%%
%% This is the original source file superpose.sty
%%
%% Package `superpose' to use with LaTeX 2e
%% Copyright Roberto Di Cosmo, Jun Furuse, Didier Remy, and Pierre Weis
%% All rights reserved.

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{superpose}
         [2001/29/08 v0.40 supperpose Package]

%% Superpose
%% Identification
%% Preliminary declarations

\newif \ifsuper@first

%% Options

\DeclareOption{first}{\super@firsttrue}
\ProcessOptions

%% More declarations

\RequirePackage {keyval}

%% exports

\newdimen \super@dima
\newdimen \super@dimb

\def \super@store 
  {\ifnum \ht0>\super@dima \global \super@dima\ht0\fi
   \ifnum \dp0>\super@dimb \global \super@dimb\dp0\fi}
\let \super@left \hfil
\let \super@right \hfil
\def \super@empty {}
\def \super@l@ {\let \super@left \super@empty}
\def \super@r@ {\let \super@right \super@empty}
\let \super@c@ \super@empty
\let \super@math \super@empty
\let \super@cr \cr
\newif \ifsuper@ignore
\let \super@ignore \relax

\newenvironment{superpose}[1][c]%
  {\ifmmode \let \super@math$\fi 
   \hbox \bgroup \@tempdima \super@dima  \@tempdimb \super@dimb
     \let \super@ignore@if  \ifsuper@ignore
     \vbox \bgroup
       \@ifundefined {super@#1@}%
          {\PackageError {Superpose}{Unknown Preamble #1}{}}%
          {\@nameuse {super@#1@}}%
       \offinterlineskip \super@dima 0em \super@dimb \super@dima 
       \super@ignorefalse
       \let \\\super@cr \halign \bgroup
         \super@left 
           \setbox0\hbox{\super@math ##\super@math}\super@store
            \ifsuper@first
                 \ifsuper@ignore  \setbox0 \null \else
                 \global \super@ignoretrue \fi \fi
           \ht0 0em\dp0 0em\mbox{\box0}%
         \super@right\cr}
  {\crcr \egroup \super@dima \@tempdima \super@dima \@tempdimb 
     \let \ifsuper@ignore  \super@ignore@if \egroup
   \vbox {\vskip \super@dima}\vtop {\vskip \super@dimb}\egroup}