@retainplus\else
+           \expandafter\expandafter\expandafter\si@num@killsign
+         \fi
+       \fi
+       \protected@edef\si@num@value{#2#3}}}%
+    {\si@log@debug{No sign found for `\si@num@arg'}%
+     \renewcommand*{\si@num@sign}{}%
+     \protected@edef\si@num@value{#1#2#3}}}
+\newif\ifsi@num@delplus
+\newcommand*{\si@num@killsign}{%
+  \si@num@delplustrue
+  \renewcommand*{\si@num@sign}{}}
+\newcommand*{\si@num@addsign}[1]{%
+  \begingroup
+    \renewcommand*{\si@tempa}{#1}%
+    \renewcommand*{\si@tempb}{mant}%
+    \ifx\si@tempa\si@tempb
+      \aftergroup\@firstoftwo
+    \else
+      \aftergroup\@secondoftwo
+    \fi
+  \endgroup
+  {\ifsi@num@signmant
+     \expandafter\si@num@asign
+   \else
+     \expandafter\@gobble
+   \fi
+   {mantissa}}
+  {\ifsi@num@signexp
+     \expandafter\si@num@asign
+   \else
+     \expandafter\@gobble
+   \fi
+   {exponent}}}
+\newcommand*{\si@num@asign}[1]{%
+  \let\si@num@sign\si@sign
+  \si@log@debug{Adding sign \si@sign\space to #1 for
+    `\si@num@arg'}}
+\newcommand*{\si@num@procnum}[1]{%
+  \expandafter\ifx\expandafter\@empty
+    \csname si@num@#1\endcsname\@empty
+    \expandafter\@gobble
+  \else
+    \expandafter\si@num@finddigits
+  \fi
+  {#1}}
+\newcommand*{\si@num@predec}{}
+\newcommand*{\si@num@postdec}{}
+\newcommand*{\si@num@finddigits}[1]{%
+  \renewcommand*{\si@num@predec}{}%
+  \renewcommand*{\si@num@postdec}{}%
+  \si@switchfalse
+  \expandafter\expandafter\expandafter\si@num@digits
+    \csname si@num@#1\endcsname\@empty\@empty
+  \ifx\@empty\si@num@predec\@empty
+    \ifsi@num@padlead
+      \expandafter\expandafter\expandafter\si@num@addprezero
+    \fi
+  \fi
+  \ifx\@empty\si@num@postdec\@empty
+    \ifsi@num@padtrail
+      \ifsi@switch
+        \expandafter\expandafter\expandafter\expandafter
+          \expandafter\expandafter\expandafter
+          \si@num@addpostzero
+      \fi
+    \fi
+  \fi
+  \si@num@unsign{#1}%
+  \ifx\@empty\si@num@predec\@empty
+  \else
+    \expandafter\si@num@nozero
+  \fi
+  \ifx\@empty\si@num@predec\@empty
+    \ifx\@empty\si@num@postdec\@empty
+      \expandafter\expandafter\expandafter\@gobble
+    \else
+      \expandafter\expandafter\expandafter\si@num@sepdigits
+    \fi
+  \else
+    \expandafter\si@num@sepdigits
+  \fi
+  {#1}}
+\def\si@num@digits#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@numdecimal}
+    {\ifsi@switch
+       \si@log@err{Duplicate decimal marker in `\si@num@arg'}
+         {Only a single decimal marker (from the list
+            `\si@numdecimal')\MessageBreak may occur in a
+            numerical argument}%
+     \else
+       \si@log@debug{Found decimal marker `#1' in
+         `\si@num@arg'}%
+       \expandafter\si@switchtrue
+     \fi}
+    {\si@str@ifchrstr{#1}{\si@numsign}
+       {\si@log@err{Misplaced sign character
+          `#1' in `\si@num@arg'}
+          {Sign characters `\si@numsign' can only
+            occur\MessageBreak at the start of a number}}
+       {\ifsi@switch
+          \expandafter\si@num@post
+        \else
+          \expandafter\si@num@pre
+        \fi
+        {#1}}}%
+  \ifx\@empty#2\@empty\else
+    \si@num@digits#2\@empty\@empty
+  \fi}
+\newcommand*{\si@num@pre}[1]{%
+  \si@num@prepost{#1}{pre}{integer}}
+\newcommand*{\si@num@post}[1]{%
+  \si@num@prepost{#1}{post}{decimal}}
+\newcommand*{\si@num@prepost}[3]{%
+  \expandafter\protected@edef\csname si@num@#2dec\endcsname{%
+    \csname si@num@#2dec\endcsname#1}%
+  \si@log@debug{Adding `#1' to #3 part for `\si@num@arg'}}
+\newcommand*{\si@num@addprezero}{%
+  \si@num@addpzero{pre}{leading}}
+\newcommand*{\si@num@addpostzero}{%
+  \si@num@addpzero{post}{trailing}}
+\newcommand*{\si@num@addpzero}[2]{%
+  \si@log@debug{Adding #2 zero for `\si@num@arg'}%
+  \@namedef{si@num@#1dec}{0}}
+\newcommand*{\si@num@unsign}[1]{%
+  \expandafter\ifx\expandafter\@empty
+    \csname si@num@#1sign\endcsname\@empty
+    \expandafter\@gobble
+  \else
+    \expandafter\si@num@nosign
+  \fi
+  {#1}}
+\newcommand*{\si@num@nosign}[1]{%
+  \begingroup
+    \si@switchtrue
+    \si@str@ifonlychrs{\si@num@predec\si@num@postdec}{0}
+      {\si@switchfalse}{}%
+    \ifsi@switch
+      \aftergroup\@gobble
+    \else
+      \aftergroup\@firstofone
+    \fi
+  \endgroup
+  {\si@log@debug{Zero value: removing any sign}%
+   \ifsi@ang@sign\else
+     \@namedef{si@num@#1sign}{}%
+   \fi}}
+\newcommand*{\si@num@nozero}{%
+  \si@str@ifonlychrs{\si@num@predec}{0}
+    {\renewcommand*{\si@num@predec}{0}}{}}
+\newcommand*{\si@num@decimalhook}{}
+\newcommand*{\si@num@sepdigits}[1]{%
+  \begingroup
+    \let\si@numextra\si@numaddn
+    \protected@edef\si@tempa{\si@num@predec\si@num@postdec}%
+    \si@num@ifextra{\si@tempa}
+      {\aftergroup\@gobble}
+      {\aftergroup\@firstofone}%
+  \endgroup
+  {\renewcommand*{\si@tempb}{mant}%
+   \renewcommand*{\si@tempc}{#1}%
+   \ifx\si@tempb\si@tempc
+     \expandafter\si@num@checkerr
+   \fi}%
+  \protected@edef\si@tempa{\si@num@predec\si@num@postdec}%
+  \expandafter\si@str@ifonlychrs\expandafter{\si@tempa}
+    {0123456789}
+    {\ifx\@empty\si@num@err\@empty
+       \ifsi@fixdp
+         \expandafter\expandafter\expandafter\si@num@fixdp
+       \fi
+     \fi}{}%
+  \si@num@ifextra{\si@num@predec}{}
+    {\expandafter\si@num@int\expandafter{\si@num@predec}}%
+  \renewcommand*{\si@tempc}{}%
+  \ifx\@empty\si@num@postdec\@empty\else
+    \si@num@decimalhook
+    \renewcommand*{\si@tempc}{%
+      \ensuremath{{\si@decimalsymbol}}}%
+    \si@num@ifextra{\si@num@postdec}{}
+      {\expandafter\si@num@dec\expandafter{\si@num@postdec}}%
+  \fi
+  \expandafter\protected@edef\csname si@num@#1\endcsname
+    {\si@num@predec\si@tempc\si@num@postdec}}
+\newcommand*{\si@num@ifextra}[1]{%
+  \begingroup
+    \si@switchfalse
+    \expandafter\si@num@extra#1\@empty\@empty
+    \ifsi@switch
+      \si@log@debug{Found `extra' characters in `#1'}%
+      \aftergroup\@firstoftwo
+    \else
+      \aftergroup\@secondoftwo
+    \fi
+  \endgroup}
+\def\si@num@extra#1#2\@empty{%
+  \ifx\@empty#1\@empty\else
+    \si@str@ifchrstr{#1}{\si@numextra}{\si@switchtrue}{}%
+    \ifx\@empty#2\@empty\else
+      \si@num@extra#2\@empty\@empty
+    \fi
+  \fi}
+\newif\ifsi@num@ambigerr
+\newcommand*{\si@num@checkerr}{%
+  \ifx\@empty\si@num@postdec\@empty
+    \expandafter\si@num@preerr
+  \else
+    \expandafter\si@num@posterr
+  \fi}
+\newcommand*{\si@num@preerr}{%
+  \si@num@seperr{pre}%
+  \ifx\@empty\si@tempb\@empty\else
+    \expandafter\renewcommand\expandafter*\expandafter
+      \si@num@err\expandafter{\si@tempb}%
+  \fi}
+\newcommand*{\si@num@posterr}{%
+  \si@num@seperr{post}%
+  \ifx\@empty\si@tempb\@empty\else
+    \ifsi@seperr
+      \expandafter\expandafter\expandafter\si@num@psterr
+    \else
+      \let\si@num@err\si@tempb
+    \fi
+  \fi}
+\newcommand*{\si@num@psterr}{%
+    \si@num@cntdigits{\si@tempb}%
+    \si@tempcntb\si@tempcnta\relax
+    \si@num@cntdigits{\si@num@postdec}%
+    \ifnum\si@tempcnta<\si@tempcntb\relax
+      \expandafter\si@num@largeerr
+    \else
+      \expandafter\si@num@smallerr
+    \fi}
+\newcommand*{\si@num@seperr}[1]{%
+  \si@switchfalse
+  \renewcommand*{\si@tempa}{}%
+  \renewcommand*{\si@tempb}{}%
+  \expandafter\expandafter\expandafter\si@num@finderr
+    \csname si@num@#1dec\endcsname\@empty\@empty
+  \ifx\@empty\si@tempb\@empty\else
+    \expandafter\let\csname si@num@#1dec\endcsname\si@tempa
+  \fi}
+\def\si@num@finderr#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@numopenerr}
+    {\ifsi@switch
+       \si@log@err{Invalid error in number}
+         {The numerical argument \si@num@arg\space has two (or
+           more)\MessageBreak error-opening characters}%
+     \else
+       \expandafter\si@switchtrue
+     \fi}
+    {\si@str@ifchrstr{#1}{\si@numcloseerr}
+       {\ifsi@switch
+          \ifx\@empty#2\@empty\else
+            \si@log@err{Invalid error in number}
+              {The numerical argument \si@num@arg\space has an
+              error-closing before the last character}%
+          \fi
+        \else
+          \si@log@err{Invalid error in number}
+           {The numerical argument \si@num@arg\space has an
+              error-closing character\MessageBreak but no
+              error-opening one}%
+        \fi}
+       {\ifsi@switch
+          \expandafter\si@num@addtmpb
+        \else
+          \expandafter\si@num@addtmpa
+        \fi
+        {#1}}}%
+  \ifx\@empty#2\@empty\else
+    \si@num@finderr#2\@empty
+  \fi}
+\newcommand*{\si@num@addtmpa}[1]{\si@num@addtmp{a}{#1}}
+\newcommand*{\si@num@addtmpb}[1]{\si@num@addtmp{b}{#1}}
+\newcommand*{\si@num@addtmp}[2]{%
+  \expandafter\protected@edef\csname si@temp#1\endcsname{%
+    \csname si@temp#1\endcsname#2}}
+\newcommand*{\si@num@cntdigits}[1]{%
+  \si@tempcnta\z@\relax
+  \expandafter\si@num@cntdgt#1\@empty\@empty}
+\def\si@num@cntdgt#1#2\@empty{%
+  \ifx\@empty#1\@empty\else
+    \advance\si@tempcnta\@ne\relax
+  \fi
+  \ifx\@empty#2\@empty\else
+    \expandafter\si@num@cntdgt#2\@empty
+  \fi}
+\newcommand*{\si@num@smallerr}{%
+  \si@tempcntb\si@tempcnta\relax
+  \si@num@serr
+  \protected@edef\si@num@err{%
+    \ifsi@num@padlead0\fi\expandafter\@car\si@numdecimal\@nil
+    \si@tempb}}
+\newcommand*{\si@num@serr}{%
+  \si@num@cntdigits{\si@tempb}%
+  \ifnum\si@tempcnta=\si@tempcntb\relax\else
+    \protected@edef\si@tempb{0\si@tempb}%
+    \expandafter\si@num@serr
+  \fi}
+\newcommand*{\si@num@largeerr}{%
+  \renewcommand*{\si@tempa}{}%
+  \si@tempcntb\si@tempcnta\relax
+  \si@num@lerr
+  \protected@edef\si@num@err{%
+    \si@tempa\ensuremath{\si@decimalsymbol}\si@tempb}}
+\newcommand*{\si@num@lerr}{%
+  \si@num@cntdigits{\si@tempb}%
+  \ifnum\si@tempcnta=\si@tempcntb\relax\else
+    \expandafter\si@num@movedigit\si@tempb\@empty\@empty
+    \si@num@lerr
+  \fi}
+\def\si@num@movedigit#1#2\@empty{%
+  \protected@edef\si@tempa{\si@tempa#1}%
+  \protected@edef\si@tempb{#2}}
+\newcommand*{\si@num@fixdp}{%
+  \si@num@cntdigits{\si@num@postdec}%
+  \ifx\@empty\si@num@postdec\@empty
+    \si@tempcnta\z@\relax
+  \fi
+  \ifnum\si@tempcnta>\si@num@dp\relax
+    \expandafter\si@num@round
+  \else
+    \ifnum\si@tempcnta<\si@num@dp\relax
+      \expandafter\expandafter\expandafter\si@num@pad
+    \fi
+  \fi}
+\newcommand*{\si@num@pad}{%
+  \si@log@debug{Padding to \the\si@num@dp\space digits}%
+  \loop\ifnum\si@tempcnta<\si@num@dp\si@num@pd\repeat}
+\newcommand*{\si@num@pd}{%
+  \advance\si@tempcnta\@ne\relax
+  \protected@edef\si@num@postdec{\si@num@postdec0}}
+\newcommand*{\si@num@prernd}{}
+\newcommand*{\si@num@postrnd}{}
+\newcommand*{\si@num@round}{%
+  \si@log@debug{Rounding to \the\si@num@dp\space digits}%
+  \si@num@reverse{\si@num@postdec}%
+  \si@num@reverse{\si@num@predec}%
+  \let\si@num@prernd\si@num@predec
+  \let\si@num@postrnd\si@num@postdec
+  \renewcommand*{\si@num@predec}{}%
+  \renewcommand*{\si@num@postdec}{}%
+  \si@switchfalse
+  \si@num@rnd}
+\newcommand*{\si@num@reverse}[1]{%
+  \renewcommand*{\si@tempa}{}%
+  \expandafter\si@num@rev#1\@empty\@empty
+  \let#1\si@tempa}
+\def\si@num@rev#1#2\@empty{%
+  \edef\si@tempa{#1\si@tempa}%
+  \ifx\@empty#2\@empty\else
+    \si@num@rev#2\@empty\@empty
+  \fi}
+\newcommand*{\si@num@rnd}{%
+  \ifnum\si@tempcnta>\z@\relax
+    \expandafter\si@num@rndpost
+  \else
+    \expandafter\si@num@rndpre
+  \fi}
+\newcommand*{\si@num@rndpre}{%
+  \expandafter\edef\expandafter\si@tempa\expandafter{%
+    \expandafter\@car\si@num@prernd\@nil}%
+  \expandafter\edef\expandafter\si@num@prernd\expandafter{%
+    \expandafter\@cdr\si@num@prernd\@nil}%
+  \si@tempcntb\si@tempa\relax
+  \ifsi@switch
+    \advance\si@tempcntb\@ne\relax
+  \fi
+  \si@switchfalse
+  \ifnum\si@tempcntb=10\relax
+    \si@tempcntb\z@\relax
+    \expandafter\expandafter\expandafter\si@switchtrue
+  \fi
+  \edef\si@num@predec{\the\si@tempcntb\si@num@predec}%
+  \ifx\@empty\si@num@prernd\@empty
+    \ifsi@switch
+      \edef\si@num@predec{1\si@num@predec}%
+    \fi
+  \else
+    \expandafter\si@num@rnd
+  \fi}
+\newcommand*{\si@num@rndpost}{%
+  \expandafter\edef\expandafter\si@tempa\expandafter{%
+    \expandafter\@car\si@num@postrnd\@nil}%
+  \expandafter\edef\expandafter\si@num@postrnd\expandafter{%
+    \expandafter\@cdr\si@num@postrnd\@nil}%
+  \si@tempcntb\si@tempa\relax
+  \ifsi@switch
+    \advance\si@tempcntb\@ne\relax
+  \fi
+  \si@switchfalse
+  \ifnum\si@tempcnta>\si@num@dp\relax
+    \ifnum\si@tempcntb>4\relax
+      \expandafter\expandafter\expandafter\si@switchtrue
+    \fi
+  \else
+    \ifnum\si@tempcntb=10\relax
+      \si@tempcntb\z@\relax
+      \expandafter\expandafter\expandafter\si@switchtrue
+    \fi
+    \edef\si@num@postdec{\the\si@tempcntb\si@num@postdec}%
+  \fi
+  \advance\si@tempcnta\m@ne\relax
+  \si@num@rnd}
+\newcommand*{\si@num@int}[1]{%
+  \renewcommand*{\si@num@predec}{}%
+  \ifsi@sepfour
+    \si@num@intfmt{}#1\@empty\@empty\@empty
+  \else
+    \si@num@iffive{#1}
+      {\si@num@intfmt{}#1\@empty\@empty\@empty}
+      {\renewcommand*{\si@num@predec}{#1}}%
+  \fi}
+\newcommand*{\si@num@iffive}[1]{%
+  \si@num@five#1\@empty\@empty\@empty\@empty\@empty\end}
+\def\si@num@five#1#2#3#4#5\end{%
+   \ifx\@empty#5\@empty
+      \expandafter\@secondoftwo
+   \else
+      \expandafter\@firstoftwo
+   \fi}
+\newcommand*{\si@num@intfmt}[4]{%
+  \ifx\@empty#2\@empty
+    \si@num@intsep#1\relax
+  \else
+    \ifx\@empty#3\@empty
+      \si@num@intsep\@empty\@empty#1#2\relax
+    \else
+      \ifx\@empty#4\@empty
+        \si@num@intsep\@empty#1#2#3\relax
+      \else
+        \si@num@fiint{#1#2#3#4}%
+      \fi
+    \fi
+  \fi}
+\def\si@num@fiint#1\fi\fi\fi{\fi\fi\fi\si@num@intfmt{#1}}
+\newcommand*{\si@num@intsep}[4]{%
+  \protected@edef\si@num@predec{\si@num@predec#1#2#3}%
+  \if\relax#4\relax\else
+    \protected@edef\si@num@predec{%
+      \si@num@predec\ensuremath{\noexpand\si@digitsep}}%
+    \expandafter\si@num@intsep\expandafter#4%
+  \fi}
+\newcommand*{\si@num@dec}[1]{%
+  \renewcommand*{\si@num@postdec}{}%
+  \ifsi@sepfour
+    \si@num@decfmt#1\@empty\@empty\@empty\@empty
+  \else
+    \si@num@iffive{#1}
+      {\si@num@decfmt#1\@empty\@empty\@empty\@empty}
+      {\protected@edef\si@num@postdec{\si@num@postdec#1}}%
+  \fi}
+\newcommand*{\si@num@decfmt}[4]{%
+  \protected@edef\si@num@postdec{\si@num@postdec#1#2#3}%
+  \ifx\@empty#4\@empty%
+  \else
+    \protected@edef\si@num@postdec{%
+      \si@num@postdec\ensuremath{\noexpand\si@digitsep}}%
+    \expandafter\si@num@decfmt\expandafter#4%
+  \fi}
+\newcommand*{\si@num@procerr}{%
+  \si@num@addunit
+  \ensuremath{\si@pm}%
+  \expandafter\si@num\expandafter{\si@num@err}}
+\newcommand*{\si@num@sepxpart}{%
+  \si@num@addunit
+  \ensuremath{\times}%
+  \expandafter\expandafter\expandafter\si@num\expandafter
+    \expandafter\expandafter{%
+      \expandafter\@cdr\si@num@xpart\@nil}}
+\newcommand*{\si@num@addunit}{%
+  \si@unt@numtrue
+  \ifx\@empty\si@unt@unitarg\@empty\else
+    \ifsi@repeatunits
+      \si@unt@printunit{\si@unt@unitarg}%
+    \fi
+  \fi}
+\si@newrobustcmd*{\ang}[2][]{%
+  \begingroup
+    \sisetup{#1}%
+    \si@fam@mode
+    \si@log@debug{Processing \string\ang\space input `#2'}%
+    \@makeother{\;}%
+    \makeatletter
+    \scantokens{\si@ang@parse#2;;;\@nil}}
+\def\si@ang@parse#1;#2;#3;#4\@nil{%
+  \let\ifsi@ang@fixdp\ifsi@fixdp
+  \si@fixdpfalse
+  \si@ifmtarg{#4}
+    {\si@log@debug{Angle argument contains no
+       semi-colons:\MessageBreak decimal angle}%
+     \si@ang@dec{#1}{}{}}
+    {\si@log@debug{Angle argument contains
+       semi-colons:\MessageBreak degree-minute-second angle}%
+     \renewcommand*{\si@tempa}{#4}%
+     \renewcommand*{\si@tempb}{;;}%
+     \ifx\si@tempa\si@tempb\else
+       \ifsi@strictarc
+         \renewcommand*{\si@tempb}{;}%
+         \ifx\si@tempa\si@tempb
+           \si@log@err{Insufficient semi-colons in argument
+             of \string\ang}{The argument of
+             \string\ang\space  must contain either no
+             semi-colons or exactly two}%
+         \else
+           \si@log@err{Excess semi-colons in argument of
+             \string\ang}{The argument of \string\ang\space
+             must contain either no semi-colons or exactly
+             two}%
+         \fi
+       \fi
+     \fi
+     \si@ang@arc{#1}{#2}{#3}}}
+\newcommand*{\si@ang@dec}{%
+  \let\si@ang@fix\@gobble
+  \ifsi@ang@toarc
+    \expandafter\si@ang@dectoarc
+  \else
+    \sisetup{padangle=none}\expandafter\si@ang@typeset
+  \fi}
+\newcommand*{\si@ang@arc}{%
+  \let\si@ang@fix\si@ang@arcfix
+  \ifsi@ang@todec
+    \expandafter\si@ang@arctodec
+  \else
+    \expandafter\si@ang@typeset
+  \fi}
+\newif\ifsi@ang@fixdp
+\newcommand*{\si@ang@fix}[1]{}
+\newcommand*{\si@ang@arcfix}[1]{%
+  \renewcommand*{\si@tempa}{second}%
+  \renewcommand*{\si@tempb}{#1}%
+  \ifx\si@tempa\si@tempb
+    \ifsi@ang@fixdp
+      \expandafter\expandafter\expandafter\si@fixdptrue
+    \else
+      \expandafter\expandafter\expandafter\si@fixdpfalse
+    \fi
+  \else
+    \expandafter\si@fixdpfalse
+  \fi}
+\newcommand*{\si@ang@ifnum}[1]{%
+  \begingroup
+    \renewcommand*{\si@numvalid}{0123456789,.+-}%
+    \ifx\@empty#1\@empty
+      \aftergroup\@firstoftwo
+    \else
+      \si@num@ifvalid{#1}
+        {\aftergroup\@firstoftwo}
+        {\aftergroup\@secondoftwo}%
+    \fi
+  \endgroup}
+\newcommand*{\si@ang@arctodec}[3]{%
+  \let\si@ang@fix\@gobble
+  \ifnum\si@num@dp>\thr@@\relax
+    \si@num@dp\thr@@\relax
+  \fi
+  \si@fixdptrue
+  \si@ang@ifnum{#1}
+    {\si@ang@ifnum{#2}
+      {\si@ang@ifnum{#3}
+        {\si@tempdima\z@\relax
+         \renewcommand*{\si@tempa}{+}%
+         \ifx\@empty#1\@empty\else
+           \si@tempdima #1pt\relax
+         \fi
+         \ifdim\si@tempdima<\z@\relax
+           \renewcommand*{\si@tempa}{-}%
+         \fi
+         \ifx\@empty#2\@empty\else
+           \si@tempdima\dimexpr\si@tempdima\si@tempa
+             #2pt/60\relax
+         \fi
+         \ifdim\si@tempdima<\z@\relax
+           \renewcommand*{\si@tempa}{-}%
+         \else
+         \fi
+         \ifx\@empty#3\@empty\else
+           \si@tempdima\dimexpr\si@tempdima\si@tempa
+             #3pt/3600\relax
+         \fi
+         \sisetup{numdecimal=.}%
+         \expandafter\si@ang@typeset\expandafter{%
+           \strip@pt\si@tempdima}{}{}}
+        {\si@ang@notnum{#1}{#2}{#3}}}
+      {\si@ang@notnum{#1}{#2}{#3}}}
+    {\si@ang@notnum{#1}{#2}{#3}}}
+\newcommand*{\si@ang@dectoarc}[1]{%
+  \let\si@ang@fix\si@ang@arcfix
+  \si@ang@fixdptrue
+  \ifnum\si@num@dp>\@ne\relax
+    \si@num@dp\@ne\relax
+  \fi
+  \si@ang@ifnum{#1}
+    {\si@tempdima\z@\relax
+     \ifx\@empty#1\@empty\else
+       \si@tempdima #1pt\relax
+     \fi
+     \si@ang@sepint{deg}%
+     \si@tempdima\dimexpr\si@tempdima *60\relax
+     \si@ang@sepint{min}%
+     \edef\si@tempa{\the\dimexpr\si@tempdima *60\relax}%
+     \expandafter\newcommand\expandafter*\expandafter{%
+       \expandafter\si@ang@arcsec\expandafter}\expandafter{%
+       \expandafter\si@ang@strippt\si@tempa}%
+     \si@tempdima\z@\relax
+     \edef\si@tempa{\the\si@tempdima}%
+     \expandafter\renewcommand\expandafter*\expandafter{%
+       \expandafter\si@tempa\expandafter}\expandafter{%
+       \expandafter\si@ang@strippt\si@tempa}%
+     \ifx\si@tempa\si@ang@arcsec
+       \renewcommand*{\si@ang@arcsec}{0}%
+     \fi
+     \renewcommand*{\si@tempa}{0}%
+     \ifx\si@ang@arcdeg\si@tempa
+       \si@temptoks{{}}%
+     \else
+       \si@temptoks{{\si@ang@arcdeg}}%
+     \fi
+     \ifx\si@ang@arcmin\si@tempa
+       \si@temptoks\expandafter{\the\si@temptoks{}}%
+     \else
+       \si@temptoks\expandafter{\the\si@temptoks{%
+         \si@ang@arcmin}}%
+     \fi
+     \ifx\si@ang@arcsec\si@tempa
+       \si@temptoks\expandafter{\the\si@temptoks{}}%
+     \else
+       \si@temptoks\expandafter{\the\si@temptoks{%
+         \si@ang@arcsec}}%
+     \fi
+     \expandafter\si@ang@typeset\the\si@temptoks}
+    {\si@ang@notnum{#1}{}{}}}
+\newcommand*{\si@ang@sepint}[1]{%
+  \expandafter\si@ang@sint\the\si@tempdima\@empty
+  \expandafter\let\csname si@ang@arc#1\endcsname\si@tempa}
+\def\si@ang@sint#1.#2\@empty{%
+  \renewcommand*{\si@tempa}{#1}%
+  \si@tempdima 0.#2\relax}
+\begingroup
+  \catcode`P=12
+  \catcode`T=12
+  \lowercase{
+    \renewcommand*{\si@tempa}{%
+      \def\si@ang@strippt##1PT{##1}}}
+  \expandafter\endgroup
+\si@tempa
+\newcommand*{\si@ang@notnum}[3]{%
+  \si@log@warn{Angle `#1;#2;#3' is not a pure
+    number:\MessageBreak output will be as given}%
+  \si@ang@typeset{#1}{#2}{#3}}
+\newif\ifsi@ang@sign
+\newcommand*{\si@ang@typeset}[3]{%
+  \ifsi@ang@padlarge
+    \newcommand*{\si@ang@degs}{0\si@sym@degree}%
+    \newcommand*{\si@ang@mins}{0\si@sym@minute}%
+    \newcommand*{\si@ang@secs}{0\si@sym@second}%
+  \else
+    \newcommand*{\si@ang@degs}{}%
+    \newcommand*{\si@ang@mins}{}%
+    \newcommand*{\si@ang@secs}{}%
+  \fi
+  \protected@edef\si@ang@decimalsymbol{\si@decimalsymbol}%
+  \ifsi@astroang
+    \let\si@ang@movesign\si@ang@astrosign
+  \else
+    \let\si@ang@movesign\@gobble
+  \fi
+  \newcommand*{\si@ang@secnum}{\si@ang@num{second}}%
+  \newcommand*{\si@ang@minnum}{\si@ang@num{minute}}%
+   \si@ifnotmtarg{#3}
+     {\si@log@debug{Found seconds `#3'}%
+      \si@ang@ifnum{#3}
+        {\ifdim #3 pt=\z@\relax\else
+           \si@ang@signtrue
+         \fi}{}%
+      \renewcommand*{\si@ang@secs}
+       {\si@ang@secnum{#3}\si@sym@second}%
+      \renewcommand*{\si@ang@mins}
+        {\si@ang@pad{0\si@sym@minute}}%
+      \renewcommand*{\si@ang@degs}
+        {\si@ang@pad{0\si@sym@degree}}}%
+   \si@ifnotmtarg{#2}
+     {\si@log@debug{Found minutes `#2'}%
+      \si@ang@ifnum{#2}
+        {\ifdim #2 pt=\z@\relax\else
+           \si@ang@signtrue
+         \fi}{}%
+      \renewcommand*{\si@ang@secnum}{%
+        \si@ang@signlessnum{second}}%
+      \renewcommand*{\si@ang@mins}
+       {\si@ang@minnum{#2}\si@sym@minute}%
+      \renewcommand*{\si@ang@degs}
+        {\si@ang@pad{0\si@sym@degree}}}%
+   \si@ifnotmtarg{#1}
+     {\si@log@debug{Found degrees `#1'}%
+      \renewcommand*{\si@ang@secnum}{%
+        \si@ang@signlessnum{second}}%
+      \renewcommand*{\si@ang@minnum}{%
+        \si@ang@signlessnum{minute}}%
+      \renewcommand*{\si@ang@degs}
+       {\si@ang@num{degree}{#1}%
+        \si@sym@degree}}%
+   \si@out@num
+     {\si@ang@degs\si@anglesep\si@ang@mins\si@anglesep
+        \si@ang@secs}%
+   \endgroup}
+\newcommand*{\si@ang@pad}[1]{\ifsi@ang@padsmall #1\fi}
+\newcommand*{\si@ang@num}[2]{%
+  \begingroup
+    \si@ang@fix{#1}%
+    \si@ang@movesign{#1}%
+    \si@num{#2}%
+  \endgroup}
+\newcommand*{\si@ang@signlessnum}[2]{%
+  \begingroup
+    \si@ang@fix{#1}%
+    \si@ang@movesign{#1}%
+    \sisetup{addsign=none}%
+    \si@num{#2}%
+  \endgroup}
+\newcommand*{\si@ang@killdegree}{\let\si@sym@degree\relax}
+\newcommand*{\si@ang@killminute}{\let\si@sym@minute\relax}
+\newcommand*{\si@ang@killsecond}{\let\si@sym@second\relax}
+\newcommand*{\si@ang@astrosign}[1]{%
+  \renewcommand*{\si@decimalsymbol}{%
+    \setbox\si@tempboxa=\hbox{%
+      \ensuremath{{\si@ang@decimalsymbol}}}%
+    \si@tempdima\wd\si@tempboxa\relax
+    \setbox\si@tempboxb=\hbox to\z@{%
+      \hss\unhbox\si@tempboxa\hss}%
+    \setbox\si@tempboxa=\hbox{%
+      \csname si@sym@#1\endcsname\hskip-\scriptspace}%
+    \si@tempdimb\wd\si@tempboxa\relax
+    \setbox\si@tempboxc=\hbox to\z@{%
+      \hss\unhbox\si@tempboxa\hss}%
+    \setbox\si@tempboxd=\hbox{%
+      \usebox\si@tempboxb\usebox\si@tempboxc}%
+    \ifdim\si@tempdima>\si@tempdimb\relax
+      \setbox\si@tempboxa=\hbox to\si@tempdima{%
+        \hss\unhbox\si@tempboxd\hss}%
+    \else
+      \setbox\si@tempboxa=\hbox to\si@tempdimb{%
+        \hss\unhbox\si@tempboxd\hss}%
+    \fi
+    \usebox\si@tempboxa%
+    \ifdim\si@tempdima>\si@tempdimb\relax\else
+      \hskip\scriptspace
+    \fi}%
+  \renewcommand*{\si@num@decimalhook}{\expandafter\aftergroup
+    \csname si@ang@kill#1\endcsname}}%
+\edef\si@tempa{%
+  \noexpand\NC@do S\noexpand\NC@do s\the\NC@list}
+\newcolumntype{S}{}
+\newcolumntype{s}{}
+\NC@list\expandafter{\si@tempa}
+\renewcommand*{\NC@rewrite@S}[1][]{%
+  \edef\si@tempa{\the\@temptokena
+    >{\noexpand\si@tab@begin@S[#1]}c%
+    <{\noexpand\si@tab@end@S}}%
+  \@temptokena\expandafter{\si@tempa}%
+  \NC@find}
+\renewcommand*{\NC@rewrite@s}[1][]{%
+  \edef\si@tempa{\the\@temptokena
+    >{\noexpand\si@tab@begin@s[#1]}c%
+    <{\noexpand\si@tab@end@s}}%
+  \@temptokena\expandafter{\si@tempa}%
+  \NC@find}
+\newcommand*{\si@tab@begin@S}[1][]{%
+  \si@log@debug{Processing S column cell contents}%
+  \let\si@tab@gettok\si@tab@gettok@S
+  \si@seperrfalse
+  \renewcommand*{\si@num@sepxpart}{%
+    \si@log@err{Multiple numbers not allowed in
+       tables\MessageBreak Only the first number used}
+       \@ehb}%
+  \si@tab@begin[#1]}
+\newcommand*{\si@tab@begin@s}[1][]{%
+  \si@log@debug{Processing s column cell contents}%
+  \let\si@tab@gettok\si@tab@gettok@s
+  \si@tab@begin[#1]}
+\newtoks\si@tab@toks
+\newtoks\si@tab@pretoks
+\newtoks\si@tab@posttoks
+\newcommand*{\si@tab@begin}[1][]{%
+  \begingroup
+    \sisetup{#1}%
+    \si@tab@toks{}%
+    \si@tab@pretoks{}%
+    \si@tab@posttoks{}%
+    \si@switchfalse
+    \si@tab@gettok}
+\newcommand*{\si@tab@gettok@S}[1]{%
+  \ifx\tabularnewline#1\relax
+    \let\si@tab@next\si@tab@newline@S
+  \else
+    \ifx\end#1\relax
+      \let\si@tab@next\end
+    \else
+      \ifx\si@tab@end@S#1\relax
+        \let\si@tab@next\si@tab@end@S
+      \else
+        \ifx\endtabular#1\relax
+          \let\si@tab@next\endtabular
+        \else
+          \ifx\csname#1\relax
+            \let\si@tab@next\csname
+          \else
+            \ifx\relax#1\relax
+              \let\si@tab@next\relax
+            \else
+              \let\si@tab@next\si@tab@gettok@S
+              \si@str@ifchrstr{#1}{\si@numvalid}
+                {\si@switchtrue
+                 \si@log@debug{Found numerical cell
+                   contents `#1'}%
+                 \si@tab@toks=\expandafter{%
+                   \the\si@tab@toks#1}}
+                {\si@log@debug{Found other cell contents
+                   \string#1}%
+                 \si@tab@othertok{#1}}%
+            \fi
+          \fi
+        \fi
+      \fi
+    \fi
+  \fi
+  \si@tab@next}
+\newcommand*{\si@tab@othertok}[1]{%
+  \ifsi@switch
+    \si@tab@posttoks=\expandafter{\the\si@tab@posttoks#1}%
+  \else
+    \si@tab@pretoks=\expandafter{\the\si@tab@pretoks#1}%
+  \fi}
+\newcommand*{\si@tab@gettok@s}[1]{%
+  \ifx\tabularnewline#1\relax
+    \let\si@tab@next\si@tab@newline@s
+  \else
+    \ifx\end#1\relax
+      \let\si@tab@next\end
+    \else
+      \ifx\si@tab@end@s#1\relax
+        \let\si@tab@next\si@tab@end@s
+      \else
+        \ifx\endtabular#1\relax
+          \let\si@tab@next\endtabular
+        \else
+          \ifx\csname#1\relax
+            \let\si@tab@next\csname
+          \else
+            \ifx\relax#1\relax
+              \let\si@tab@next\relax
+            \else
+              \let\si@tab@next\si@tab@gettok@s
+                  \si@tab@toks=\expandafter{%
+                    \the\si@tab@toks#1}%
+                  \si@log@debug{Found cell contents `#1'}%
+            \fi
+          \fi
+        \fi
+      \fi
+    \fi
+  \fi
+  \si@tab@next}
+\newcommand*{\si@tab@end@S}{%
+    \ifsi@switch
+      \let\si@tab@lfill\si@tab@lfill@S
+      \let\si@tab@rfill\si@tab@rfill@S
+    \else
+      \let\si@tab@rfill\si@tab@rfill@t
+      \let\si@tab@lfill\si@tab@lfill@t
+    \fi
+    \si@tab@lfill\relax
+    \the\si@tab@pretoks
+    \ifsi@switch
+      \expandafter\si@tab@numout
+    \fi
+    \the\si@tab@posttoks
+    \si@tab@rfill\relax
+  \endgroup}
+\newcommand*{\si@tab@end@s}{%
+    \si@tab@lfill@s\relax
+    \expandafter\si\expandafter{\the\si@tab@toks}%
+    \si@tab@rfill@s\relax
+  \endgroup}
+\newcommand*{\si@tab@newline@S}{%
+  \si@tab@end@S
+  \hfil\relax
+  \let\si@tab@end\si@tab@end@S
+  \renewcommand*{\si@tab@end@S}{\let\si@tab@end@S\si@tab@end}%
+  \tabularnewline}
+\newcommand*{\si@tab@newline@s}{%
+  \si@tab@end@s
+  \hfil\relax
+  \let\si@tab@end\si@tab@end@s
+  \renewcommand*{\si@tab@end@s}{\let\si@tab@end@s\si@tab@end}%
+  \tabularnewline}
+\newcount\si@tempcnta
+\newcount\si@tempcntb
+\newcommand*{\si@tab@numout}{%
+  \si@num@intabtrue
+  \ifsi@tab@fixed
+    \ifsi@tabautofit
+      \si@num@dp\si@tab@mantpostcnt\relax
+      \expandafter\expandafter\expandafter\si@fixdptrue
+    \fi
+  \fi
+  \expandafter\si@num\expandafter{\the\si@tab@toks}%
+  \si@tab@format}
+\newbox\si@tab@prebox
+\newbox\si@tab@midbox
+\newbox\si@tab@postbox
+\newbox\si@tab@expbox
+\newcommand*{\si@tab@format}{%
+  \ifsi@tab@fixed
+    \expandafter\si@tab@fixed
+  \else
+    \expandafter\si@tab@unfixed
+  \fi
+  \ifsi@colourvalues
+    \si@fam@colourcmd{\si@valuecolour}%
+  \fi
+  \box\si@tab@prebox\box\si@tab@midbox\box\si@tab@postbox%
+    \box\si@tab@expbox}
+\newcommand*\si@tab@unfixed{%
+  \si@log@debug{Using variable width S column}%
+  \protected@edef\si@num@out{\si@num@out\si@tab@expout}%
+  \setbox\si@tab@prebox=\hbox
+    {\expandafter\si@out@num\expandafter{\si@tab@out}}%
+  \ifx\@empty\si@num@out\@empty
+    \setbox\si@tab@midbox=\hbox
+      {\phantom{\ensuremath{{\si@decimalsymbol}}}}%
+  \else
+    \setbox\si@tab@midbox=\hbox
+      {\ensuremath{{\si@decimalsymbol}}}%
+  \fi
+  \setbox\si@tab@postbox=\hbox
+    {\expandafter\si@out@num\expandafter{\si@num@out}}%
+  \ifdim\wd\si@tab@prebox>\wd\si@tab@postbox\relax
+    \setbox\si@tab@postbox=\hbox to\wd\si@tab@prebox%
+      {\unhbox\si@tab@postbox\hfill}%
+  \else
+    \setbox\si@tab@prebox=\hbox to\wd\si@tab@postbox%
+      {\hfill\unhbox\si@tab@prebox}%
+  \fi
+  \setbox\si@tab@expbox=\hbox{}}
+\newdimen\si@tab@predim
+\newdimen\si@tab@postdim
+\newdimen\si@tab@expdim
+\newdimen\si@tempdima
+\newdimen\si@tempdimb
+\newcommand*{\si@tab@sp}{}
+\newcommand*{\si@tab@fixed}{%
+  \si@log@debug{Using fixed-width S column}%
+  \let\si@tab@sp\relax
+  \setbox\si@tab@midbox=\hbox{}%
+  \setbox\si@tab@expbox=\hbox{}%
+  \setbox\si@tempboxa=\hbox{\si@out@num{1}}%
+  \si@tempdima\wd\si@tempboxa\relax
+  \si@tab@predim\the\si@tab@mantprecnt\si@tempdima\relax
+  \si@tab@sepcorr{mantpre}{pre}%
+  \si@tab@postdim\si@tab@mantpostcnt\si@tempdima\relax
+  \setbox\si@tempboxa=\hbox{\ensuremath{{\si@decimalsymbol}}}%
+  \advance\si@tab@postdim\wd\si@tempboxa\relax
+  \si@tab@sepcorr{mantpost}{post}%
+  \setbox\si@tempboxa=\hbox{\si@out@num{^{1}}}%
+  \si@tempdima\wd\si@tempboxa\relax
+  \ifnum\si@tab@expprecnt>\z@\relax
+    \si@tab@expdim\si@tab@expprecnt\si@tempdima\relax
+    \si@tab@sepcorr{exppre}{exp}%
+  \fi
+  \let\si@tab@sp\sp
+  \ifnum\si@tab@exppostcnt>\z@\relax
+    \advance\si@tab@expdim\si@tab@exppostcnt\si@tempdima\relax
+    \setbox\si@tempboxa=\hbox{%
+      \ensuremath{^{\si@decimalsymbol}}}%
+    \advance\si@tab@expdim\wd\si@tempboxa\relax
+    \si@tab@sepcorr{exppost}{exp}%
+  \fi
+  \setbox\si@tempboxa=\hbox{\ensuremath{-}}%
+  \ifsi@tab@mantsign
+    \advance\si@tab@predim\wd\si@tempboxa\relax
+  \fi
+  \setbox\si@tempboxa=\hbox{\ensuremath{^{-}}}%
+  \ifsi@tab@expsign
+    \advance\si@tab@expdim\wd\si@tempboxa\relax
+  \fi
+  \si@tempcnta\si@tab@expprecnt\relax
+  \advance\si@tempcnta\si@tab@exppostcnt\relax
+  \ifnum\si@tempcnta>\z@\relax
+    \setbox\si@tempboxa=\hbox{\ensuremath{%
+      {}\si@expproduct{}\si@expbase}}%
+    \advance\si@tab@expdim\wd\si@tempboxa\relax
+  \fi
+  \ifsi@tabalignexp\else
+    \advance\si@tab@postdim\si@tab@expdim\relax
+  \fi
+  \setbox\si@tab@prebox=\hbox to\si@tab@predim{\hss\hfill
+    \expandafter\si@out@num\expandafter{\si@tab@out}}%
+  \ifx\@empty\si@num@out\@empty
+    \setbox\si@tab@postbox=\hbox to\si@tab@postdim
+      {\expandafter\si@out@num\expandafter{\si@num@out}\hfil}%
+  \else
+    \ifsi@tabalignexp\else
+      \protected@edef\si@num@out{\si@num@out\si@tab@expout}%
+    \fi
+    \setbox\si@tab@postbox=\hbox to\si@tab@postdim
+      {\ensuremath{{\si@decimalsymbol}}\expandafter\si@out@num
+        \expandafter{\si@num@out}\hfil}%
+  \fi
+  \ifx\@empty\si@tab@expout\@empty
+    \ifsi@tabalignexp
+      \setbox\si@tab@expbox=\hbox to\si@tab@expdim{\hfil}%
+    \fi
+  \else
+    \ifsi@tabalignexp
+      \setbox\si@tab@expbox=\hbox to\si@tab@expdim
+        {\expandafter\si@out@num\expandafter{\si@tab@expout}%
+           \hfil}%
+    \fi
+  \fi}
+\newcommand*{\si@tab@sepcorr}[2]{%
+  \expandafter\si@tempcnta\expandafter\the
+    \csname si@tab@#1cnt\endcsname\relax
+  \divide\si@tempcnta\thr@@\relax
+  \ifsi@sepfour\else
+    \expandafter\ifnum\expandafter\the
+      \csname si@tab@#1cnt\endcsname=4\relax
+      \si@tempcnta\z@\relax
+    \fi
+  \fi
+  \setbox\si@tempboxa=\hbox{%
+    \ensuremath{\si@tab@sp{\si@digitsep}}}%
+  \expandafter\advance\csname si@tab@#2dim\endcsname
+    \si@tempcnta\wd\si@tempboxa}
+\si@newrobustcmd*{\SI}[2][]{%
+  \@ifnextchar[%]
+    {\si@SI[#1]{#2}}
+    {\si@SI[#1]{#2}[]}}
+\si@newrobustcmd*{\si}[2][]{\si@SI[#1]{}[]{#2}}
+\newcommand*{\newunit}[3][]{%
+  \si@ifdefinable{#2}
+    {\si@unt@defunit[#1]{#2}{#3}}
+    {\si@log@err{Unit \string#2 already defined!}\@eha}}
+\newcommand*{\renewunit}[3][]{%
+  \si@ifdefinable{#2}
+    {\si@log@err{Unit \string#2 undefined}\@ehc
+     \si@unt@defunit[#1]{#2}{#3}}
+    {\si@log@inf{Redefining unit \string#2}%
+     \si@unt@defunit[#1]{#2}{#3}}}
+\newcommand*{\provideunit}[3][]{%
+  \si@ifdefinable{#2}
+    {\si@unt@defunit[#1]{#2}{#3}}
+    {}}
+\newcommand*{\newprefix}[4][]{%
+  \si@ifdefinable{#2}
+    {\si@unt@defprefix[#1]{#2}{#3}{#4}}
+    {\si@log@err{Prefix \string#2 already defined!}\@eha}}
+\newcommand*{\renewprefix}[4][]{%
+  \si@ifdefinable{#2}
+    {\si@log@err{Prefix \string#2 undefined}\@ehc
+     \si@unt@defprefix[#1]{#2}{#3}{#4}}
+    {\si@log@inf{Redefining prefix \string#2}%
+     \si@unt@defprefix[#1]{#2}{#3}{#4}}}
+\newcommand*{\provideprefix}[4][]{%
+  \si@ifdefinable{#2}
+    {\si@unt@defprefix[#1]{#2}{#3}{#4}}
+    {}}
+\newcommand*{\newpower}[3][]{%
+  \si@ifdefinable{#2}
+    {\si@unt@defpower[#1]{#2}{#3}}
+    {\si@log@err{Power \string#2 already defined!}\@eha}}
+\newcommand*{\renewpower}[3][]{%
+  \si@ifdefinable{#2}
+    {\si@log@err{Power \string#2 undefined}\@ehc
+     \si@unt@defpower[#1]{#2}{#3}}
+    {\si@log@inf{Redefining power \string#2}%
+     \si@unt@defpower[#1]{#2}{#3}}}
+\newcommand*{\providepower}[3][]{%
+  \si@ifdefinable{#2}
+    {\si@unt@defpower[#1]{#2}{#3}}
+    {}}
+\newif\ifsi@unt@num
+\newcommand*{\si@unt@unitarg}{}
+\newcommand*{\si@unt@SIopts}{}
+\def\si@SI[#1]#2[#3]#4{%
+  \begingroup
+    \si@ifnotmtarg{#1}
+      {\sisetup{#1}%
+       \renewcommand*{\si@unt@SIopts}{#1}}%
+    \si@unt@numfalse
+    \si@xspacefalse
+    \si@ifnotmtarg{#3}
+      {\si@log@debug{Prefix unit found}%
+       \si@unt@printunit{#3}}%
+    \si@ifnotmtarg{#4}
+      {\renewcommand*{\si@unt@unitarg}{#4}}%
+    \si@ifnotmtarg{#2}
+      {\si@log@debug{Number found in \string\SI\space
+         argument}%
+       \ifsi@repeatunits\else
+         \ifsi@trapambigerr
+           \expandafter\expandafter\expandafter
+             \si@num@ambigerrtrue
+         \fi
+       \fi
+       \num{#2}%
+       \si@unt@numtrue}%
+    \si@ifnotmtarg{#4}
+      {\si@ifmtarg{#2}
+         {\si@unt@printunit{#4}}
+         {\si@tempcnta\z@\relax
+         \ifsi@addunitpower
+           \si@unt@countx{#2}%
+         \fi
+          \ifnum\si@tempcnta>\z@\relax
+            \advance\si@tempcnta\@ne\relax
+            \edef\si@tempa{\noexpand\tothe{\si@tempcnta}}%
+            \renewcommand*{\si@tempb}{#4}%
+            \expandafter\expandafter\expandafter
+            \si@unt@printunit\expandafter\expandafter
+            \expandafter{%
+              \expandafter\si@tempb\si@tempa}%
+          \else
+            \si@unt@printunit{#4}%
+          \fi}}%
+  \endgroup}
+\newcommand*{\si@unt@countx}[1]{%
+  \si@tempcnta\z@\relax
+  \expandafter\si@unt@cntx#1\@empty\@empty}
+\def\si@unt@cntx#1#2\@empty{%
+  \si@str@ifchrstr{#1}{\si@numprod}
+    {\advance\si@tempcnta\@ne\relax}
+    {}%
+  \ifx\@empty#2\@empty\else
+    \si@unt@cntx#2\@empty\@empty
+  \fi}
+\newif\ifsi@unt@littest
+\newcommand*{\si@unt@ifliteral}[1]{%
+  \begingroup
+    \si@unt@littesttrue
+    \setbox\si@tempboxa=\hbox{\si@unt@out{#1}}%
+    \ifdim\wd\si@tempboxa>\z@\relax
+      \aftergroup\@firstoftwo
+    \else
+      \aftergroup\@secondoftwo
+    \fi
+  \endgroup}
+\newif\ifsi@unt@litout
+\newcommand*{\si@unt@printunit}[1]{%
+  \si@unt@ifliteral{#1}
+    {\si@log@debug{Literal items found in unit
+      argument:\MessageBreak outputting without further
+      processing}%
+     \si@unt@litouttrue
+     \si@unt@addvaluesep
+     \si@unt@out{#1}}
+    {\si@log@debug{Macro unit found:\MessageBreak
+       processing to format output}%
+     \si@unt@init
+     \advance\si@unt@depthcnt\@ne\relax
+     #1%
+     \si@unt@final}}
+\newcommand*{\si@unt@addvaluesep}{%
+  \ifsi@unt@num
+    \expandafter\si@unt@addvalsep
+  \fi}
+\newcommand*{\si@unt@addvalsep}{%
+  \ifsi@unt@litout
+    \expandafter\si@unt@litvalsep
+  \else
+    \expandafter\si@unt@stackvalsep
+  \fi}
+\newcommand*{\si@unt@stackvalsep}{%
+  \protected@edef\si@unt@spstack{\si@valuesep}}
+\newcommand*{\si@unt@litvalsep}{%
+  \nobreak\ensuremath{\si@valuesep}\nobreak}
+\newcommand*{\si@unt@spstack}{}
+\newcommand*{\si@unt@stacka}{}
+\newcommand*{\si@unt@stackb}{}
+\newcount\si@unt@unitcnta
+\newcount\si@unt@unitcntb
+\newcount\si@unt@depthcnt
+\newif\ifsi@unt@first
+\si@unt@depthcnt\m@ne\relax
+\newcommand*{\si@unt@init}{%
+  \begingroup
+    \si@unt@litoutfalse
+    \si@unt@litprefixfalse
+    \si@unt@firsttrue
+    \si@unt@perfalse
+    \si@unt@perseenfalse
+    \si@unt@prepowerfalse
+    \si@unt@depthcnt\z@\relax
+    \si@unt@powerdim\z@\relax
+    \si@unt@unitcnta\z@\relax
+    \si@unt@unitcntb\z@\relax
+    \si@unt@prefixcnt\z@\relax
+    \renewcommand*{\si@unt@spstack}{}%
+    \renewcommand*{\si@unt@stacka}{}%
+    \renewcommand*{\si@unt@stackb}{}%
+    \renewcommand*{\si@unt@holdstacka}{}%
+    \renewcommand*{\si@unt@holdstackb}{}%
+    \renewcommand*{\si@unt@lastadda}{space}%
+    \renewcommand*{\si@unt@lastaddb}{space}}
+\newcommand*{\si@unt@final}{%
+    \si@unt@third
+    \si@unt@stackout
+  \endgroup
+  \ifsi@xspace
+    \expandafter\expandafter\expandafter\xspace
+  \fi}
+\newcommand*{\si@unt@defunit}[3][]{%
+  \si@log@debug{Declaring unit \string#2 with \MessageBreak
+    meaning \string#3}%
+  \si@ifnotmtarg{#1}
+    {\expandafter\@namedef\expandafter{%
+      \expandafter\@gobble\string#2@opt@unt@si}{#1}}%
+  \protected\def#2{%
+    \ifsi@allowoptarg
+      \expandafter\si@unt@withopt
+    \else
+      \expandafter\si@unt@noopt
+    \fi
+    {#2}{#3}}}
+\newcommand*{\si@unt@withopt}[2]{%
+  \@ifnextchar[%]
+    {\si@unt@opt{#1}{#2}}
+    {\si@unt@opt{#1}{#2}[]}}
+\newcommand*{\si@unt@noopt}[2]{\si@unt@opt{#1}{#2}[]}
+\def\si@unt@opt#1#2[#3]{%
+  \ifsi@unt@littest
+    \expandafter\si@gobblethree
+  \else
+    \ifsi@unt@litout
+      \expandafter\expandafter\expandafter\@gobbletwo
+    \else
+      \expandafter\expandafter\expandafter\si@unt@unit
+    \fi
+  \fi
+  {#3}{#1}{#2}}
+\long\def\si@gobblethree #1#2#3{}
+\newif\ifsi@unt@litprefix
+\si@unt@litprefixtrue
+\newcommand*{\si@unt@defprefix}[4][]{%
+  \si@log@debug{Declaring multiple \string#1 with\MessageBreak
+    meaning \string#4}%
+  \expandafter\expandafter\expandafter\def\expandafter
+    \csname\expandafter\@gobble\string#2@opt@si\endcsname{#1}%
+  \protected\def#2{%
+    \ifsi@unt@littest
+      \expandafter\si@gobblethree
+    \else
+      \ifsi@unt@litout
+        \expandafter\expandafter\expandafter\@gobbletwo
+      \else
+        \ifsi@unt@litprefix
+          \expandafter\expandafter\expandafter\expandafter
+            \expandafter\expandafter\expandafter\@gobbletwo
+        \else
+          \expandafter\expandafter\expandafter\expandafter
+            \expandafter\expandafter\expandafter\si@unt@prefix
+        \fi
+      \fi
+    \fi
+    {#2}{#3}{#4}}}
+\newcommand*{\si@unt@defpower}[3][]{%
+  \si@log@debug{Declaring power \string#2 with\MessageBreak
+    meaning \string#3}%
+  \expandafter\expandafter\expandafter\def\expandafter
+    \csname\expandafter\@gobble\string#2@opt@si\endcsname{#1}%
+  \protected\def#2{%
+    \ifsi@unt@littest
+      \expandafter\@gobbletwo
+    \else
+      \ifsi@unt@litout
+        \expandafter\expandafter\expandafter\si@unt@litpower
+      \else
+        \expandafter\expandafter\expandafter\si@unt@power
+      \fi
+    \fi
+    {#2}{#3}}}
+\newcommand*{\si@unt@unithook}{}
+\newcommand*{\si@unt@unit}[3]{%
+  \ifnum\si@unt@depthcnt=\m@ne\relax
+    \expandafter\si@unt@init
+  \fi
+  \advance\si@unt@depthcnt\@ne\relax
+  \si@log@debug{Unit processing: level \the\si@unt@depthcnt,
+    \MessageBreak unit \string#2}%
+  \si@unt@firstorsecond{#1}{#2}%
+  \si@unt@ifliteral{#3}
+    {\si@unt@addtostack{unit}{#3}%
+     \ifsi@unt@prepower
+       \expandafter\si@unt@stkpower
+     \fi}
+    {#3}%
+  \advance\si@unt@depthcnt\m@ne\relax
+  \ifnum\si@unt@depthcnt=\z@\relax
+    \expandafter\si@unt@final
+  \fi}
+\newcommand*{\si@unt@firstorsecond}[2]{%
+  \ifsi@unt@first
+    \expandafter\si@unt@first
+  \else
+    \expandafter\si@unt@second
+  \fi
+  {#1}{#2}}%
+\newcommand*{\si@unt@first}[2]{%
+  \si@ifnotmtarg{#1}
+    {\num{#1}%
+     \si@unt@numtrue}%
+  \si@unt@unithook
+  \ifcsname\expandafter\@gobble\string#2@opt@unt@si\endcsname
+    \expandafter\si@unt@setopts
+  \else
+    \expandafter\@gobble
+  \fi
+  {#2}%
+  \si@unt@addvaluesep
+  \si@unt@firstfalse}
+\newcommand*{\si@unt@setopts}[1]{%
+  \expandafter\expandafter\expandafter\expandafter\expandafter
+    \expandafter\expandafter\si@temptoks\expandafter
+    \expandafter\expandafter\expandafter\expandafter
+    \expandafter\expandafter{\expandafter%
+      \csname\expandafter\@gobble\string#1@opt@unt@si%
+      \endcsname}%
+  \expandafter\sisetup\expandafter{\the\si@temptoks}%
+  \si@log@debug{Applying options `\the\si@temptoks'
+    for\MessageBreak unit \string#1}%
+  \@ifundefined{si@unt@SIopts}{}
+    {\ifx\@empty\si@unt@SIopts\@empty\else
+       \expandafter\expandafter\si@unt@setSIopts
+     \fi}}
+\newcommand*{\si@unt@setSIopts}{%
+  \expandafter\si@temptoks\expandafter{\si@unt@SIopts}%
+  \expandafter\sisetup\expandafter{\the\si@temptoks}}
+\newcommand*{\si@unt@second}[2]{%
+  \si@ifnotmtarg{#1}
+    {\si@log@warn{Optional argument to unit macro\MessageBreak
+       allowed only for outer unit}}%
+  \si@unt@third
+  \si@unt@addtostack{space}{\ensuremath{\si@unitsep}}}
+\newcommand*{\si@unt@third}{%
+  \ifsi@unt@prepower\else
+    \expandafter\si@unt@stkpower
+  \fi
+  \renewcommand*{\si@tempa}{prefix}%
+  \expandafter\ifx
+    \csname si@unt@lastadd\si@unt@checkstack\endcsname\si@tempa
+  \else
+    \expandafter\si@unt@spacecheck
+  \fi
+  \ifsi@unt@per
+    \expandafter\si@unt@perseentrue
+  \fi}
+\newcommand*{\si@unt@spacecheck}{%
+  \renewcommand*{\si@tempa}{space}%
+  \expandafter\ifx
+    \csname si@unt@lastadd\si@unt@checkstack\endcsname\si@tempa
+  \else
+    \expandafter\si@unt@reciptest
+  \fi}
+\newcommand*{\si@unt@prefix}[3]{%
+  \si@unt@firstorsecond{}{#1}%
+  \ifsi@prefixsymbolic
+    \expandafter\si@unt@addprefix
+  \else
+    \expandafter\si@unt@countprefix
+  \fi
+  {#1}{#2}{#3}}
+\newcommand*{\si@unt@addprefix}[3]{%
+  \si@unt@addtostack{prefix}{#3}}
+\newcount\si@unt@prefixcnt
+\newcommand*{\si@unt@countprefix}[3]{%
+  \renewcommand*{\si@tempa}{binary}%
+  \expandafter\expandafter\expandafter\ifx\expandafter
+    \csname\expandafter\@gobble\string#1@opt@si\endcsname
+    \si@tempa
+    \expandafter\sisetup
+  \else
+    \expandafter\@gobble
+  \fi
+  {prefixbase=two}%
+  \si@tempcnta#2\relax
+  \ifsi@unt@per
+    \expandafter\si@unt@invprefix
+  \fi
+  \advance\si@unt@prefixcnt\si@tempcnta\relax}
+\newcommand*{\si@unt@invprefix}{%
+  \si@tempcntb\si@tempcnta\relax
+  \si@tempcnta -\si@tempcntb\relax}
+\newcommand*{\si@unt@litpower}[2]{\textsuperscript{#2}}
+\newif\ifsi@unt@prepower
+\newcommand*{\si@unt@power}[2]{%
+  \renewcommand*{\si@tempa}{post}%
+  \expandafter\expandafter\expandafter\ifx\expandafter
+    \csname\expandafter\@gobble\string#1@opt@si\endcsname
+    \si@tempa
+    \expandafter\@gobbletwo
+  \else
+    \expandafter\si@unt@firstorsecond
+  \fi
+  {}{\power}%
+  \si@unt@powerdim #2 pt\relax
+  \ifsi@frac\else
+    \ifsi@unt@per
+      \expandafter\expandafter\expandafter\si@unt@invpower
+    \fi
+  \fi
+  \renewcommand*{\si@tempa}{post}%
+  \si@unt@prepowertrue
+  \expandafter\expandafter\expandafter\ifx\expandafter
+    \csname\expandafter\@gobble\string#1@opt@si\endcsname
+    \si@tempa
+    \expandafter\si@unt@stackpower
+  \else
+    \si@log@debug{Power \strip@pt\si@unt@powerdim\space saved
+      to be added after\MessageBreak next unit}%
+  \fi}
+\newdimen\si@unt@powerdim
+\newcommand*{\si@unt@stackpower}{%
+  \si@unt@prepowerfalse
+  \si@unt@stkpower
+  \ifsi@stickyper\else
+    \si@unt@perfalse
+    \si@unt@perseenfalse
+  \fi}
+\newcommand*{\si@unt@stkpower}{%
+  \ifdim\si@unt@powerdim=\m@ne pt\relax
+    \ifsi@frac\else
+      \expandafter\expandafter\expandafter\si@unt@stkpwr
+    \fi
+  \else
+    \expandafter\si@unt@stkpwr
+  \fi}
+\newcommand*{\si@unt@stkpwr}{%
+  \ifdim\si@unt@powerdim=\z@\relax\else
+    \renewcommand*{\si@tempa}{unit}%
+    \expandafter\ifx
+      \csname si@unt@lastadd\si@unt@checkstack\endcsname
+      \si@tempa
+      \si@log@debug{Adding power
+        \strip@pt\si@unt@powerdim\space to output stack}%
+      \si@unt@addtostack{power}{^{\num{%
+        \strip@pt\si@unt@powerdim}}}%
+    \fi
+  \fi
+  \si@unt@powerdim\z@\relax}
+\newcommand*{\si@unt@invpower}{%
+  \si@tempdima\si@unt@powerdim\relax
+  \si@unt@powerdim -\si@tempdima\relax
+  \ifdim\si@unt@powerdim=\p@\relax
+    \si@unt@powerdim\z@\relax
+  \fi}
+\newif\ifsi@unt@per
+\newif\ifsi@unt@perseen
+\si@newrobustcmd*{\si@per}{%
+  \ifsi@unt@littest\else
+    \ifsi@unt@litout
+      \expandafter\expandafter\expandafter /%
+    \else
+      \ifsi@unt@litprefix
+        \expandafter\expandafter\expandafter\expandafter
+          \expandafter\expandafter\expandafter /%
+      \else
+        \expandafter\expandafter\expandafter\expandafter
+          \expandafter\expandafter\expandafter\si@unt@per
+      \fi
+    \fi
+  \fi}
+\newcommand*{\si@unt@per}{%
+  \si@unt@firstorsecond{}{\per}%
+  \ifsi@unt@per
+    \ifsi@stickyper\else
+      \expandafter\expandafter\expandafter\si@unt@perfalse
+    \fi
+  \else
+    \expandafter\si@unt@pertrue
+  \fi}
+\let\per\si@per
+\newcommand*{\si@unt@reciptest}{%
+  \ifsi@unt@per
+    \ifsi@unt@perseen
+      \expandafter\expandafter\expandafter\si@unt@recip
+    \fi
+  \fi}
+\newcommand*{\si@unt@recip}{%
+  \si@unt@powerdim\m@ne pt\relax
+  \si@unt@stackpower}
+\newcommand*{\si@unt@lastadda}{}
+\newcommand*{\si@unt@lastaddb}{}
+\newcommand*{\si@unt@addtostack}[2]{%
+  \renewcommand*{\si@tempa}{#1}%
+  \expandafter\ifx
+    \csname si@unt@lastadd\si@unt@checkstack\endcsname\si@tempa
+    \expandafter\@gobbletwo
+  \else
+    \expandafter\si@unt@preplussp
+  \fi
+  {#1}{#2}}
+\newcommand*{\si@unt@preplussp}[2]{%
+  \renewcommand*{\si@tempa}{prefix+space}%
+  \edef\si@tempb{%
+    \csname si@unt@lastadd\si@unt@checkstack\endcsname+#1}%
+  \ifx\si@tempa\si@tempb
+    \expandafter\@gobbletwo
+  \else
+    \expandafter\si@unt@stack
+  \fi
+  {#1}{#2}}
+\newcommand*{\si@unt@stack}[2]{%
+  \expandafter\renewcommand\expandafter*\expandafter{%
+    \csname si@unt@lastadd\si@unt@checkstack\endcsname}{#1}%
+  \renewcommand*{\si@tempa}{#1}%
+  \renewcommand*{\si@tempb}{unit}%
+  \ifx\si@tempa\si@tempb
+    \expandafter\si@unt@inccnt
+  \fi
+  \renewcommand*{\si@tempb}{space}%
+  \ifx\si@tempa\si@tempb
+    \expandafter\si@unt@holdspace
+  \else
+    \expandafter\si@unt@addstack
+  \fi
+  {#2}}
+\newcommand*{\si@unt@inccnt}{%
+  \expandafter\advance
+    \csname si@unt@unitcnt\si@unt@checkstack\endcsname
+    \@ne\relax}
+\newcommand*{\si@unt@holdstacka}{}
+\newcommand*{\si@unt@holdstackb}{}
+\newcommand*{\si@unt@holdspace}[1]{%
+  \renewcommand*{\si@tempa}{b}%
+  \edef\si@tempb{\si@unt@checkstack}%
+  \ifx\si@tempa\si@tempb
+    \ifx\@empty\si@unt@stackb\@empty
+    \else
+      \expandafter\protected@edef
+      \csname si@unt@holdstack\si@unt@checkstack\endcsname{#1}%
+    \fi
+  \else
+    \expandafter\protected@edef
+    \csname si@unt@holdstack\si@unt@checkstack\endcsname{#1}%
+  \fi}
+\newcommand*{\si@unt@addstack}[1]{%
+  \expandafter\protected@edef
+    \csname si@unt@stack\si@unt@checkstack\endcsname
+    {\csname si@unt@stack\si@unt@checkstack\endcsname
+     \csname si@unt@holdstack\si@unt@checkstack\endcsname#1}%
+  \expandafter\renewcommand\expandafter*\expandafter{%
+    \csname si@unt@holdstack\si@unt@checkstack\endcsname}{}}
+\newcommand*{\si@unt@stackout}{%
+  \si@unt@litouttrue
+  \ifsi@frac
+    \expandafter\si@unt@fracout
+  \else
+    \expandafter\si@unt@normout
+  \fi}
+\newcommand*{\si@unt@checkstack}{%
+  \ifsi@frac
+    \ifsi@unt@per
+      \expandafter\expandafter\expandafter b%
+    \else
+      \expandafter\expandafter\expandafter a%
+    \fi
+  \else
+    \expandafter a%
+  \fi}
+\newcommand*{\si@unt@spaceout}{%
+   \ensuremath{\si@unt@spstack}}
+\newcommand*{\si@unt@prefixout}{%
+  \ifnum\si@unt@prefixcnt=\z@\relax\else
+    \ifsi@unt@num
+      \si@out{\ensuremath{{}\si@prefixproduct{}}}%
+    \fi
+    \si@unt@stackvalsep
+    \let\si@expbase\si@prefixbase
+    \num{e\the\si@unt@prefixcnt}%
+  \fi}
+\newcommand*{\si@unt@normout}{%
+  \si@unt@prefixout
+  \si@unt@spaceout
+  \expandafter\si@unt@out\expandafter{\si@unt@stacka}}
+\newcommand*{\si@unt@fracout}{%
+  \si@unt@notambig
+  \ifx\@empty\si@unt@stacka\@empty
+    \ifx\@empty\si@unt@stackb\@empty
+      \ifsi@unt@litout\else
+        \si@log@err{Empty fractional unit}{The unit
+          argument\MessageBreak given does not contain any
+          symbols}%
+      \fi
+    \else
+      \ifsi@slash
+        \si@unt@prefixout
+        \si@frac{}{\si@unt@stackb}%
+      \else
+        \si@unt@prefixout
+        \si@unt@spaceout
+        \si@frac{1}{\si@unt@stackb}%
+      \fi
+    \fi
+  \else
+    \ifx\@empty\si@unt@stackb\@empty
+      \si@unt@normout
+    \else
+      \si@unt@prefixout
+      \si@unt@spaceout
+      \si@frac{\si@unt@stacka}{\si@unt@stackb}%
+    \fi
+  \fi}
+\newcommand*{\si@unt@notambig}{%
+  \ifnum\si@unt@unitcntb>\@ne\relax
+    \ifsi@slash
+        \ifsi@trapambigfrac
+          \expandafter\expandafter\expandafter\expandafter
+            \expandafter\expandafter\expandafter\si@unt@notabg
+        \fi
+    \fi
+  \fi}
+\newcommand*{\si@unt@notabg}{%
+  \protected@edef\si@unt@stackb{\si@openfrac\si@unt@stackb
+    \si@closefrac}}
+\begingroup
+  \catcode`\~=\active
+  \catcode`\.=\active
+  \gdef\si@unt@out#1{%
+    \begingroup
+      \si@unt@nonlatin
+      \makeatletter
+      \catcode`\~=\active
+      \catcode`\.=\active
+      \def~{\ensuremath{\si@unitspace}}%
+      \def.{\ensuremath{\si@unitsep}}%
+      \endlinechar\m@ne
+      \si@out{\scantokens{#1}}%
+    \endgroup}
+\endgroup
+\newcommand*{\si@unt@nonlatin}{}
+\ifdefined\XeTeXrevision
+  \renewcommand*{\si@unt@nonlatin}{%
+    \catcode176=\active
+    \catcode181=\active
+    \catcode197=\active
+    \si@unt@sym{176}{\si@sym@degree}%
+    \si@unt@sym{181}{\si@sym@mu}%
+    \si@unt@sym{197}{\si@sym@ringA}}%
+\fi
+\AtBeginDocument{
+  \@ifpackageloaded{inputenc}
+    {\@for\si@tempa:=latin1,latin5,latin9\do{
+       \ifx\inputencodingname\si@tempa
+         \renewcommand*{\si@unt@nonlatin}{%
+           \catcode176=\active
+           \catcode181=\active
+           \catcode197=\active
+           \si@unt@sym{176}{\si@sym@degree}%
+           \si@unt@sym{181}{\si@sym@mu}%
+           \si@unt@sym{197}{\si@sym@ringA}}%
+       \fi}}
+    {}}
+\newcommand*{\si@unt@sym}[1]{%
+  \bgroup
+    \uccode`\~#1%
+    \uppercase{%
+      \egroup
+      \def~}}
+\newunit{\kilogram}{kg}
+\newunit{\metre}{m}
+\newunit{\meter}{\metre}
+\newunit{\mole}{mol}
+\newunit{\second}{s}
+\newunit{\ampere}{A}
+\newunit{\kelvin}{K}
+\newunit{\candela}{cd}
+\newpower{\Square}{2}
+\newpower{\ssquare}{2}
+\newpower[post]{\squared}{2}
+\newpower{\cubic}{3}
+\newpower[post]{\cubed}{3}
+\newcommand*{\tothe}{\si@tothe{\tothe}}
+\newcommand*{\raiseto}{\si@tothe{\raiseto}}
+\newcommand*{\si@tothe}[2]{%
+  \ifsi@unt@littest
+    \expandafter\@gobbletwo
+  \else
+    \ifsi@unt@litout
+      \expandafter\expandafter\expandafter\si@unt@litpower
+    \else
+      \expandafter\expandafter\expandafter\si@unt@power
+    \fi
+  \fi
+  {#1}{#2}}
+\newcommand*{\tothe@opt@si}{post}
+\newcommand*{\raiseto@opt@si}{}
+\newcommand*{\si@loc@load}[1]{%
+  \let\si@loc@sisetup\sisetup
+  \renewcommand*{\sisetup}[1]{%
+    \expandafter\gdef\csname si@loc@#1\endcsname{##1}}
+  \si@loadfile{#1}%
+  \let\sisetup\si@loc@sisetup}
+\newcommand*{\si@loc@set}[1]{%
+  \ifcsname si@loc@#1\endcsname
+    \si@log@inf{Setting locale to `#1'}%
+    \expandafter\expandafter\expandafter\expandafter
+      \expandafter\expandafter\expandafter\si@temptoks
+      \expandafter\expandafter\expandafter\expandafter
+      \expandafter\expandafter\expandafter{%
+        \expandafter\csname si@loc@#1\endcsname}%
+    \expandafter\sisetup\expandafter{\the\si@temptoks}%
+    \ifcsname si@loc@#1@extra\endcsname
+      \csname si@loc@#1@extra\endcsname
+    \fi
+  \else
+    \ifcsname si@loc@#1@extra\endcsname
+      \si@log@inf{Setting locale to `#1'}%
+      \csname si@loc@#1@extra\endcsname
+    \else
+      \si@log@warn{Unknown locale `#1'}%
+    \fi
+  \fi}
+\newcommand*{\si@loc@ltol}[1]{%
+  \def\si@tempa##1:##2\@nil{\si@loc@load{##1}}
+  \@for\si@tempb:=#1\do{%
+    \expandafter\si@tempa\si@tempb:\@nil}
+  \AtBeginDocument{
+    \@ifpackageloaded{babel}
+      {\def\si@tempa##1:##2:##3\@nil{%
+        \expandafter\addto\expandafter{%
+          \csname extras##2\endcsname}%
+          {\si@loc@set{##1}}}%
+       \@for\si@tempb:=#1\do{%
+         \expandafter\si@tempa\si@tempb::\@nil}}
+      {\si@log@warn{babel not loaded \MessageBreak
+        loctolang option ignored}}}}
+\AtBeginDocument{
+  \@ifpackageloaded{babel}
+    {\renewcommand*{\si@loc@ltol}[1]{%
+       \def\si@tempa##1:##2\@nil{\si@loc@load{##1}}%
+       \@for\si@tempb:=#1\do{%
+         \expandafter\si@tempa\si@tempb:\@nil}%
+       \def\si@tempa##1:##2:##3\@nil{%
+         \expandafter\addto\expandafter{%
+           \csname extras##2\endcsname}%
+           {\si@loc@set{##1}}}%
+       \@for\si@tempb:=#1\do{%
+         \expandafter\si@tempa\si@tempb::\@nil}}}
+    {\renewcommand*{\si@loc@ltol}[1]{%
+       \si@log@warn{babel not loaded \MessageBreak
+         loctolang option ignored}}}}
+\newcommand*{\addtolocale}[2]{%
+  \si@addtocsname{si@loc@#1@extra}{#2}}
+\begingroup
+  \catcode`\^=\active\relax
+  \catcode`\-=\active\relax
+  \gdef\si@out#1{%
+    \begingroup
+      \catcode`\^=\active\relax
+      \makeatletter
+      \endlinechar\m@ne
+      \ifsi@fam@set\else
+        \expandafter\si@fam@set
+      \fi
+      \si@colourcmd{\si@colour}%
+      \text{\si@fam@italic\si@fam@bold\si@fam@text
+        \ifsi@textmode
+          \expandafter\si@out@text
+        \else
+          \expandafter\si@out@maths
+        \fi
+        {\scantokens{#1}}}%
+    \endgroup
+    \check@mathfonts}
+  \gdef\si@out@text#1{%
+    \let^\si@out@sp
+    \let\textsuperscript\si@out@sp
+    \catcode`\-=\active\relax
+    \let-\si@out@minus
+    #1}
+  \gdef\si@out@maths#1{%
+    \let^\sp
+    \let\textsuperscript\sp
+    $\si@fam@maths{#1}$}
+\endgroup
+\newcommand*{\si@out@sp}[1]{\ensuremath{^{\text{#1}}}}
+\newcommand*{\si@out@minus}{\ensuremath{-}}
+\newif\ifsi@out@num
+\newcommand*{\si@out@num}[1]{%
+  \begingroup
+    \si@out@numtrue
+    \si@out{#1}%
+  \endgroup}
+\newcommand*{\si@extension}{cfg}
+\newcommand*{\si@fileprefix}{si-}
+\newcommand*{\si@ifl@aded}{}
+\let\si@ifl@aded\@ifl@aded
+\newcommand*{\si@ifloaded}[1]{%
+  \si@ifl@aded\si@extension{\si@fileprefix#1}}
+\newcommand*{\si@loadfile}[1]{%
+  \si@ifloaded{#1}{}
+    {\InputIfFileExists{\si@fileprefix#1.\si@extension}
+      {}
+      {\si@log@err{Failed to load file
+         \si@fileprefix#1.\si@extension}
+         {The configuration file requested could not be
+          found}}}}
+\newcommand*{\requiresiconfigs}[1]{%
+  \@for\si@tempb:=#1\do{\si@loadfile{\si@tempb}}}
+\newcommand*{\si@loademfile}[1]{%
+  \@ifpackageloaded{#1}
+    {\si@log@err{Emulation clash for package `#1'}
+      {You have asked for emulation of package
+       `#1'\MessageBreak
+       (perhaps by giving siunitx a back-compatibility
+       option)\MessageBreak but the package is already
+       loaded!}}
+    {\si@loadfile{#1}}}
+\newcommand*{\si@emclash}[2]{%
+  \si@log@err{Emulation clash: `#1' and `#2'}
+    {You have asked for emulation of package `#1'\MessageBreak
+     but have already loaded emulation of `#2'}}
+\newcommand*{\si@emulating}[2]{%
+  \@namedef{ver@#1.sty}{#2 siunitx emulation of #1}%
+  \let\si@tempa\si@blockpkgs
+  \renewcommand*{\si@blockpkgs}{}%
+  \@for\si@tempb:=\si@tempa\do{%
+    \renewcommand*{\si@tempa}{#1}%
+    \ifx\si@tempa\si@tempb\else
+      \lowercase{\edef\si@tempa{#1}}%
+      \lowercase{\edef\si@tempc{\si@tempb}}%
+      \ifx\si@tempa\si@tempc
+        \@namedef{ver@\si@tempc.sty}{#2 siunitx emulation of
+          #1}%
+      \else
+        \si@addtolist{\si@blockpkgs}{\si@tempb}%
+      \fi
+    \fi}%
+  \let\si@tempa\si@checkpkgs
+  \renewcommand*{\si@checkpkgs}{}%
+  \renewcommand*{\si@tempb}{#1}%
+  \@for\si@tempc:=\si@tempa\do{%
+    \ifx\si@tempb\si@tempc\else
+      \si@addtolist{\si@checkpkgs}{\si@tempc}%
+    \fi}}
+\sisetup{
+  addsign=none,
+  allowzeroexp=false,
+  angformat=unchanged,
+  astroang=false,%(
+  closeerr=),%(
+  closefrac=),
+  colour=black,
+  colourall=false,
+  colourneg=false,
+  decimalsymbol=fullstop,
+  detectdisplay=true,
+  digitsep=thin,
+  dp=3,
+  eVcorra=0.3ex,
+  eVcorrb=0ex,
+  errspace=none,
+  fixdp=false,
+  inlinebold=text,
+  load=default,
+  mathsrm=mathrm,
+  mathssf=mathsf,
+  mathstt=mathtt,
+  mode=maths,
+  negcolour=red,
+  noload={},
+  numaddn={},%(
+  numcloseerr=),%
+  numdecimal={.,},
+  numdigits=0123456789,
+  numexp=eEdD,
+  numgobble={},
+  numopenerr=(,%)
+  numprod=x,
+  numsign=+-\pm\mp,
+  obeybold=false,
+  obeyitalic=false,
+  obeymode=false,
+  openerr=(,%)
+  openfrac=(,%)
+  padangle=small,
+  padnumber=lead,
+  per=reciprocal,
+  prefixbase=ten,
+  prefixproduct=times,
+  prefixsymbolic=true,
+  prespace=false,
+  redefsymbols=true,
+  repeatunits=true,
+  retainplus=false,
+  seperr=false,
+  sepfour=false,
+  sign=plus,
+  slash=slash,
+  stickyper=false,
+  strictarc=true,
+  tabalignexp=true,
+  tabautofit=false,
+  tabformat=3.2,
+  tabnumalign=centredecimal,
+  tabtextalign=centre,
+  tabunitalign=left,
+  textrm=rmfamily,
+  textsf=sffamily,
+  texttt=ttfamily,
+  tightpm=false,
+  trapambigerr=true,
+  trapambigfrac=true,
+  unitsep=thin,
+  valuesep=thin,
+  xspace=false}
+\ProcessOptionsX[si]<key>
+\ifx\@empty\si@emulate\@empty\else
+  \@for\si@tempa:=\si@emulate\do{%
+    \si@loademfile{\si@tempa}}
+\fi
+\newcommand*{\si@expanddefault}[2]{%
+  \expandafter\ifx\expandafter\@empty\csname si@#1\endcsname
+    \@empty
+  \else
+    \renewcommand*{\si@tempb}{default}%
+    \renewcommand*{\si@tempc}{}%
+    \expandafter\@for\expandafter\si@tempa\expandafter
+      :\expandafter=\csname si@#1\endcsname\do{%
+      \ifx\si@tempa\si@tempb
+        \si@addtolist{\si@tempc}{#2}%
+      \else
+        \si@addtolist{\si@tempc}{\si@tempa}%
+      \fi}
+    \expandafter\edef\csname si@#1\endcsname{\si@tempc}%
+    \expandafter\si@addtolist\expandafter{%
+      \csname si@no#1\endcsname}%
+      {default}%
+    \renewcommand*{\si@tempc}{}%
+    \expandafter\@for\expandafter\si@tempa\expandafter
+      :\expandafter=\csname si@#1\endcsname\do{%
+      \si@switchfalse
+      \expandafter\@for\expandafter\si@tempb\expandafter
+        :\expandafter=\csname si@no#1\endcsname\do{%
+        \ifx\si@tempa\si@tempb
+          \si@switchtrue
+        \fi
+        \ifsi@switch\else
+          \si@addtolist{\si@tempc}{\si@tempa}%
+        \fi}}
+    \@for\si@tempa:=\si@tempc\do{%
+      \si@loadfile{\si@tempa}}%
+  \fi}
+\si@expanddefault{load}{prefix,named,addn,prefixed,accepted,%
+  physical,abbr}
+\IfFileExists{siunitx.cfg}
+  {\si@log@inf{Local configuration file found}%
+   \InputIfFileExists{siunitx.cfg}{}{}}
+  {}
+\si@catcodes
+\endinput
+%%
+%% End of file `siunitx.sty'.