/usr/share/doc/texlive-doc/latex/latex-graphics-companion/4-6-6.inl

\usepackage {pstricks}
\begin{pspicture}(-.2,-.5)(3,1)\showgrid
\psset{radius=.3}
\Cnode(.5,.5){A}
\Cnode(2.5,.5){B}
\ncline{A}{B}
\end{pspicture}

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