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+%%
+%% A DANTE-Edition example
+%%
+%% Example 16-03-5 on page 238.
+%%
+%% 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{129.70511pt}
+\setlength\parindent{0pt}
+
+\usepackage{pstricks,pst-node}\SpecialCoor
+\makeatletter \def\nodeBetween(#1)(#2)#3{%
+ \pst@getcoor{#1}\pst@tempa\pst@getcoor{#2}\pst@tempb
+ \pnode(! \pst@tempa /YA exch \pst@number\psyunit div def
+ /XA exch \pst@number\psxunit div def
+ \pst@tempb /YB exch \pst@number\psyunit div def
+ /XB exch \pst@number\psxunit div def
+ XB XA add 2 div YB YA add 2 div){#3}}\makeatother
+
+\begin{document}
+\begin{pspicture}[showgrid](3,2)
+\psline[linestyle=dashed]{o-o}(0.25,0.33)(2.333,2)
+\nodeBetween(0.25,0.33)(2.333,2){centre}\pscircle*(centre){3pt}
+\end{pspicture}
+\end{document}