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+% File: chemarr.sty
+% Version: 2001/06/22 v1.1
+% Author: Heiko Oberdiek
+% Email: <oberdiek@uni-freiburg.de>
+%
+% Copyright: Copyright (C) 2001 Heiko Oberdiek.
+%
+% This program 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.
+%
+% Function: Very often chemists need a longer version
+% of reaction arrows (\rightleftharpoons) with
+% the possibility to put text above and below.
+% Analogous to amsmath's \xrightarrow and
+% \xleftarrow this package provides the macro
+% \xrightleftharpoons.
+%
+% Requirement: amsmath
+% Use: LaTeX: \usepackage{chemarr}
+% \xrightleftharpoons[below]{above}
+%
+% History: 2001/06/21 v1.0:
+% * first public version
+% 2001/06/22 v1.1:
+% * documentation fixes
+%
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{chemarr}%
+ [2001/06/22 v1.1 Chemical reaction arrows (HO)]
+%
+\RequirePackage{amsmath}
+% The package amsmath is needed for the following commands:
+% \ext@arrow, \@ifnotempty, \arrowfill@
+% \relbar, \std@minus
+% \@ifempty, \@xifempty, \@xp
+%
+% In fontmath.ltx \rightleftharpoons is defined with
+% a vertical space of 2pt.
+%
+\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}}%
+ $%
+ }%
+ }%
+ }%
+ }%
+}
+\newcommand*{\leftharpoondownfill@}{%
+ \arrowfill@\leftharpoondown\relbar\relbar
+}
+\newcommand*{\rightharpoonupfill@}{%
+ \arrowfill@\relbar\relbar\rightharpoonup
+}
+\endinput