%% 
%%  A DANTE-Edition example
%% 
%%  Example 08-00-1 on page 91.
%% 
%%  Copyright (C) 2011 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[]{article}
\pagestyle{empty}
\setlength\textwidth{153.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks}

\begin{document}
\begin{pspicture}(3,1.6)
  \psset{arrowscale=3}% only relevant for demo
  \psline{<<-]}(0,1.5)(3,1.5)
  { \psset{arrows=->}\psline{->>}(0,0.75)(3,0.75) }
  \psline[arrows=->]{<-}(3,0)
\end{pspicture}
\end{document}