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+% \iffalse meta-comment
+%
+% Copyright (C) 2004 Scott Pakin <scott+eqp@pakin.org>
+% ----------------------------------------------------
+%
+% This package may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.2
+% 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 1.2 or later is part of all distributions of LaTeX
+% version 1999/12/01 or later.
+%
+% \fi
+% \iffalse
+%% File: eqparbox.dtx Copyright (C) 2004 Scott Pakin <scott+eqp@pakin.org>
+%
+%<package>\NeedsTeXFormat{LaTeX2e}
+%<package>\ProvidesPackage{eqparbox}
+%<package>         [2004/08/02 v2.1 Create equal-widthed parboxes]
+%
+%<*driver>
+\documentclass{ltxdoc}
+\usepackage{eqparbox}
+\EnableCrossrefs
+\CodelineIndex
+\RecordChanges
+
+% Uncomment the following line if you don't want to include a
+% source-code listing.
+%\OnlyDescription
+
+% Give LaTeX some more leeway in placing floats
+% (suggested by Donald Arseneau <asnd@triumf.ca>).
+\renewcommand{\topfraction}{0.85}
+\renewcommand{\bottomfraction}{0.7}
+\renewcommand{\textfraction}{0.15}
+\renewcommand{\floatpagefraction}{0.66}
+\renewcommand{\dbltopfraction}{0.66}
+\renewcommand{\dblfloatpagefraction}{0.66}
+\setcounter{topnumber}{9}
+\setcounter{bottomnumber}{9}
+\setcounter{totalnumber}{20}
+\setcounter{dbltopnumber}{9}
+
+% Because we put table captions *above* tables, we should add a
+% little extra space between the caption and the table.
+\setlength{\belowcaptionskip}{2ex}
+
+\begin{document}
+\DocInput{eqparbox.dtx}
+\end{document}
+%</driver>
+% \fi
+%
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% \CheckSum{169}
+% \GetFileInfo{eqparbox.sty}
+%
+% \title{The \textsf{eqparbox} package\thanks{This file
+%         has version number \fileversion, last
+%         revised \filedate.}}
+% \author{Scott Pakin \\ \textit{scott+eqp@pakin.org}}
+% \date{\filedate}
+% \maketitle
+%
+% \changes{v1.0}{2001/04/19}{Initial version}
+% \changes{v2.0}{2004/07/31}{Rewrote to use only two \meta{dimen}s total
+%   and the rest macros (problem reported by Gilles P\'erez-Lambert and
+%   Plamen Tanovski; solution suggested by David Kastrup and Donald
+%   Arseneau)}
+%
+% \DoNotIndex{\@auxout,\@ifnextchar,\@ifundefined}
+% \DoNotIndex{\begin,\begingroup,\csname,\DeclareRobustCommand,\def}
+% \DoNotIndex{\else,\end,\endcsname,\endgroup,\expandafter,\fi,\gdef,\global}
+% \DoNotIndex{\hbox,\ifdim,\ifx,\immediate,\let}
+% \DoNotIndex{\newcommand,\newdimen,\newif,\newlength,\noexpand}
+% \DoNotIndex{\relax,\setbox,\space,\string,\the,\wd,\xdef,\z@}
+%
+% \begin{abstract}
+%   The \textsf{eqparbox} package makes it easy to define a group of
+%   \verb|\parbox|es whose members all have the same width, the natural
+%   width of the widest member.  A document can contain any number of
+%   groups, and each group can contain any number of members.  This
+%   simple, equal-width mechanism can be used for a variety of alignment
+%   purposes, as is evidenced by the examples in this document.
+% \end{abstract}
+%
+% \section{Motivation}
+%
+% Let's start with a little test.  How would you typeset
+% Table~\ref{tbl:sales-data}, in which the numbers are right-justified
+% relative to each other but centered as a group within each column.
+% And second, how would you typeset the r\'esum\'e excerpt shown in
+% Figure~\ref{fig:resume-excerpt} while meeting the following
+% requirements:
+%
+% \begin{enumerate}
+%   \item The header columns must be left-justified relative to each
+%         other.
+%   \item The headers columns should be evenly spaced across the page.
+%   \item Page breaks should be allowed within the r\'esum\'e.
+% \end{enumerate}
+%
+% \begin{table}[tp]
+% \centering
+% \caption{Sample sales data}
+% \label{tbl:sales-data}
+% \begin{tabular}{@{}lccc@{}} \hline
+%   & \multicolumn{3}{c}{Sales (in millions)} \\ \cline{2-4}
+%   \multicolumn{1}{c}{\raisebox{1ex}[2ex]{Product}} &
+%   October & November & December \\ \hline
+%
+%   Widgets      & \eqparbox{oct}{\raggedleft         55.2 } &
+%                  \eqparbox{nov}{\raggedleft\textbf{ 89.2}} &
+%                  \eqparbox{dec}{\raggedleft         57.9 } \\
+%   Doohickeys   & \eqparbox{oct}{\raggedleft\textbf{ 65.0}} &
+%                  \eqparbox{nov}{\raggedleft         64.1 } &
+%                  \eqparbox{dec}{\raggedleft          9.3 } \\
+%   Thingamabobs & \eqparbox{oct}{\raggedleft         10.4 } &
+%                  \eqparbox{nov}{\raggedleft          8.0 } &
+%                  \eqparbox{dec}{\raggedleft\textbf{109.7}} \\ \hline
+% \end{tabular}
+% \end{table}
+%
+% \begin{figure}
+% \bigskip\noindent\rule{\linewidth}{1pt}\bigskip\par
+% \noindent%
+% \eqparbox{place}{\textbf{Widgets, Inc.}} \hfill
+% \eqparbox{title}{\textbf{Senior Widget Designer}} \hfill
+% \eqparbox{dates}{\textbf{1/95--present}}
+%
+% \begin{itemize}
+%   \item Supervised the development of the new orange and blue widget lines.
+%   \item Improved the design of various widgets, making them less sticky
+%         and far less likely to explode.
+%   \item Made widget management ten times more cost-effective.
+% \end{itemize}
+%
+% \noindent%
+% \eqparbox{place}{\textbf{Thingamabobs, Ltd.}} \hfill
+% \eqparbox{title}{\textbf{Lead Engineer}} \hfill
+% \eqparbox{dates}{\textbf{9/92--12/94}}
+%
+% \begin{itemize}
+%   \item Found a way to make thingamabobs run on solar power.
+%   \item Drafted a blueprint for a new doohickey-compatibility module for
+%         all cool-mint thingamabobs.
+%   \item Upgraded superthingamabob specification document from Microsoft
+%         Word to \LaTeXe.
+% \end{itemize}
+% \noindent\rule{\linewidth}{1pt}
+% \caption{Excerpt from a sample r\'esum\'e}
+% \label{fig:resume-excerpt}
+% \end{figure}
+%
+% The two questions can be answered the same way: by putting various
+% blocks of text into equal-widthed boxes.  if the data in
+% Table~\ref{tbl:sales-data} are put into equal-sized |\parbox|es, each
+% containing a |\raggedleft| for right-justification, the |\parbox|es
+% can then be centered to achieve the desired result.  Similarly, if the
+% company names in Figure~\ref{fig:resume-excerpt} are both put in a
+% |\parbox| as wide as ``Thingamabobs, Ltd.,'' the job titles in a
+% |\parbox| as wide as ``Senior Widget Designer,'' and the dates in a
+% |\parbox| as wide as ``1/95--present,'' then they can be spaced evenly
+% by separating them with |\hfill|s.
+%
+% The problem is in choosing the width for each set of |\parbox|es.  For
+% Table~\ref{tbl:sales-data}, this isn't too difficult, because digits
+% are the same width as each other in most fonts.  Each |\parbox|,
+% therefore, need be only as wide as the largest sequence of digits
+% expected.  Figure~\ref{fig:resume-excerpt} is more of a bother.  The
+% user must typeset the r\'esum\'e once to see which entry in each
+% column is the widest and then assign lengths appropriately:
+%
+% \begin{verbatim}
+%     \newlength{\placewidth}
+%     \settowidth{\placewidth}{Thingamabobs, Ltd.}         % Employment 2
+%     \newlength{\jobtitlewidth}
+%     \settowidth{\jobtitlewidth}{Senior Widget Designer}  % Employment 1
+%     \newlength{\dateswidth}
+%     \settowidth{\dateswidth}{1/95--present}              % Employment 1
+% \end{verbatim}
+%
+% \noindent
+% Every time a piece of information changes, it must be changed in two
+% places: in the r\'esum\'e itself and in the |\settowidth|
+% command.  When employment information is added or deleted, the
+% |\settowidth| commands must be modified to reflect the new
+% maximum-widthed entry in each column.  If only there were a simpler
+% way to keep a set of |\parbox|es as wide as the widest entry in the
+% set\,\dots
+%
+% That simpler way is the \textsf{eqparbox} package.  \textsf{eqparbox}
+% exports a macro, |\eqparbox|, which works just like |\parbox|, except
+% that instead of specifying the width of the box, one specifies the
+% group that the box belongs to.  All boxes in the same group will be
+% typeset as wide as the widest member of the group.  In that sense, an
+% |\eqparbox| behaves like a cell in an~|l|, |c|, or~|r| column in a
+% |tabular|; |\eqparbox|es in the same group are analogous to
+% cells in the same column.
+%
+% \section{Usage}
+%
+% \DescribeMacro{\eqparbox}
+% The primary macro in the \textsf{eqparbox} package is |\eqparbox|.
+% Usage is almost identical to that of |\parbox|:
+%
+% \begin{center}
+% |\eqparbox| \oarg{pos} \oarg{height} \oarg{inner-pos}
+% \marg{tag} \marg{text}
+% \end{center}
+%
+% \noindent
+% The only difference is that, where |\parbox| has its \meta{width}
+% argument, |\eqparbox| has \meta{tag}.  (For a description of the
+% remaining arguments, look up |\parbox| in any \LaTeXe\ book or in
+% the \texttt{usrguide.tex} file that comes with \LaTeXe.)  \meta{tag}
+% can be any valid identifier.  All |\eqparbox|es with the same tag
+% will be typeset in a box wide enough to hold the widest of them.
+% Discounting \TeX's limitations, any number of tags can be used in the
+% same document, and any number of |\eqparbox|es can share a tag.
+%
+% The only catch is that \texttt{latex} will need to be run a second
+% time for the various box widths to stabilize.
+%
+% \bigskip
+%
+% \DescribeMacro{\eqboxwidth}
+% It is sometimes useful to take the width of an |\eqparbox| to use in
+% other \LaTeX{} commands.  While the width can be determined by
+% creating an |\eqparbox| and using |\settowidth| to measure it, the
+% \textsf{eqparbox} package defines a convenience routine called
+% |\eqboxwidth| that achieves the same result.
+%
+% |\eqboxwidth| makes it easy to typeset something like
+% Table~\ref{tbl:mixed-tabular}.  Table~\ref{tbl:mixed-tabular}'s only
+% column expands to fit the widest cell in the column, excluding the
+% final cell.  The final cell's text word-wraps within whatever space is
+% allocated to it.  In a sense, the first four cells behave as if they were
+% typeset in an~|l| column, while the final cell behaves as if it were
+% typeset in a~|p| column.  In actuality, the column is an~|l| column;
+% an |\eqparbox| for the first four cells ensures the column stretches
+% appropriately, while a |\parbox| of width |\eqboxwidth{|\meta{tag}|}|
+% in the final cell ensures that the final cell word-wraps.
+%
+% \begin{table}
+% \centering
+% \caption{A \texttt{tabular} that stretches to fit some cells while
+% forcing others to wrap}
+% \label{tbl:mixed-tabular}
+% \DeleteShortVerb{\|}
+% \begin{tabular}{|@{}l@{}|}
+%   \hline
+%   \eqparbox[b]{wtab}{Wide} \\ \hline
+%   \eqparbox[b]{wtab}{Wider} \\ \hline
+%   \eqparbox[b]{wtab}{Wider than that} \\ \hline
+%   \eqparbox[b]{wtab}{This is a fairly wide cell} \\ \hline
+%   \parbox[b]{\eqboxwidth{wtab}}{\strut
+%     While this cell's text wraps, the previous cells (whose text
+%     doesn't wrap) determine the width of the column.} \\ \hline
+% \end{tabular}
+% \MakeShortVerb{\|}
+% \end{table}
+%
+% \section{Examples}
+%
+% Figure~\ref{fig:resume-excerpt}'s headings were typeset with the
+% following code:
+%
+% \begin{verbatim}
+%     \noindent%
+%     \eqparbox{place}{\textbf{Widgets, Inc.}} \hfill
+%     \eqparbox{title}{\textbf{Senior Widget Designer}} \hfill
+%     \eqparbox{dates}{\textbf{1/95--present}}
+% \end{verbatim}
+% \centerline{$\vdots$}
+% \begin{verbatim}
+%     \noindent%
+%     \eqparbox{place}{\textbf{Thingamabobs, Ltd.}} \hfill
+%     \eqparbox{title}{\textbf{Lead Engineer}} \hfill
+%     \eqparbox{dates}{\textbf{9/92--12/94}}
+% \end{verbatim}
+% \centerline{$\vdots$}
+% \bigskip
+%
+% \noindent
+% Table~\ref{tbl:sales-data} was entered as follows:
+%
+% \begin{verbatim}
+%     \begin{tabular}{@{}lccc@{}} \hline
+%       & \multicolumn{3}{c}{Sales (in millions)} \\ \cline{2-4}
+%       \multicolumn{1}{c}{\raisebox{1ex}[2ex]{Product}} &
+%       October & November & December \\ \hline
+%
+%       Widgets      & \eqparbox{oct}{\raggedleft         55.2 } &
+%                      \eqparbox{nov}{\raggedleft\textbf{ 89.2}} &
+%                      \eqparbox{dec}{\raggedleft         57.9 } \\
+%       Doohickeys   & \eqparbox{oct}{\raggedleft\textbf{ 65.0}} &
+%                      \eqparbox{nov}{\raggedleft         64.1 } &
+%                      \eqparbox{dec}{\raggedleft          9.3 } \\
+%       Thingamabobs & \eqparbox{oct}{\raggedleft         10.4 } &
+%                      \eqparbox{nov}{\raggedleft          8.0 } &
+%                      \eqparbox{dec}{\raggedleft\textbf{109.7}} \\ \hline
+%     \end{tabular}
+% \end{verbatim}
+%
+% \noindent
+% Note that the above can be simplified by defining a macro that
+% combines |\eqparbox| and |\raggedleft|.  Furthermore, because the
+% numeric data being typeset are all approximately the same width, a
+% single tag could reasonably replace |oct|, |nov|, and |dec|.  As it
+% stands, the code serves more as an illustration than as an optimal way
+% to typeset Table~\ref{tbl:sales-data}.
+%
+% Finally, Table~\ref{tbl:mixed-tabular} was typeset using the
+% following code:
+%
+% \begin{verbatim}
+%     \begin{tabular}{|@{}l@{}|}
+%       \hline
+%       \eqparbox[b]{wtab}{Wide} \\ \hline
+%       \eqparbox[b]{wtab}{Wider} \\ \hline
+%       \eqparbox[b]{wtab}{Wider than that} \\ \hline
+%       \eqparbox[b]{wtab}{This is a fairly wide cell} \\ \hline
+%       \parbox[b]{\eqboxwidth{wtab}}{\strut
+%         While this cell's text wraps, the previous cells (whose text
+%         doesn't wrap) determine the width of the column.} \\ \hline
+%     \end{tabular}
+% \end{verbatim}
+%
+% As an additional example, consider the paragraphs depicted in
+% Figure~\ref{fig:hang-indent}.  We'd like the paragraph labels set on
+% the left, as shown, but we'd also like to allow both intra-~and
+% inter-paragraph page breaks.  Of course, if the labels are made wider
+% or narrower, we'd like the paragraph widths to adjust automatically.
+% (Can any word processor do that, incidentally?)  By using a custom
+% |list| environment which typesets its labels with |\eqparbox|, this is
+% fairly straightforward:
+%
+% \begin{figure}[tbp]    ^^A NOT "here" (in case the default is changed)
+% \rule{\linewidth}{1pt}
+% \begin{list}{}{^^A
+%   \renewcommand{\makelabel}[1]{\eqparbox[b]{listlab}{#1}}^^A
+%   \setlength{\labelwidth}{\eqboxwidth{listlab}}^^A
+%   \setlength{\labelsep}{2em}^^A
+%   \setlength{\parsep}{2ex plus 2pt minus 1pt}^^A
+%   \setlength{\itemsep}{0pt}^^A
+%   \setlength{\leftmargin}{\labelwidth}^^A
+%   \addtolength{\leftmargin}{\labelsep}^^A
+%   \setlength{\rightmargin}{0pt}}
+%
+%   \item[Stuff about me] I am great.  Blah, blah, blah, blah, blah,
+%   blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah,
+%   blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah,
+%   blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah,
+%   blah.
+%
+%   \item[More stuff] I am wonderful.  Blah, blah, blah, blah, blah,
+%   blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah,
+%   blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah,
+%   blah.
+%
+%   Did I mention that blah, blah, blah, blah, blah, blah, blah, blah,
+%   blah, blah, blah, blah, blah, blah, blah?
+%
+%   \item[The final exciting thing] I am fantastic.  Blah, blah, blah,
+%   blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah,
+%   blah, blah, blah, blah, blah, blah, blah, blah, blah.
+% \end{list}
+% \rule{\linewidth}{1pt}
+% \caption{Paragraphs with hanging indentation}
+% \label{fig:hang-indent}
+% \end{figure}
+%
+% \begin{verbatim}
+%     \begin{list}{}{%
+%       \renewcommand{\makelabel}[1]{\eqparbox[b]{listlab}{#1}}%
+%       \setlength{\labelwidth}{\eqboxwidth{listlab}}%
+%       \setlength{\labelsep}{2em}%
+%       \setlength{\parsep}{2ex plus 2pt minus 1pt}%
+%       \setlength{\itemsep}{0pt}%
+%       \setlength{\leftmargin}{\labelwidth+\labelsep}%
+%       \setlength{\rightmargin}{0pt}}
+%
+%       \item[Stuff about me]  I am great.  Blah, blah, blah, ...
+%
+%       \item[More stuff]  I am wonderful.  Blah, blah, blah, ...
+%
+%       \item[The final exciting thing]  I am fantastic.  Blah,
+%          blah, blah, ...
+%     \end{list}
+% \end{verbatim}
+%
+%
+% \section{Limitations}
+%
+% Unfortunately, |\eqparbox| has a number of limitations not exhibited
+% by the original |\parbox| command.  First, |\eqparbox| internally
+% typesets the given text within a |tabular| environment---specifically,
+% using ``|@{}l@{}|'' as the template---in order to determine the text's
+% natural width.  Consequently, commands not valid within such a
+% |tabular| (e.g.,~list environments) are also not valid within the
+% \meta{text} argument of |\eqparbox|.  As a corollary, an |\eqparbox|
+% can appear only where a |tabular| is also acceptable.
+%
+% A second limitation is that |\eqparbox| typesets its \meta{text}
+% argument \emph{twice}: once within a |tabular| to determine the
+% natural width and again within a parbox large enough to hold all text
+% associated with tag \meta{tag}.  This approach may cause unexpected
+% results if \meta{text} is non-idempotent (i.e.,~has side
+% effects).  For example, if \meta{text} increments a counter, the
+% counter will be incremented twice per invocation of |\eqparbox|.
+%
+%
+% \StopEventually{^^A
+%   \section{Future Work}
+%
+%   The following are some of the features people have requested I implement
+%   in \textsf{eqparbox}:
+%
+%   \begin{itemize}
+%     \item Evalaute \texttt{\string\eqparbox}'s \meta{text} argument
+%       exactly once in case it contains side effects.  Currently,
+%       \meta{text} is evaluated twice: once to determine its natural
+%       size and once to put it in a parbox of the width associated with
+%       the given tag.  (Feature requested by Bernd Schandl.)
+%
+%     \item Get \textsf{eqparbox} to work properly within an
+%       \textsf{algorithmic} environment.  (Feature requested by Mike
+%       Shell.)
+%
+%     \item Support pre-1999 \LaTeXe.  (Feature requested by Mike Shell.)
+%   \end{itemize}
+%
+% One idea I've been toying with that may resolve the first two items in
+% that list is to typeset \meta{text} within a parbox, then check
+% \texttt{\string\badness} to see if the box was too small for
+% \meta{text}.  If not (i.e.,~the box was not overfull), then the
+% initial parbox can be reused directly without needing to re-typeset
+% \meta{text}.  With this approach, \texttt{\string\eqparbox} will work
+% anywhere \texttt{\string\parbox} works.  Unfortunately, I don't know
+% how to get at the \texttt{\string\badness} of the
+% \texttt{\string\hbox}es that comprise the \texttt{\string\vbox}
+% utilized by \texttt{\string\parbox}.  If anyone has a suggestion, I'm
+% all ears.
+%
+%   \PrintChanges
+%   \PrintIndex
+% }
+%
+% \section{Implementation}
+%
+% The one-sentence summary of the implementation is, ``As
+% \textsf{eqparbox} goes along, it keeps track of the maximum width of
+% each box type, and when it's finished, it writes those widths to
+% the~|.aux| file for use on subsequent runs.''  If you're satisfied
+% with that summary, then read no further.  Otherwise, get ready to
+% tackle the following annotated code listing.
+%
+%    \begin{macrocode}
+%<*package>
+%    \end{macrocode}
+%
+% \begin{macro}{\eqp@tempdima}
+% \begin{macro}{\eqp@tempdimb}
+% Define a couple temporary \meta{dimen}s for use in a variety of locations.
+%    \begin{macrocode}
+\newlength{\eqp@tempdima} \newlength{\eqp@tempdimb}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\eqp@taglist}
+% Define a list of all of the tags we encountered in the author's document.
+%    \begin{macrocode}
+\def\eqp@taglist{}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ifeqp@must@rerun}
+% \begin{macro}{\eqp@must@reruntrue}
+% \begin{macro}{\eqp@must@rerunfalse}
+% If an |eqparbox| is wider than the maximum-width |eqparbox| with the
+% same tag, we need to store the new maximum width and request that the
+% user re-run |latex|.  We use |\ifeqp@must@rerun| and |\eqp@must@reruntrue|
+% to assist with this.
+%    \begin{macrocode}
+\newif\ifeqp@must@rerun
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% At the |\end{document}|, for each tag \meta{tag} we see if
+% |\eqp@next@|\meta{tag}, which was initialized to~|0.0pt|, is different
+% from |\eqp@this@|\meta{tag}, which was initialized to the maximum box
+% width from the previous run.  If so, we issue an informational
+% message.  In any case, we initialize the next run's
+% |\eqp@this@|\meta{tag} to |\eqp@next@|\meta{tag} and the next run's
+% |\eqp@next@|\meta{tag} to |0pt|.
+%    \begin{macrocode}
+\AtEndDocument{%
+  \begingroup
+%    \end{macrocode}
+% \begin{macro}{\@elt}
+% The |\eqp@taglist| list is of the form ``|\@elt| |{|\meta{tag$_1$}|}|
+% |\@elt| |{|\meta{tag$_2$}|}|~\ldots''.  We therefore locally define
+% |\@elt| to take the name of a tag and perform all of the checking
+% described above and then merely execute |\eqp@taglist|.
+% \changes{v2.0}{2004/08/01}{Modified to allow numbers in tag names
+%   (suggested by Martin Vaeth)}
+%    \begin{macrocode}
+    \def\@elt#1{%
+      \eqp@tempdima\csname eqp@this@#1\endcsname\relax
+      \eqp@tempdimb\csname eqp@next@#1\endcsname\relax
+      \ifdim\eqp@tempdima=\eqp@tempdimb
+      \else
+        \@latex@warning@no@line{Rerun to correct the width of eqparbox `#1'}%
+      \fi
+      \immediate\write\@auxout{%
+        \string\expandafter\string\gdef\string\csname\space
+        eqp@this@#1\string\endcsname{%
+          \csname eqp@next@#1\endcsname
+        }%
+        ^^J%
+        \string\expandafter\string\gdef\string\csname\space
+         eqp@next@#1\string\endcsname{0pt}%
+      }%
+    }%
+    \eqp@taglist
+  \endgroup
+%    \end{macrocode}
+% We output the generic ``rerun |latex|'' message if we encountered a
+% tag that was not present on the previous run.  (This is always the
+% case on the first run or the first run after deleting the
+% corresponding |.aux| file.
+%    \begin{macrocode}
+  \ifeqp@must@rerun
+    \@latex@warning@no@line{Rerun to correct eqparbox widths}
+  \fi
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\eqp@storefont}
+% \begin{macro}{\eqp@restorefont}
+% To find the natural width of a piece of text, we put it in a table and
+% take the width of that.  The problem is that font changes are not
+% preserved across line breaks (table cells).  We therefore define an
+% |\eqp@storefont| macro which itself defines an |\eqp@restorefont|
+% macro that restores the current font and font size to its current
+% state.
+%    \begin{macrocode}
+\newcommand*{\eqp@storefont}{%
+  \xdef\eqp@restorefont{%
+    \noexpand\usefont{\f@encoding}{\f@family}{\f@series}{\f@shape}%
+    \noexpand\fontsize{\f@size}{\f@baselineskip}%
+    \noexpand\selectfont
+  }%
+}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% The following macro (|\eqp@settowidth|) requires the \textsf{array}
+% package's ability to inject code into every cell.
+%    \begin{macrocode}
+\RequirePackage{array}
+%    \end{macrocode}
+%
+% \begin{macro}{\eqp@settowidth}
+% This macro is just like |\settowidth|, but it puts its argument in a
+% |tabular|, which means that it can contain |\\|.  We use the
+% \textsf{array} package's ``|>|'' and ``|<|'' template parameters to
+% inject an |\eqp@restorefont| at the start of every cell and an
+% |\eqp@storefont| at the end of every cell.  Doing so preserves fonts
+% and font sizes across |\\| boundaries, just like |\parbox|.
+% \changes{v2.0}{2004/08/01}{Modified to store and restore the font
+%   across \texttt{\string\string\string\\}~boundaries (suggested by
+%   Mike Shell)}
+%    \begin{macrocode}
+\newcommand{\eqp@settowidth}[2]{%
+  \settowidth{#1}{{%
+    \eqp@storefont
+    \begin{tabular}{@{}>{\eqp@restorefont}l<{\eqp@storefont}@{}}%
+      #2%
+    \end{tabular}%
+  }}%
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\eqparbox}
+% \begin{macro}{\eqparbox@i}
+% \begin{macro}{\eqparbox@ii}
+% We want |\eqparbox| to take the same arguments as |\parbox|, with the
+% same default values for the optional arguments.  The only difference
+% in argument processing is that |\eqparbox| has a \meta{tag} argument
+% where |\parbox| has \meta{width}.
+%
+% Because |\eqparbox| has more than one optional argument, we can't use
+% a single function defined by |\DeclareRobustCommand|.  Instead, we
+% have to split |\eqparbox| into the following four macros:
+%
+% \begin{description}
+%   \item[\texttt{\string\eqparbox}] Takes zero or more optional arguments.
+%   First optional argument defaults to~|c|.  Calls |\eqparbox@i|.
+%
+%   \item[\texttt{\string\eqparbox@i}] Takes one or more optional arguments.
+%   Second optional argument defaults to~|\relax|.  Calls |\eqparbox@ii|.
+%
+%   \item[\texttt{\string\eqparbox@ii}] Takes two or more optional arguments.
+%   Third optional argument defaults to~|s| if either of the first two
+%   arguments is absent or to the first argument if both are present.
+%   Calls |\eqparbox@iii|.
+%
+%   \item[\texttt{\string\eqparbox@iii}] Takes three optional arguments
+%   and two mandatory arguments.  Does all the work for |\eqparbox|.
+% \end{description}
+%
+% \noindent
+% Note the direct correspondence between these macros and
+% |ltboxes.dtx|'s |\parbox|, |\@iparbox|, |\@iiparbox|, and
+% |\@iiiparbox| macros.
+%    \begin{macrocode}
+\DeclareRobustCommand\eqparbox{%
+  \@ifnextchar[%]
+    {\eqparbox@i}%
+    {\eqparbox@iii[c][\relax][s]}%
+}
+\def\eqparbox@i[#1]{%
+  \@ifnextchar[%]
+    {\eqparbox@ii[#1]}%
+    {\eqparbox@iii[#1][\relax][s]}%
+}
+\def\eqparbox@ii[#1][#2]{%
+  \@ifnextchar[%]
+    {\eqparbox@iii[#1][#2]}%
+    {\eqparbox@iii[#1][#2][#1]}%
+}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\eqparbox@iii}
+% The following function does all the real work for |\eqparbox|.  It takes
+% five parameters---\meta{pos}, \meta{height}, \meta{inner-pos},
+% \meta{tag}, and \meta{text}---and ensures that all boxes with the same
+% tag will be as wide as the widest box with that tag.
+%
+% To keep track of box widths, |\eqparbox| makes use of two global
+% variables for each tag: |\eqp@this@|\meta{tag} and
+% |\eqp@next|\meta{tag}.  |\eqp@this@|\meta{tag} is the maximum width
+% ever seen for tag \meta{tag}, including in previous |latex| runs.
+% |\eqp@next@|\meta{tag} works the same way but is always initialized
+% to~|0.0pt|.  It represents the maximum width to assume in
+% \emph{subsequent} |latex| runs.  It is needed to detect whether the
+% dest text with tag \meta{tag} has been removed/shrunk.  At the end of
+% a run, \textsf{eqparbox} prepares the next run (via the~|.aux| file)
+% to initialize |\eqp@this@|\meta{tag} to the final value of
+% |\eqp@next@|\meta{tag}.
+% \changes{v2.0}{2004/07/30}{Removed extraneous \texttt{\string\string\string\global}s
+%   (suggested by David Kastrup)}
+%    \begin{macrocode}
+\def\eqparbox@iii[#1][#2][#3]#4#5{%
+  \eqp@settowidth{\eqp@tempdimb}{#5}%
+  \expandafter
+  \ifx\csname eqp@this@#4\endcsname\relax
+%    \end{macrocode}
+% If we get here, then we've never encountered tag \meta{tag}, even in a
+% previous |latex| run.  We request that the user re-run |latex| This is
+% not always necessary (e.g., when all uses of the |\eqparbox| with tag
+% \meta{tag} are left-justified), but it's better to be safe than sorry.
+%    \begin{macrocode}
+    \global\eqp@must@reruntrue
+    \expandafter\xdef\csname eqp@this@#4\endcsname{\the\eqp@tempdimb}%
+    \expandafter\xdef\csname eqp@next@#4\endcsname{\the\eqp@tempdimb}%
+  \else
+%    \end{macrocode}
+% If we get here, then we \emph{have} previously seen tag \meta{tag}.
+% We just have to keep track of the maximum text width associated with
+% it.
+%    \begin{macrocode}
+    \eqp@tempdima=\csname eqp@this@#4\endcsname\relax
+    \ifdim\eqp@tempdima<\eqp@tempdimb
+      \expandafter\xdef\csname eqp@this@#4\endcsname{\the\eqp@tempdimb}%
+      \global\eqp@must@reruntrue
+    \fi
+%    \end{macrocode}
+%    \begin{macrocode}
+    \eqp@tempdima=\csname eqp@next@#4\endcsname\relax
+    \ifdim\eqp@tempdima<\eqp@tempdimb
+      \expandafter\xdef\csname eqp@next@#4\endcsname{\the\eqp@tempdimb}%
+    \fi
+  \fi
+%    \end{macrocode}
+%
+% The first time we encounter tag \meta{tag} in the current document we
+% ensure \LaTeX{} will notify the user if he needs to re-run |latex| on
+% account of that tag.
+%    \begin{macrocode}
+  \@ifundefined{eqp@seen@#4}{%
+    \expandafter\gdef\csname eqp@seen@#4\endcsname{}%
+    \@cons\eqp@taglist{{#4}}%
+  }{}%
+%    \end{macrocode}
+%
+% Finally, we can call |\parbox|.  We pass it \meta{pos}, \meta{height},
+% \meta{inner-pos}, and \meta{text} directly, and we pass it
+% |\eqp@this@|\meta{tag} for its \meta{width} argument.
+%    \begin{macrocode}
+  \eqp@tempdima=\csname eqp@this@#4\endcsname\relax
+  \parbox[#1][#2][#3]{\eqp@tempdima}{#5}%
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\eqboxwidth}
+% For the times that the user wants to make something other than a box
+% match an |\eqparbox|'s width, we provide |\eqboxwidth|.  |\eqboxwidth|
+% returns the width of a box corresponding to a given tag.  More
+% precisely, if |\eqp@this@|\meta{tag} is defined, it's returned.
+% Otherwise,~|0pt| is returned.
+% \changes{v2.1}{2004/08/02}{Rewrote so as to be compatible with the
+%   \textsf{calc} package's \texttt{\string\string\string\setlength}
+%   command (problem initially reported by Gary L. Gray and narrowed
+%   down by Martin Vaeth)}
+%    \begin{macrocode}
+\newcommand*{\eqboxwidth}[1]{%
+  \@ifundefined{eqp@this@#1}{0pt}{\csname eqp@this@#1\endcsname}%
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \DeleteShortVerb{\|}
+% \MakeShortVerb{\!}
+% \paragraph{Per-tag memory usage}
+% The \textsf{eqparbox} package defines three macros for each unique
+% tag: !\eqp@this@!\meta{tag}, !\eqp@next@!\meta{tag}, and
+% !\eqp@seen@!\meta{tag}.  Consequently, each unique tag subtracts three
+% strings from \TeX's string pool and three multiletter control
+% sequences from that pool.  In addition, each unique tag \meta{tag}
+% subtracts $|!\eqp@this@!| + |\meta{tag}| + |!\eqp@next@!| +
+% |\meta{tag}| + |!\eqp@seen@!| + |\meta{tag}| = 27 + 3 \times
+% |\meta{tag}|$ string characters from \TeX's pool of string characters.
+% For example, a document that invokes !\eqparbox!  with tags
+% ``!hello!'' and ``!goodbye!'' will utilize $3 \times 2 = 6$ strings,
+% $3 \times 2 = 6$ multiletter control sequences, and $(27 + 3 \times 5)
+% + (27 + 3 \times 7) = 90$ \TeX{} string characters.
+% \DeleteShortVerb{\!}
+% \MakeShortVerb{\|}
+%
+%    \begin{macrocode}
+%</package>
+%    \end{macrocode}
+%
+% \Finale
+%
diff --git a/Master/texmf-dist/source/latex/eqparbox/eqparbox.ins b/Master/texmf-dist/source/latex/eqparbox/eqparbox.ins
new file mode 100644
index 00000000000..7fa1304eef1
--- /dev/null
+++ b/Master/texmf-dist/source/latex/eqparbox/eqparbox.ins
@@ -0,0 +1,55 @@
+%%
+%% This file will generate fast loadable files and documentation
+%% driver files from the doc files in this package when run through
+%% LaTeX or TeX.
+%%
+%% Copyright (C) 2004 Scott Pakin <scott+eqp@pakin.org>
+%% -------------------------------------------------------
+%% 
+%% This package may be distributed and/or modified under the
+%% conditions of the LaTeX Project Public License, either version 1.2
+%% 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 1.2 or later is part of all distributions of LaTeX 
+%% version 1999/12/01 or later.
+%%
+%% --------------- start of docstrip commands ------------------
+%%
+\input docstrip
+
+\keepsilent
+
+\usedir{tex/latex/eqparbox}
+
+\preamble
+
+This is a generated file.
+
+Copyright (C) 2004 Scott Pakin <scott+eqp@pakin.org>
+-------------------------------------------------------
+
+This package may be distributed and/or modified under the
+conditions of the LaTeX Project Public License, either version 1.2
+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 1.2 or later is part of all distributions of LaTeX 
+version 1999/12/01 or later.
+
+\endpreamble
+
+\generate{\file{eqparbox.sty}{\from{eqparbox.dtx}{package}}}
+
+\Msg{***********************************************************}
+\Msg{*}
+\Msg{* To finish the installation, you have to move}
+\Msg{* eqparbox.sty into a directory searched by TeX.}
+\Msg{*}
+\Msg{* To produce the documentation, run eqparbox.dtx}
+\Msg{* through LaTeX.}
+\Msg{*}
+\Msg{* Happy TeXing!}
+\Msg{***********************************************************}
+
+\endbatchfile