%% 
%%  Ein Beispiel der DANTE-Edition
%% 
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  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.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{166.324pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pstricks}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}(3,1.6)
  \psset{arrowscale=3}% nur für Demo relevant
  \psline{<<-]}(0,1.5)(3,1.5)
  { \psset{arrows=->}\psline{->>}(0,.75)(3,.75) }
  \psline[arrows=->]{<-}(3,0)
\end{pspicture}
\end{document}