%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 6-2-37 on page 351.
%%
%% Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See
http://www.latex-project.org/lppl.txt for details.
%%
\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-node}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}(2,2)\psgrid[subgriddiv=2]
\cnode(0.25,1.75){0.25cm}{A} \cnode(1.75,0.25){0.25cm}{B}
\cnode(1.75,1.75){0.25cm}{C} \cnode(0.25,0.25){0.25cm}{D}
\ncline[nodesep=0.25]{<->}{A}{B}
\ncline[Ynodesep=0.25]{<->}{C}{D}
\end{pspicture}
\end{document}
