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+% SECTION.STY
+% (c) (1992-1994) Oliver Pretzel (o.pretzel@ic.ac.uk)
+% Created 29 Oct 94 version 1.4: 10 Mar 99.
+% For use with Latex Standard Styles
+% Adds control of section heading style to standard LaTeX.
+% For LaTeX2.09 (OFSS and NFSS) and LaTeX2e.
+%
+% Optional features are set to standard.
+%
+% DOCUMENTATION at end of file
+%
+% WARNING: conflicts with REFMAN.STY.
+%
+% ALL RIGHTS RESERVED
+%
+% This file may be distributed freely.
+% It may be modified for local use (please inform me of such modifications)
+% Modified versions may only be distributed if
+% 1. The name is changed
+% 2. A statement acknowledging the modification heads the file.
+%
+% DO NOT USE \neq in this file
+\chardef\neq\the\catcode`\@
+\makeatletter\@makeother\"
+%
+\typeout{`section.sty' <1.4>}
+%*************************
+\ifx\reset@font\undefined\let\reset@font\relax\fi
+%
+% Options
+%
+\ifx\secindent\undefined
+ \newdimen\secindent
+ \newskip\secpreskp
+ \newskip\secpstskp
+ \newdimen\subindent
+ \newskip\subpreskp
+ \newskip\subpstskp
+ \newskip\parpstskp
+ \newcount\c@hddepth
+\fi
+%implict multiplication removes stretch
+\secindent0pt% no indentation
+\secpreskp1.2\baselineskip plus .35\baselineskip minus.07\baselineskip
+%\secpreskp3.5ex plus 1 ex minus.2ex
+\secpreskp-\secpreskp
+\secpstskp.8\baselineskip plus .07\baselineskip
+%\secpstskp2.3ex plus .2ex
+\subindent0pt
+\subpreskp1.13\baselineskip plus .35\baselineskip minus.07\baselineskip
+%\subpreskp3.25ex plus 1 ex minus.2ex
+\subpreskp-\subpreskp
+\subpstskp.53\baselineskip plus.07\baselineskip
+%\subpstskp1.5ex plus.2ex
+\parpstskp-.8\baselineskip
+%\parpstskp-1em
+\ifx\chapter\undefined
+ \def\chsize{\Large}\def\hdsize{\huge}\else
+ \def\chsize{\huge}\def\hdsize{\Huge}
+\fi
+\let\ttsize\LARGE
+\let\ausize\large
+\let\dasize\large
+\let\hdpos\raggedright
+\c@hddepth\z@
+\let\secsize\Large
+\let\subsize\large
+\let\fpind\relax
+%
+\def\nmdot{}
+\def\cpdot{:}
+\def\hdfnt{\reset@font\bf}
+\def\ttfnt{\reset@font\rm}
+\def\pgfnt{\reset@font\rm}
+\def\mkfnt{\reset@font\sl}
+\let\mkcse\uppercase
+\def\hddot{}
+\def\fefnt{\reset@font\bf}
+\def\thfnt{\reset@font\it}
+%
+\def\fnum@figure{\figurename~\thefigure\cpdot}
+\def\fnum@table{\tablename~\thetable\cpdot}
+%
+%
+% theorems
+%
+\def\@begintheorem#1#2{%
+ \trivlist \item[\hskip \labelsep{\fefnt #1\ #2\hddot}]\thfnt}
+\def\@opargbegintheorem#1#2#3{\trivlist
+ \item[\hskip \labelsep{\fefnt #1\ #2\ (#3)\hddot}]\thfnt}
+%
+{\@makeother\~
+\long\gdef\@ifempty#1#2#3{\if~#1~#2\else#3\fi}
+}
+\long\def\@gobifnul#1#2{\@ifempty{#1}\@empty{#1#2}}
+%\@Alph and \@alph \relax added to allow \@ifempty test when counter<=0
+\def\@alph#1{%
+ \ifcase#1\or a\or b\or c\or d\or e\or f\or g\or h\or i\or j\or
+ k\or l\or m\or n\or o\or p\or q\or r\or s\or t\or u\or v\or w\or x\or
+ y\or z\else\@ctrerr\fi\relax}
+\def\@Alph#1{%
+ \ifcase#1\or A\or B\or C\or D\or E\or F\or G\or H\or I\or J\or
+ K\or L\or M\or N\or O\or P\or Q\or R\or S\or T\or U\or V\or W\or X\or
+ Y\or Z\else\@ctrerr\fi\relax}
+%LaTeX 209
+\ifx\@ialph\undefined\else\let\@ialph\undefined\let\@Ialph\undefined\fi
+%
+% Figures and Tables
+%
+\long\def\@makecaption#1#2{\vskip 10\p@
+ \setbox\@tempboxa\hbox{#1\ #2}\ifdim \wd\@tempboxa >\hsize
+ #1\ #2\par\else\hbox to\hsize{\hfil\box\@tempboxa\hfil}\fi}
+%
+% Modified LateX Sectioning Commands
+%
+\ifx\chapter\undefined
+%
+%Article
+%
+\def\part{\par\vskip1.4\baselineskip\@tempskipa\z@
+ \@tempskipb\baselineskip\@afterindentfalse\secdef\@part\@spart}
+\def\@part[#1]#2{\ifnum \c@secnumdepth >\m@ne\@makesecdot{part}%
+ \addcontentsline{toc}{part}{\protect\numberline{\thepart\nmdot}{#1}}\else
+ \addcontentsline{toc}{part}{#1}\fi\@mkboth{}{}
+ {\parindent\z@\hdpos\interlinepenalty\@M\ifnum\c@secnumdepth>\m@ne
+ \@ifempty\thepart\@empty{\chsize\hdfnt\partname~\thepart\par\nobreak
+ \vskip\@tempskipa}\fi}\@spart{#2}}
+\def\@spart#1{\@ifempty{#1}\removelastskip{\parindent\z@\hdpos
+ \interlinepenalty\@M\hdsize\hdfnt#1\par}\nobreak\vskip\@tempskipb
+ \fpind\@afterheading}
+\def\maketitle{\par\begingroup\def\thefootnote{\fnsymbol{footnote}}%
+ \def\@makefnmark{\hbox to\z@{$\m@th^{\@thefnmark}$\hss}}%
+ \if@twocolumn\twocolumn[\@maketitle]%
+ \else\newpage\global\@topnum\z@\@maketitle\fi
+ \thispagestyle{empty}\@thanks\endgroup
+ \setcounter{footnote}{0}\let\maketitle\relax\let\@maketitle\relax
+ \def\@thanks{}\def\@author{}\def\@title{}\let\thanks\relax}
+\def\@maketitle{\null \vskip \tw@ em\begin{center}%
+ {\ttsize\ttfnt\@title\par}\vskip1.2\baselineskip{\ausize\ttfnt%1.5em
+ \lineskip.4\baselineskip\begin{tabular}[t]{c}\@author\end{tabular}\par}%.5em
+ \vskip.8\baselineskip{\dasize\ttfnt\@date}\end{center}% 1em
+ \par\vskip1.2\baselineskip}% 1.5em
+\if@twoside
+ \def\ps@headings{\let\@mkboth\markboth
+ \def\@oddfoot{}\def\@evenfoot{}
+ \def\@evenhead{\pgfnt\thepage\hfil\mkfnt\leftmark}%
+ \def\@oddhead{\mkfnt\rightmark\hfil\pgfnt\thepage}%
+ \def\sectionmark##1{\markboth{\mkcse{\ifnum\c@secnumdepth>\z@\@gobifnul
+ \thesection{\@ifempty{##1}\@empty{\nmdot\quad}}\fi##1}}{}}%
+ \def\subsectionmark##1{\markright{\ifnum\c@secnumdepth>\@ne\@gobifnul
+ \thesubsection{\@ifempty{##1}\@empty{\nmdot\quad}}\fi##1}}}
+\else
+ \def\ps@headings{\let\@mkboth\markboth
+ \def\@oddfoot{}\def\@evenfoot{}
+ \def\@oddhead{\mkfnt\rightmark\hfil\pgfnt\thepage}%
+ \def\sectionmark##1{\markright{\mkcse{\ifnum\c@secnumdepth>\z@
+ \@gobifnul\thesection{\@ifempty{##1}\@empty{\nmdot\quad}}\fi##1}}}}
+\fi
+\def\ps@myheadings{\let\@mkboth\@gobbletwo
+ \def\@oddhead{\mkfnt\rightmark \hfil\pgfnt\thepage}\def\@oddfoot{}%
+ \def\@evenhead{\pgfnt\thepage\hfil\mkfnt\leftmark}\def\@evenfoot{}%
+ \def\sectionmark##1{}\def\subsectionmark##1{}}
+\def\tableofcontents{\makeheading{\contentsname
+ \@mkboth{\mkcse{\contentsname}}{\mkcse{\contentsname}}}%
+ \@starttoc{toc}}
+\def\listoffigures{\makeheading{\listfigurename
+ \@mkboth{\mkcse{\listfigurename}}{\mkcse{\listfigurename}}}%
+ \@starttoc{lof}}
+\def\listoftables{\makeheading{\listtablename\@mkboth
+ {\mkcse{\listtablename}}{\mkcse{\listtablename}}}%
+ \@starttoc{lot}}
+\def\thebibliography#1{\makeheading{\refname\@mkboth
+ {\mkcse{\refname}}{\mkcse{\refname}}}\list
+ {\@biblabel{\arabic{enumiv}}}{\settowidth\labelwidth{\@biblabel{#1}}%
+ \leftmargin\labelwidth\advance\leftmargin\labelsep
+ \usecounter{enumiv}\let\p@enumiv\@empty
+ \def\theenumiv{\arabic{enumiv}}}%
+ \def\newblock{\hskip .11em plus.33em minus.07em}%
+ \sloppy\clubpenalty4000\widowpenalty4000\sfcode`\.=\@m\relax}
+\def\theindex{\@restonecoltrue\if@twocolumn\@restonecolfalse\fi
+ \columnseprule \z@\columnsep 35\p@\twocolumn[\makeheading{\indexname}]%
+ \@mkboth{\mkcse{\indexname}}{\mkcse{\indexname}}%
+ \thispagestyle{plain}\parindent\z@
+ \parskip\z@ plus.3\p@\relax\let\item\@idxitem}
+\def\l@part{\@tocheadline{0}{1.8\baselineskip}{3em}{\large\bf}}%2.25em
+\def\l@section{\@tocheadline{1}{1em}{1.8em}{\bf}}
+\def\makeheading{\section*}
+\else
+%
+%Report/Book
+%
+\def\part{\cleardoublepage\thispagestyle{plain}%
+ \if@twocolumn\onecolumn\@tempswatrue\else \@tempswafalse\fi
+ \@tempskipa20\p@\@tempskipb\fill\hbox{}\vfil\secdef\@part\@spart}
+\def\@part[#1]#2{\ifnum\c@secnumdepth>-2\@makesecdot{part}%
+ \addcontentsline{toc}{part}{\protect\numberline{\thepart\nmdot}#1}\else
+ \addcontentsline{toc}{part}{#1}\fi\@mkboth{}{}%
+ {\parindent\z@\hdpos\ifnum\c@secnumdepth>-2\@ifempty\thepart\@empty
+ {\chsize\hdfnt\partname~\thepart\par\vskip\@tempskipa}\fi
+ \@spart{#2}}}
+\def\@spart#1{\@ifempty{#1}\removelastskip{\hdpos\hdsize\hdfnt#1\par}%
+ \vskip\@tempskipb\newpage\if@twoside\hbox{}\thispagestyle{empty}\newpage\fi
+ \if@tempswa\twocolumn\fi}
+\let\@endpart\undefined
+\def\@makeschapterhead#1#2#3#4{\vskip#2{\parindent\z@\hdpos
+ \if@nobreak\ifnum\c@secnumdepth>\m@ne\@ifempty\thechapter\@empty
+ {\chsize\hdfnt\@chapapp~\thechapter \par\nobreak\vskip#3}\fi\fi
+ \@ifempty{#1}\removelastkip{\hdsize\hdfnt#1\par}\nobreak\vskip#4}}
+\def\@makechapterhead#1{\hbox{}\@makeschapterhead{#1}{50\p@}{20\p@}{40\p@}}
+\def\@chapter[#1]#2{\ifnum\c@secnumdepth>\m@ne\@makesecdot{chapter}%
+\typeout{\@chapapp\space\thechapter}\fi\@contmark{chapter}\z@{#1}%
+ \addtocontents{lof}{\protect\addvspace{10\p@}}%
+ \addtocontents{lot}{\protect\addvspace{10\p@}}\@nobreaktrue
+ \if@twocolumn\@topnewpage[\@makechapterhead{#2}]\else\@makechapterhead{#2}\fi
+ \fpind\@afterheading}
+\def\@schapter#1{\@nobreakfalse\if@twocolumn
+ \@topnewpage[\@makechapterhead{#1}]\else
+ \@makechapterhead{#1}\fi\fpind\@afterheading}
+\if@twoside
+ \def\ps@headings{\let\@mkboth\markboth\def\@oddfoot{}\def\@evenfoot{}%
+ \def\@evenhead{\pgfnt\thepage\hfil\mkfnt\leftmark}%
+ \def\@oddhead{\hbox{}\mkfnt\rightmark\hfil\pgfnt\thepage}%
+ \def\chaptermark##1{\markboth{\mkcse{\ifnum
+ \c@secnumdepth>\m@ne\expandafter\@gobifnul\@chapapp\ \@gobifnul
+ \thechapter{\@ifempty{##1}\@empty{\nmdot\quad}}\fi##1}}{}}%
+ \def\sectionmark##1{\markright{\mkcse{\ifnum \c@secnumdepth >\z@\@gobifnul
+ \thesection{\@ifempty{##1}\@empty{\nmdot\quad}}\fi ##1}}}}
+\else
+ \def\ps@headings{\let\@mkboth\markboth
+ \def\@oddfoot{}\def\@evenfoot{}%
+ \def\@oddhead{\mkfnt \rightmark \hfil\pgfnt\thepage}%
+ \def\chaptermark##1{\markright {\mkcse{\ifnum
+ \c@secnumdepth>\m@ne \expandafter\@gobifnul\@chapapp\ \@gobifnul
+ \thechapter{\@ifempty{##1}\@empty{\nmdot\quad}}\fi##1}}}}
+\fi
+\def\ps@myheadings{\let\@mkboth\@gobbletwo
+ \def\@oddhead{\mkfnt\rightmark \hfil\pgfnt\thepage}%
+ \def\@oddfoot{}\def\@evenhead{\pgfnt \thepage\hfil\mkfnt
+ \leftmark}\def\@evenfoot{}%
+ \def\chaptermark##1{}\def\sectionmark##1{}%
+ \def\subsectionmark##1{}}
+\def\maketitle{\begin{titlepage}%
+ \let\footnotesize\small \let\footnoterule\relax \setcounter{page}{0}%
+ \null \vfil \vskip 5\baselineskip \begin{center}% 60pt
+ {\ttsize\ttfnt\@title\par}\vskip2.45\baselineskip {\ausize\ttfnt\lineskip
+ .62\baselineskip%3em .75em
+ \begin{tabular}[t]{c}\@author \end{tabular}\par}%
+ \vskip 1.25\baselineskip {\dasize \ttfnt \@date \par} \end{center} \par%1.5em
+ \@thanks \vfil \null \end{titlepage}%
+ \setcounter{footnote}{0} \let\thanks\relax
+ \def\@thanks{}\def\@author{}\def\@title{}\let\maketitle\relax}%
+\def\tableofcontents{\@restonecolfalse
+ \if@twocolumn\@restonecoltrue\onecolumn\fi\makeheading{\contentsname
+ \@mkboth{\mkcse{\contentsname}}{\mkcse{\contentsname}}}%
+ \@starttoc{toc}\if@restonecol\twocolumn\fi}
+\def\listoffigures{\@restonecolfalse\if@twocolumn\@restonecoltrue\onecolumn\fi
+ \makeheading{\listfigurename\@mkboth{\mkcse{\listfigurename}}%
+ {\mkcse{\listfigurename}}}\@starttoc{lof}\if@restonecol\twocolumn\fi}
+\def\listoftables{\@restonecolfalse\if@twocolumn\@restonecoltrue\onecolumn\fi
+ \makeheading{\listtablename\@mkboth{\mkcse{\listtablename}}%
+ {\mkcse{\listtablename}}}\@starttoc{lot}\if@restonecol\twocolumn\fi}
+\def\thebibliography#1{\makeheading{\bibname\@mkboth
+ {\mkcse{\bibname}}{\mkcse{\bibname}}}\list
+ {\@biblabel{\arabic{enumiv}}}{\settowidth\labelwidth{\@biblabel{#1}}%
+ \leftmargin\labelwidth\advance\leftmargin\labelsep
+ \usecounter{enumiv}\let\p@enumiv\@empty
+ \def\theenumiv{\arabic{enumiv}}}%
+ \def\newblock{\hskip .11em plus.33em minus.07em}%
+ \sloppy\clubpenalty4000\widowpenalty4000\sfcode`\.=\@m}
+\def\theindex{\@restonecoltrue\if@twocolumn\@restonecolfalse\fi
+ \columnseprule\z@\columnsep 35\p@\twocolumn\makeheading{\indexname
+ \@mkboth{\mkcse{\indexname}}{\mkcse{\indexname}}}%
+ \thispagestyle{plain}\parindent\z@
+ \parskip\z@ plus .3\p@\relax\let\item\@idxitem}
+\def\l@part{\@tocheadline{\z@}{1.8\baselineskip}{3em}{\large\bf}}%2.25em
+\def\l@chapter{\@tocheadline{\@ne}{1em}{1.8em}{\bf}}
+\def\makeheading{\chapter*}
+\fi
+%
+%Article, Book, Report
+%
+\def\section{\@startsection
+{section}{\@ne}{\secindent}{\secpreskp}{\secpstskp}{\secsize\hdfnt}}
+\def\subsection{\@startsection
+{subsection}{\tw@}{\subindent}{\subpreskp}{\subpstskp}{\subsize\hdfnt}}
+\def\subsubsection{\@startsection
+{subsubsection}{3}{\subindent}{\subpreskp}{\subpstskp}{\normalsize\hdfnt}}
+\def\paragraph{\@startsection{paragraph}{4}{\subindent}%
+{\subpreskp}{\parpstskp}{\normalsize\hdfnt}}
+\def\subparagraph{\@startsection{subparagraph}%
+{5}{\parindent}{\subpreskp}{\parpstskp}{\normalsize\hdfnt}}
+%
+% section layout
+%
+\def\@makesecdot#1{\expandafter\let\expandafter\@secdot\csname the#1\endcsname
+ \ifx\@secdot\@empty\else\refstepcounter{#1}\toks@\expandafter{%
+ \csname p@#1\endcsname}\edef\@secdot{%
+ \the\toks@\expandafter\@gobifnul\csname the#1\endcsname\nmdot}\fi}
+ %not \@secdot
+\def\@makesvsec#1{\ifind #1<\z@\def\@svsec{\llap{\@secdot}\hskip-#1}\else
+ \def\@svsec{\@gobifnul\@secdot\quad}\fi}
+\def\@contmark#1#2#3{\csname #1mark\endcsname{#3}\addcontentsline
+ {toc}{#1}{\ifnum #2>\c@secnumdepth\else\protect\numberline{\@secdot}\fi#3}}
+\def\@startsection#1#2#3#4#5#6{\if@noskipsec\leavevmode\fi
+ \par\@tempskipa #4\@afterindenttrue
+ \ifdim\@tempskipa<\z@\@tempskipa-\@tempskipa\@afterindentfalse\fi
+ \fpind\if@nobreak\everypar{}\else
+ \addpenalty{\@secpenalty}\addvspace{\@tempskipa}\fi\@ifstar
+ {\@ssect{#3}{#5}{#6}}{\@dblarg{\@sect{#1}{#2}{#3}{#5}{#6}}}}
+\def\@sect#1#2#3#4#5[#6]#7{\@tempskipa #4\let\@svsec\@empty
+ \ifnum#2>\c@secnumdepth\else\@makesecdot{#1}\@makesvsec{#3}\fi
+ \ifdim\@tempskipa>\z@
+ \begingroup#5\@hangfrom{\hskip #3\relax\@svsec}{\interlinepenalty
+ \@M\ifnum#2>\c@hddepth\else\hdpos\fi#7\par}\endgroup
+ \@contmark{#1}{#2}{#6}\else
+ \def\@svsechd{\@contmark{#1}{#2}{#6}#5\hskip#3\@svsec
+ \@gobifnul{#7}\hddot}\fi\@xsect{#4}}
+\def\@ssect#1#2#3#4{\@tempskipa #2\relax\ifdim \@tempskipa>\z@
+ \begingroup #3\@hangfrom{\ifind #1< \z@\else \hskip #1\fi}{\interlinepenalty
+ \@M\ifnum#2>\c@hddepth\else\hdpos\fi#4\par}\endgroup\else
+ \def\@svsechd{#3\ifind #1<\z@\else
+ \hskip #1\fi\@gobifnul{#4}\hddot}\fi\@xsect{#2}}
+\let\ifind\ifdim
+%
+% contents lines
+%
+\def\@tocheadline#1#2#3#4#5#6{\ifnum#1>\c@tocdepth\else
+ \addpenalty\@secpenalty\vskip#2 plus\p@\begingroup
+ \interlinepenalty\@M\rightskip\@tocrmarg\parfillskip-\@tocrmarg
+ \secindent#3\noindent\leavevmode\hangindent\secindent
+ \reset@font\rm#4#5\@tocpagenum{#6}\par\endgroup
+ \penalty\@highpenalty\fi}
+\def\@dottedtocline#1#2#3#4#5{\ifnum #1>\c@tocdepth \else
+ \vskip \z@ plus.2\p@\begingroup\leftskip#2\interlinepenalty\@M
+ \rightskip\@tocrmarg\parfillskip-\@tocrmarg\secindent#3%
+ \noindent\leavevmode\hangindent\secindent\reset@font\rm#4\nobreak\leaders
+ \hbox{$\m@th \mkern \@dotsep mu.\mkern \@dotsep mu$}\hfill \nobreak
+ \hbox to\@pnumwidth{\hfil\reset@font\rm #5}\par\endgroup\fi}
+\def\@tocpagenum#1{\nobreak\hfill\nobreak\hbox to\@pnumwidth{\hss#1}}
+\def\numberline#1{\hbox to \secindent{#1\hfil} }
+%
+% REDEFINITIONS here:
+%
+% This line must be last line of code
+\catcode`\@\neq\let\neq\ne\endinput
+
+*******************
+ DOCUMENTATION
+*******************
+Leslie Lamport in writing LaTeX assumed that authors would write
+complete .sty (.clo) files to implement the design decisions for their
+publications. However, the overwhelming majority of LaTeX publications use the
+standard styles supplied by Lamport. These implement a particular set of
+typographic conventions, which while consistent are not of universal validity,
+for instance many publishers and authors would like a full stop:
+`4. Introduction'
+rather than
+`4 Introduction'.
+
+This file modifies the standard classes so that other conventions can be
+more easily implemented. Careful use of the file will allow a greater
+variation in the appearance of LaTeX documents.
+
+0. Changes to section implementation.
+The file redefines the way LaTeX deals with negative indents for section
+headings, placing the number in the margin and the heading itself flush
+with the margin. With negative indents it sets starred section headings
+flush (as it does when \thesection is empty.
+Standard LaTeX indenting can be produced by typing
+>> \let\ifind\iffalse
+This file's version can be reestablished by typing
+>> \let\ifind\ifdim
+
+The file also changes the way LaTeX reacts to empty numbers when sections have
+non-negative indents, placing the heading where the number would go, rather
+than further indented (as in standard LaTeX).
+This effect can be removed by redefining an internal macro \@makesvsec (see
+below).
+
+The indents, pre- and postskips for section headings are placed in registers
+so that they are constant throughout a document and (just as the heading sizes)
+do not react to surrounding size changes. You can change this back to ordinary
+LaTeX behaviour by \def ing them as macros rather than setting the register
+values (in that case you should probably use \smaller\larger from
+SMALLER.STY for the \...size commands).
+
+WARNING LaTeX typesets headings that run on by manipulating \everypar. If you
+make local changes to the heading style of such a section inside braces or a
+group you must ensure that a non-empty paragraph occurs before the closing
+brace. Otherwise some strange effects may occur, because the \everypar tokens
+will be evaluated outside the group (this is a feature of LaTeX, not of
+SECTION.STY). If your group ends with an empty section of this type just
+follow it with \leavevmode or an explicit space: \ .
+
+A detailed description of the format of LaTeX sectioning commands is given
+below (in paragraph 9). This is partially taken from the file LATEX.TEX.
+We first list the macros for local control which you can use without knowing
+this structure.
+
+The file sets vertical distances that LaTeX expressed in terms of `em's and
+`ex's in equivalent `\baselineskip's, as `em' is a measure of the horizontal
+size of a font and `ex' is not a true measure of the full height of a line.
+Earlier vesions used `ex's.
+
+The original values are placed as comments.
+
+1. Sizing commands for Parts, Chapters and Titles etc
+These are set to \large or whatever
+
+>> \chsize: Chapter, Part Heading (\LARGE\large)
+>> \hdsize: Chapter, Part Title Text (\Huge\huge\LARGE)
+>> \ttsize: Title of Document (\Huge\huge\LARGE)
+>> \ausize: Author (\LARGE\Large)
+>> \dasize: Date. (\Large\large)
+>> \secsize: Section (\Large\large)
+>> \subsize: Subsection (\large\normalsize)
+ subsubsection and below use \normalsize
+
+2. Layout commands for headings.
+>> \hdpos: Positioning of heading (\raggedright) (\centering \raggedleft)
+ (see section 9);
+>> counter hddpth (default 0)
+ Maximum section level for \hdpos (chapters and parts ALWAYS use hdpos).
+ To centre section headings and above:
+ \let\hdpos\centering\setcounter{hddepth}{1}
+>> \fpind: Indenting of first paragraph after \Part \Chapter
+ and also to override setting via preskip for sections.
+ \let to \@afterindenttrue to indent, \@afterindentfalse for flush,
+ \relax: flush after \Part \Chapter, negative preskips; indented otherwise
+ (LaTeX default behaviour).
+
+3. Fonts
+>> \ttfnt: font for title entries.
+>> \hdfnt: font for all other headings (Part, Chapter..subparagraph).
+>> \fefnt: font for theorem headings and description labels (fe=feature).
+>> \thfnt: font for theorem statements.
+>> \pgfnt: font for page numbers.
+>> \mkfnt: font for page headings (mk=mark).
+>> \mkcse: case for page headings.
+ These can also be used to add other initial commands such as spaces or
+ symbols.
+
+4. Optional punctuation (standard|my preference)
+ These marks are transferred via auxiliary files for tables of contents etc.
+ They should be \def'd if their current value is to be transferred, and \let
+ if the value in force when the file auxiliary is read should be used.
+
+>> \hddot ({}|.) (after inline headings, theorems etc)
+>> \cpdot (:|.) (in figure/table captions - also apears in list of figures.
+>> \nmdot ({}|.) (after section numbers etc)
+
+If these are \let to a single letter they are not expanded in the
+ .toc.. files. So to remove \cpdot from list of figures:
+ \let\cpdot\relax\listoffigures\let\cpdot:
+
+5. Spacing parameters.
+ The macros for chapters and parts have been altered so that all the
+ vertical spacing commands are in a single macro in each case.
+
+>> \part inserts initial vertical space directly (preceded by \hbox{} if it
+ is to be immovable) and passes the space between Part n and title
+ in \@tempskipa and the space below the heading in \@tempskipb.
+>> Both \chapter and \chapter* call \@makechapterhead{chaptertitle}.
+ This passes {chaptertitle} on to \@makeschapterhead together with the
+ vertical spacing. Default setting is
+ \def\@makechapterhead#1{\hbox{}\@makeschapterhead{#1}{50\p@}{20\p@}{40\p@}}
+ \hbox{} makes first skip immovable,
+ the first length is space above the heading,
+ The second is the space between Chapter nn and the chapter title
+ The third is the space below the heading.
+ For both Part and Chapter the middle space is removed if either the
+ section name or title are missing.
+ If both are missing, the first space is also removed
+
+>> For sections and below the spaces are kept in registers:
+ \secpreskp and \secpsrskp \secindent used for \section
+ \subpreskp and \subpstskp \subindent used for \subsection/\subsubsection
+ \paragraph uses \subindent \subpreskp \parpstskp
+ \subparagraph uses \parindent \subpreskp \parpstskp
+
+>> \secindent \subindent Heading indentation
+>> \secpreskp \subpreskp Space before
+>> \secpstskp \subpstskp \parpstskp Space after.
+
+6. Internal modifications
+
+ Sections with negative indents have heading flush with margin.
+
+ If \thesection is \empty
+ \let\thesection\empty or \def\thesection{}
+ then section does not step the section counter.
+ If the section produces empty output for a value then
+ the section will start flush at the margin or \secindent if it is positive
+ and there will be no \nmdot.
+ It will produce (flush) page headings and a table of contents entry.
+ Similarly if \thechapter or \thepart are defined to be empty they will
+ suppress the heading line `Chapter..' and not step the counter.
+ To restore standard LaTeX behaviour temporarily define \thesection to be
+ \empty
+ \def\thesection{\empty}
+ In that case you can adjust post number spacing in the heading.
+ \section[Heading]{\hskip-1em Heading}
+ You can also redefine \@makesecdot see paragraph 7.
+
+WARNING \letting \thesection etc to an unexpandable token (like \relax) will
+cause strange effects under LaTeX because its value will not be expanded.
+
+ \maketitle suppresses page headings (\thispagestyle{empty}) and only resets
+ \@title etc locally. So place in a group if you want to preserve these for
+ later reference (eg. in headers).
+
+7. New internal macros
+ Place any modifications in the section REDEFINITIONS of the main code
+
+> \@secdot contains section number and \nmdot if the number is non-empty.
+> \@makesecdot{NAME} defines \@secdot.
+ To make LaTeX step the section counter independently of the definition
+ of \thesection and always print \nmdot:
+ \def\@makesecdot#1{\refstepcounter{#1}%
+ \edef\@secdot{\csname the#1\endcsname}}
+ If you want \nmdot suppressed when \thesection produces no output:
+ \def\@makesecdot#1{\refstepcounter{#1}%
+ \edef\@secdot{\expandafter\@gobifnul\csname the#1\endcsname\nmdot}}
+> \@makesvsec{INDENT} defines the \@svsec macro used by LaTeX to typeset the
+ section number.. Its parameter is the indent so that it can react
+ differently to negative indents. (it does NOT make the indent).
+ To obtain standard LaTeX behaviour:
+ \def\@makesvsec#1{\def\@svsec{\@secdot\quad}}
+ To make positioning commands apply to the heading ignoring the number:
+ \def\@makesvsec#1{\def\@svsec{\llap{@secdot\quad}}}
+ Do NOT forget the #1.
+> \@contmark{NAME}{LEVEL}{HEADING} makes contents line and sectionmark.
+
+ Contents headlines are defined by
+> \@tocheadline
+ This allows these lines to be adjusted similarly to the \@dottedtocline
+ commands for other contents lines. The format of these is defined below (in
+ paragraph 11).
+>@tocpagenum#1 sets #1 flush right in \@tocheadline.
+ Redefine (\let\@tocpagenum\@gobble) to remove page numbers.
+ \def\l@part{\@tocheadline{0}{2.25em}{3em}{\let\@tocpagenum\@gobble
+ \centering\large\bf}}
+ Centres parts lines of contents but leaves chapters unchanged
+ \def\l@part{\@tocheadline{0}{2.25em}{3em}{\let\@tocpagenum\@gobble
+ \centering\def\numberline##1{\hskip-\secindent
+ \hbox to\secindent{##1\hfil}}\large\bf}}
+ Same but centring ignores part number.
+ \def\l@part{\@tocheadline{0}{2.25em}{3em}{\let\@tocpagenum\@gobble
+ \centering\def\numberline##1{\hfilneg
+ \hbox to\z@{##1\hss}\hfil}\large\bf}}
+ Centres heading with number flush left
+ Contents lines use \secindent as a temporary register
+
+>\makeheading (set to \section*, \chapter*)
+ Makes headings for contents, index etc.
+ To put Contents itself in the contents list, redefine (locally):
+ \let\thesection\empty\let\makeheading\section
+
+8. Additional macros
+> \@ifempty{test}{yes}{no} like \@ifundefined but tests for empty
+ (fails iff test starts with ~ of catcode 12 (other) ).
+> \@gobifnul{a}{b} = \@ifempty{a}{}{ab}.
+
+9. Description of sectioning values
+
+ \@startsection {NAME}{LEVEL}{INDENT}{PRESKIP}{POSTSKIP}{STYLE}
+ optional * [ALTHEADING]{HEADING}
+ Generic command to start a section.
+
+ NAME : e.g., 'subsection' must be the name of a section counter
+ LEVEL : a number, denoting depth of section -- section=1;
+ number increases down the hierarchy.
+ INDENT : Indentation of heading from left margin
+ PRESKIP : Absolute value = skip to leave above the heading.
+ If negative, then paragraph indent of text following
+ heading is suppressed.
+ POSTSKIP : if positive, then skip to leave below heading, else
+ negative of skip to leave to right of run-on heading.
+ ALTHEADING : for page headings and contents.
+ STYLE : commands to set style
+ If '*' missing, then increments the counter. If it is present, then
+ there should be no [ALTHEADING] argument.
+ Uses the counter 'secnumdepth' whose value is the highest section
+ level that is to be numbered and entered into \@dottedtocline.
+
+10. Treatment of Section Entries
+
+ NAME (fixed) Determines the counter to use.
+
+ LEVEL (fixed) If level is greater than \counter{secnumdepth} (default 2) no
+ indexentry or number
+
+ INDENTS: \secindent (sections), \subindent (subsections,...,paragraphs).
+ Subparagraphs have \parindent fixed. These are dimensions.
+
+ Recommended: +-\parindent or 0pt
+
+ If indent is negative then SECTION.STY causes the section number to be set
+ flush right that distance from margin. Heading or text follows at the margin
+ itself.
+
+ Unnumbered headings are set at the margin if indent is negative. If the
+ indent is non-negative they are set flush left with the number position.
+
+ PRESKIPS \secpreskp (sections), \subpreskp(subsections..subparagraphs)
+ POSTSKIPS \secpstskp (sections),\subpstskp(subsections,subsubsections)
+ \parpstskp (paragraphs,subparagraphs)
+
+ Recommended: leave PRESKIPS' abs values unchanged, They are set -ve to
+ have flush first paragraphs. Use \secpreskp-\secpreskp to indent them.
+ Recommended: set POSTSKIPS to -1em or -\parindent to make sections run on.
+
+ By assigning these values to registers SECTION.STY makes them independent of
+ the surrounding font and size. Set the registers if you want this, redefine
+ them as macros if you want them to be font and size dependent.
+
+ STYLE \secsize \subsize \hdfnt size and fonts.
+ \secsize for sections,
+ \subsize for subsections.
+ Subsubsections and below have \normalsize (fixed).
+ \hdfnt is universal for all headings.
+
+11. Contents entries.
+
+ \@tocheadline{LEVEL}{PRESKIP}{INDENT}{STYLE}{ENTRY}{PAGENUM}
+ \@dottedtocline{LEVEL}{MARGIN}{INDENT}{ENTRY}{PAGENUM}
+
+ LEVEL : determines if entry made.
+ PRESKIP : vertical gap above.
+ INDENT : This must leave enough room for the chapter or section number
+ : It is added to the margin for the next level.
+ MARGIN : Left margin inherited from level above (zero for headlines).
+ STYLE : Font sizing and setting.
+
+ LaTeX assumes that the ENTRY for sections be defined by a macro \l@section.
+ These are defined in the standard document styles but can be changed.
+ All entries of the \l@section commands are fixed. SECTION.STY does not
+ change the commands using \@dottedtocline in the style file. Those that do
+ not do so (\l@part, \l@chapter) are modified to use \@tocheadline.
+
+ INDENT for sections in {article} and chapters in {report} is rather tight at
+ 1.5em. If you increase it should also increase the MARGINS for lower
+ sections.
+
+12. The following internal LaTeX macros are redefined:
+
+ \part\@part\@spart\@endpart
+ \@chapter\@schapter (also \fi moved)
+ \@makechapterhead functions of these have been significantly
+ \@makeschapterhead changed.
+
+ \ps@headings\ps@myheadings
+ \section\subsection
+ \subsubsection\paragraph
+ \subparagraph
+ \thebibliography
+ \theindex
+ \@begintheorem
+ \@oparbegintheorem
+ \@makecaption optional style features added
+ \@startsection \fpind and does not pass #4 to \@sect,\@ssect
+ \@sect,\@ssect ignored parameter removed
+ \llap \@secdot used to adjust spacing
+ if \p@section defined used for number style.
+ calls \@makesecdot
+ \@sect only: \@makesvsec and
+ \@contmark, which is moved in
+ \@svsechd so that \unskip in \@xsect works).
+ \maketitle\@maketitle suppress page number, reset \@title.. locally
+ \numberline adds space after number, so overfull box if
+ too close to heading.
+
+CHANGES
+ Ver 1.3 (3.Apr 98)
+ If \secindent < 0, then \section* produces a flush heading, not outdented.
+ \hdpos takes level as parameter and is used for all sections, not just
+ \part and \chapter.
+ `ex' measurements replaced by \baselineskip equivalents.
+ Ver 1.31
+ Bugfix: \relax added to \@alph, \@Alph to enable use with \@ifempty test.
+ Ver 1.32
+ Bugfixes: \hdpos added to \@ssect, unused macro \secpos removed,
+ \nobreak added after \thechapter in \makechapterhead
+ Ver 1.4
+ \hdpos made simple macro again. Counter \hddepth determines when it
+ should be used. Functions of \@makechapterhead, \@smakechapterhead
+ changed to make editing vertical spacing of chapters easier.
+ \part\@part\@spart rewritten so that all spacing info in \part.
+ \part calls \@spart which finishes off the heading.
+ Memory use < 200 words.
+End of SECTION.STY \ No newline at end of file