/usr/share/doc/texlive-doc/latex/latex-graphics-companion/4-2-3.inl

\usepackage {pstcol}
\begin{pspicture}(0,0)(1,2)\showgrid
\psset{xunit=.5cm,yunit=2cm}
\psline(0,0)(1,1)
\end{pspicture}

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