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+% \iffalse meta-comment
+%
+% File: chemarr.dtx
+% Version: 2016/05/16 v1.3
+% Info: Arrows for chemical reactions
+%
+% Copyright (C) 2001, 2006 by
+% Heiko Oberdiek <heiko.oberdiek at googlemail.com>
+% 2016
+% https://github.com/ho-tex/oberdiek/issues
+%
+% 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. This version of this license is in
+% http://www.latex-project.org/lppl/lppl-1-3c.txt
+% and the latest version of this license is in
+% http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of
+% LaTeX version 2005/12/01 or later.
+%
+% This work has the LPPL maintenance status "maintained".
+%
+% This Current Maintainer of this work is Heiko Oberdiek.
+%
+% This work consists of the main source file chemarr.dtx
+% and the derived files
+% chemarr.sty, chemarr.pdf, chemarr.ins, chemarr.drv,
+% chemarr-example.tex.
+%
+% Distribution:
+% CTAN:macros/latex/contrib/oberdiek/chemarr.dtx
+% CTAN:macros/latex/contrib/oberdiek/chemarr.pdf
+%
+% Unpacking:
+% (a) If chemarr.ins is present:
+% tex chemarr.ins
+% (b) Without chemarr.ins:
+% tex chemarr.dtx
+% (c) If you insist on using LaTeX
+% latex \let\install=y\input{chemarr.dtx}
+% (quote the arguments according to the demands of your shell)
+%
+% Documentation:
+% (a) If chemarr.drv is present:
+% latex chemarr.drv
+% (b) Without chemarr.drv:
+% latex chemarr.dtx; ...
+% The class ltxdoc loads the configuration file ltxdoc.cfg
+% if available. Here you can specify further options, e.g.
+% use A4 as paper format:
+% \PassOptionsToClass{a4paper}{article}
+%
+% Programm calls to get the documentation (example):
+% pdflatex chemarr.dtx
+% makeindex -s gind.ist chemarr.idx
+% pdflatex chemarr.dtx
+% makeindex -s gind.ist chemarr.idx
+% pdflatex chemarr.dtx
+%
+% Installation:
+% TDS:tex/latex/oberdiek/chemarr.sty
+% TDS:doc/latex/oberdiek/chemarr.pdf
+% TDS:doc/latex/oberdiek/chemarr-example.tex
+% TDS:source/latex/oberdiek/chemarr.dtx
+%
+%<*ignore>
+\begingroup
+ \catcode123=1 %
+ \catcode125=2 %
+ \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
+\Msg{************************************************************************}
+\Msg{* Installation}
+\Msg{* Package: chemarr 2016/05/16 v1.3 Arrows for chemical reactions (HO)}
+\Msg{************************************************************************}
+
+\keepsilent
+\askforoverwritefalse
+
+\let\MetaPrefix\relax
+\preamble
+
+This is a generated file.
+
+Project: chemarr
+Version: 2016/05/16 v1.3
+
+Copyright (C) 2001, 2006 by
+ Heiko Oberdiek <heiko.oberdiek at googlemail.com>
+
+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. This version of this license is in
+ http://www.latex-project.org/lppl/lppl-1-3c.txt
+and the latest version of this license is in
+ http://www.latex-project.org/lppl.txt
+and version 1.3 or later is part of all distributions of
+LaTeX version 2005/12/01 or later.
+
+This work has the LPPL maintenance status "maintained".
+
+This Current Maintainer of this work is Heiko Oberdiek.
+
+This work consists of the main source file chemarr.dtx
+and the derived files
+ chemarr.sty, chemarr.pdf, chemarr.ins, chemarr.drv,
+ chemarr-example.tex.
+
+\endpreamble
+\let\MetaPrefix\DoubleperCent
+
+\generate{%
+ \file{chemarr.ins}{\from{chemarr.dtx}{install}}%
+ \file{chemarr.drv}{\from{chemarr.dtx}{driver}}%
+ \usedir{tex/latex/oberdiek}%
+ \file{chemarr.sty}{\from{chemarr.dtx}{package}}%
+ \usedir{doc/latex/oberdiek}%
+ \file{chemarr-example.tex}{\from{chemarr.dtx}{example}}%
+ \nopreamble
+ \nopostamble
+% \usedir{source/latex/oberdiek/catalogue}%
+% \file{chemarr.xml}{\from{chemarr.dtx}{catalogue}}%
+}
+
+\catcode32=13\relax% active space
+\let =\space%
+\Msg{************************************************************************}
+\Msg{*}
+\Msg{* To finish the installation you have to move the following}
+\Msg{* file into a directory searched by TeX:}
+\Msg{*}
+\Msg{* chemarr.sty}
+\Msg{*}
+\Msg{* To produce the documentation run the file `chemarr.drv'}
+\Msg{* through LaTeX.}
+\Msg{*}
+\Msg{* Happy TeXing!}
+\Msg{*}
+\Msg{************************************************************************}
+
+\endbatchfile
+%</install>
+%<*ignore>
+\fi
+%</ignore>
+%<*driver>
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesFile{chemarr.drv}%
+ [2016/05/16 v1.3 Arrows for chemical reactions (HO)]%
+\documentclass{ltxdoc}
+\usepackage{chemarr}[2016/05/16]
+\usepackage{holtxdoc}[2011/11/22]
+\begin{document}
+ \DocInput{chemarr.dtx}%
+\end{document}
+%</driver>
+% \fi
+%
+%
+% \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{chemarr.drv}
+%
+% \title{The \xpackage{chemarr} package}
+% \date{2016/05/16 v1.3}
+% \author{Heiko Oberdiek\thanks
+% {Please report any issues at https://github.com/ho-tex/oberdiek/issues}\\
+% \xemail{heiko.oberdiek at googlemail.com}}
+%
+% \maketitle
+%
+% \begin{abstract}
+% Very often chemists need a longer version
+% of reaction arrows (\cs{rightleftharpoons}) with
+% the possibility to put text above and below.
+% Analogous to \xpackage{amsmath}'s \cs{xrightarrow} and
+% \cs{xleftarrow} this package provides the macro
+% \cs{xrightleftharpoons}.
+% \end{abstract}
+%
+% \tableofcontents
+%
+% \section{Usage}
+%
+% \DescribeMacro{\xrightleftharpoons}
+% This \LaTeX\ package defines \cs{xrightleftharpoons}. It prints
+% extensible arrows (harpoons), usually used in chemical reactions.
+% It allows to put some text above and below the harpoons and can
+% be used inside and outside of math mode.
+%
+% The package is based on \xpackage{amsmath}, thus it loads it,
+% if necessary.
+%
+% \subsection{Example}
+%
+% \begin{macrocode}
+%<*example>
+\documentclass{article}
+\usepackage{chemarr}
+\begin{document}
+\begin{center}
+ left
+ \xrightleftharpoons[\text{below}]{\text{above}}
+ right
+\end{center}
+\[
+ A
+ \xrightleftharpoons[T \geq 400\,\mathrm{K}]{p > 10\,\mathrm{hPa}}
+ B
+\]
+\end{document}
+%</example>
+% \end{macrocode}
+% The result:
+% \begin{center}
+% left
+% \xrightleftharpoons[\text{below}]{\text{above}}
+% right
+% \end{center}
+% \[
+% A
+% \xrightleftharpoons[T \geq 400\,\mathrm{K}]{p > 10\,\mathrm{hPa}}
+% B
+% \]
+%
+% \StopEventually{
+% }
+%
+% \section{Implementation}
+%
+% \begin{macrocode}
+%<*package>
+% \end{macrocode}
+% Package identification.
+% \begin{macrocode}
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{chemarr}%
+ [2016/05/16 v1.3 Arrows for chemical reactions (HO)]
+% \end{macrocode}
+%
+% \begin{macrocode}
+\RequirePackage{amsmath}
+% \end{macrocode}
+% The package \xpackage{amsmath} is needed for the following commands:
+% \begin{quote}
+% \cs{ext@arrow}, \cs{@ifnotempty}, \cs{arrowfill@}\\
+% \cs{relbar}, \cs{std@minus}\\
+% \cs{@ifempty}, \cs{@xifempty}, \cs{@xp}
+% \end{quote}
+%
+% \begin{macro}{\xrightleftharpoons}
+% In \xfile{fontmath.ltx} \cs{rightleftharpoons} is defined with
+% a vertical space of 2pt.
+% \begin{macrocode}
+\newcommand{\xrightleftharpoons}[2][]{%
+ \ensuremath{%
+ \mathrel{%
+ \settoheight{\dimen@}{\raise 2pt\hbox{$\rightharpoonup$}}%
+ \setlength{\dimen@}{-\dimen@}%
+ \edef\CA@temp{\the\dimen@}%
+ \settoheight\dimen@{$\rightleftharpoons$}%
+ \addtolength{\dimen@}{\CA@temp}%
+ \raisebox{\dimen@}{%
+ \rlap{%
+ \raisebox{2pt}{%
+ $%
+ \ext@arrow 0359\rightharpoonupfill@{\hphantom{#1}}{#2}%
+ $%
+ }%
+ }%
+ \hbox{%
+ $%
+ \ext@arrow 3095\leftharpoondownfill@{#1}{\hphantom{#2}}%
+ $%
+ }%
+ }%
+ }%
+ }%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\leftharpoondownfill@}
+% \begin{macrocode}
+\newcommand*{\leftharpoondownfill@}{%
+ \arrowfill@\leftharpoondown\relbar\relbar
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\rightharpoonupfill@}
+% \begin{macrocode}
+\newcommand*{\rightharpoonupfill@}{%
+ \arrowfill@\relbar\relbar\rightharpoonup
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macrocode}
+%</package>
+% \end{macrocode}
+%
+% \section{Installation}
+%
+% \subsection{Download}
+%
+% \paragraph{Package.} This package is available on
+% CTAN\footnote{\url{http://ctan.org/pkg/chemarr}}:
+% \begin{description}
+% \item[\CTAN{macros/latex/contrib/oberdiek/chemarr.dtx}] The source file.
+% \item[\CTAN{macros/latex/contrib/oberdiek/chemarr.pdf}] Documentation.
+% \end{description}
+%
+%
+% \paragraph{Bundle.} All the packages of the bundle `oberdiek'
+% are also available in a TDS compliant ZIP archive. There
+% the packages are already unpacked and the documentation files
+% are generated. The files and directories obey the TDS standard.
+% \begin{description}
+% \item[\CTAN{install/macros/latex/contrib/oberdiek.tds.zip}]
+% \end{description}
+% \emph{TDS} refers to the standard ``A Directory Structure
+% for \TeX\ Files'' (\CTAN{tds/tds.pdf}). Directories
+% with \xfile{texmf} in their name are usually organized this way.
+%
+% \subsection{Bundle installation}
+%
+% \paragraph{Unpacking.} Unpack the \xfile{oberdiek.tds.zip} in the
+% TDS tree (also known as \xfile{texmf} tree) of your choice.
+% Example (linux):
+% \begin{quote}
+% |unzip oberdiek.tds.zip -d ~/texmf|
+% \end{quote}
+%
+% \paragraph{Script installation.}
+% Check the directory \xfile{TDS:scripts/oberdiek/} for
+% scripts that need further installation steps.
+% Package \xpackage{attachfile2} comes with the Perl script
+% \xfile{pdfatfi.pl} that should be installed in such a way
+% that it can be called as \texttt{pdfatfi}.
+% Example (linux):
+% \begin{quote}
+% |chmod +x scripts/oberdiek/pdfatfi.pl|\\
+% |cp scripts/oberdiek/pdfatfi.pl /usr/local/bin/|
+% \end{quote}
+%
+% \subsection{Package installation}
+%
+% \paragraph{Unpacking.} The \xfile{.dtx} file is a self-extracting
+% \docstrip\ archive. The files are extracted by running the
+% \xfile{.dtx} through \plainTeX:
+% \begin{quote}
+% \verb|tex chemarr.dtx|
+% \end{quote}
+%
+% \paragraph{TDS.} Now the different files must be moved into
+% the different directories in your installation TDS tree
+% (also known as \xfile{texmf} tree):
+% \begin{quote}
+% \def\t{^^A
+% \begin{tabular}{@{}>{\ttfamily}l@{ $\rightarrow$ }>{\ttfamily}l@{}}
+% chemarr.sty & tex/latex/oberdiek/chemarr.sty\\
+% chemarr.pdf & doc/latex/oberdiek/chemarr.pdf\\
+% chemarr-example.tex & doc/latex/oberdiek/chemarr-example.tex\\
+% chemarr.dtx & source/latex/oberdiek/chemarr.dtx\\
+% \end{tabular}^^A
+% }^^A
+% \sbox0{\t}^^A
+% \ifdim\wd0>\linewidth
+% \begingroup
+% \advance\linewidth by\leftmargin
+% \advance\linewidth by\rightmargin
+% \edef\x{\endgroup
+% \def\noexpand\lw{\the\linewidth}^^A
+% }\x
+% \def\lwbox{^^A
+% \leavevmode
+% \hbox to \linewidth{^^A
+% \kern-\leftmargin\relax
+% \hss
+% \usebox0
+% \hss
+% \kern-\rightmargin\relax
+% }^^A
+% }^^A
+% \ifdim\wd0>\lw
+% \sbox0{\small\t}^^A
+% \ifdim\wd0>\linewidth
+% \ifdim\wd0>\lw
+% \sbox0{\footnotesize\t}^^A
+% \ifdim\wd0>\linewidth
+% \ifdim\wd0>\lw
+% \sbox0{\scriptsize\t}^^A
+% \ifdim\wd0>\linewidth
+% \ifdim\wd0>\lw
+% \sbox0{\tiny\t}^^A
+% \ifdim\wd0>\linewidth
+% \lwbox
+% \else
+% \usebox0
+% \fi
+% \else
+% \lwbox
+% \fi
+% \else
+% \usebox0
+% \fi
+% \else
+% \lwbox
+% \fi
+% \else
+% \usebox0
+% \fi
+% \else
+% \lwbox
+% \fi
+% \else
+% \usebox0
+% \fi
+% \else
+% \lwbox
+% \fi
+% \else
+% \usebox0
+% \fi
+% \end{quote}
+% If you have a \xfile{docstrip.cfg} that configures and enables \docstrip's
+% TDS installing feature, then some files can already be in the right
+% place, see the documentation of \docstrip.
+%
+% \subsection{Refresh file name databases}
+%
+% If your \TeX~distribution
+% (\teTeX, \mikTeX, \dots) relies on file name databases, you must refresh
+% these. For example, \teTeX\ users run \verb|texhash| or
+% \verb|mktexlsr|.
+%
+% \subsection{Some details for the interested}
+%
+% \paragraph{Attached source.}
+%
+% The PDF documentation on CTAN also includes the
+% \xfile{.dtx} source file. It can be extracted by
+% AcrobatReader 6 or higher. Another option is \textsf{pdftk},
+% e.g. unpack the file into the current directory:
+% \begin{quote}
+% \verb|pdftk chemarr.pdf unpack_files output .|
+% \end{quote}
+%
+% \paragraph{Unpacking with \LaTeX.}
+% The \xfile{.dtx} chooses its action depending on the format:
+% \begin{description}
+% \item[\plainTeX:] Run \docstrip\ and extract the files.
+% \item[\LaTeX:] Generate the documentation.
+% \end{description}
+% If you insist on using \LaTeX\ for \docstrip\ (really,
+% \docstrip\ does not need \LaTeX), then inform the autodetect routine
+% about your intention:
+% \begin{quote}
+% \verb|latex \let\install=y\input{chemarr.dtx}|
+% \end{quote}
+% Do not forget to quote the argument according to the demands
+% of your shell.
+%
+% \paragraph{Generating the documentation.}
+% You can use both the \xfile{.dtx} or the \xfile{.drv} to generate
+% the documentation. The process can be configured by the
+% configuration file \xfile{ltxdoc.cfg}. For instance, put this
+% line into this file, if you want to have A4 as paper format:
+% \begin{quote}
+% \verb|\PassOptionsToClass{a4paper}{article}|
+% \end{quote}
+% An example follows how to generate the
+% documentation with pdf\LaTeX:
+% \begin{quote}
+%\begin{verbatim}
+%pdflatex chemarr.dtx
+%makeindex -s gind.ist chemarr.idx
+%pdflatex chemarr.dtx
+%makeindex -s gind.ist chemarr.idx
+%pdflatex chemarr.dtx
+%\end{verbatim}
+% \end{quote}
+%
+% \section{Catalogue}
+%
+% The following XML file can be used as source for the
+% \href{http://mirror.ctan.org/help/Catalogue/catalogue.html}{\TeX\ Catalogue}.
+% The elements \texttt{caption} and \texttt{description} are imported
+% from the original XML file from the Catalogue.
+% The name of the XML file in the Catalogue is \xfile{chemarr.xml}.
+% \begin{macrocode}
+%<*catalogue>
+<?xml version='1.0' encoding='us-ascii'?>
+<!DOCTYPE entry SYSTEM 'catalogue.dtd'>
+<entry datestamp='$Date$' modifier='$Author$' id='chemarr'>
+ <name>chemarr</name>
+ <caption>Arrows for chemists.</caption>
+ <authorref id='auth:oberdiek'/>
+ <copyright owner='Heiko Oberdiek' year='2001,2006'/>
+ <license type='lppl1.3'/>
+ <version number='1.3'/>
+ <description>
+ Very often chemists need a longer version of reaction arrows
+ (<tt>\rightleftharpoons</tt>) with the possibility to put text
+ above and below. Analogous to <xref refid='amsmath'>amsmath</xref>'s
+ <tt>\xrightarrow</tt> and <tt>\xleftarrow</tt> this package
+ provides the macro <tt>\xrightleftharpoons</tt>. The package
+ requires amsmath. To use it, <tt>\usepackage{chemarr}</tt>,
+ then <tt>\xrightleftharpoons[below]{above}</tt> .
+ <p/>
+ The package is part of the <xref refid='oberdiek'>oberdiek</xref>
+ bundle.
+ </description>
+ <documentation details='Package documentation'
+ href='ctan:/macros/latex/contrib/oberdiek/chemarr.pdf'/>
+ <ctan file='true' path='/macros/latex/contrib/oberdiek/chemarr.dtx'/>
+ <miktex location='oberdiek'/>
+ <texlive location='oberdiek'/>
+ <install path='/macros/latex/contrib/oberdiek/oberdiek.tds.zip'/>
+</entry>
+%</catalogue>
+% \end{macrocode}
+%
+% \begin{History}
+% \begin{Version}{2001/06/21 v1.0}
+% \item
+% First public version.
+% \end{Version}
+% \begin{Version}{2001/06/22 v1.1}
+% \item
+% Documentation fixes.
+% \end{Version}
+% \begin{Version}{2006/02/20 v1.2}
+% \item
+% DTX framework.
+% \item
+% Example added.
+% \end{Version}
+% \begin{Version}{2016/05/16 v1.3}
+% \item
+% Documentation updates.
+% \end{Version}
+% \end{History}
+%
+% \PrintIndex
+%
+% \Finale
+\endinput