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%%
%% This is file `chemarr-example.tex',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% chemarr.dtx  (with options: `example')
%% 
%% This is a generated file.
%% 
%% Project: chemarr
%% Version: 2016/05/16 v1.3
%% 
%% Copyright (C)
%%    2001, 2006 Heiko Oberdiek
%%    2016-2019 Oberdiek Package Support Group
%% 
%% 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
%%    https://www.latex-project.org/lppl/lppl-1-3c.txt
%% and the latest version of this license is in
%%    https://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".
%% 
%% The Current Maintainers of this work are
%% Heiko Oberdiek and the Oberdiek Package Support Group
%% https://github.com/ho-tex/oberdiek/issues
%% 
%% 
%% 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.
%% 
\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}
\endinput
%%
%% End of file `chemarr-example.tex'.