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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%%
+%% Copyright (C) 2010 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[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{190.324pt}
+\setlength\parindent{0pt}
+\StartShownPreambleCommands
+\usepackage{pst-electricfield}
+\StopShownPreambleCommands
+\begin{document}
+\begin{pspicture*}(-10,-5)(6,5)
+ \psgrid[subgriddiv=0,gridcolor=lightgray,griddots=10]
+ \psElectricfield[Q={[600 -60 0 false][-4 0 0] },N=50,points=500,runit=0.8]
+ \psEquipotential[Q={[600 -60 0 false][-4 0 0]},linecolor=blue,Vmax=100,
+ Vmin=50,stepV=2](-10,-5)(6,5)
+ \psframe*(-10,-5)(-9.5,5)
+ \rput(0,0){\textcolor{white}{\large$-$}}
+ \multido{\rA=4.75+-0.5}{20}{\rput(-9.75,\rA){\textcolor{white}{\large$+$}}}
+\end{pspicture*}
+\end{document}