/usr/share/doc/texlive-doc/latex/latex-graphics-companion/4-2-1.inl

\usepackage {pstcol}
\begin{pspicture}(0,0)(2,2)\showgrid
\psline[linewidth=1pt,linecolor=gray]
   {<->}(0.5,0)(0,1)(1,1.5)(1.5,1)(.5,.5)
\end{pspicture}

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