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+%% 
+%%  A DANTE-Edition example
+%% 
+%% 
+%%  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{201.70511pt}
+
+\usepackage{pst-plot,pst-tree}
+\SpecialCoor
+\def\drawseg#1#2{% Michael Sharpe
+\pscustom{%
+ \translate(#1,#2)
+ \rotate{(\dirseg{#1}{#2})}  % Vector in direction of field at x=#1,y=#2
+\psline(-.25,0)(.25,0)}}
+%
+\def\dirseg#1#2{-#2,#1}
+
+\begin{document}
+\begin{pspicture}(-6,-6)(6,6)
+ \psaxes{->}(0,0)(-5.5,-5.5)(5.5,5.5)
+ \psset{arrows=->}
+ \multido{\n=-5+1}{11}{%
+   \multido{\N=-5+1}{11}{%
+     \ifnum\N=0 \ifnum\n=0 \else\drawseg{\n}{\N}\fi
+     \else\drawseg{\n}{\N}\fi}}
+\end{pspicture}
+\end{document}