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+%% 
+%%  A DANTE-Edition example
+%% 
+%% 
+%%  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[]{article}
+\pagestyle{empty}
+\setlength\textwidth{201.70511pt}
+\setlength\parindent{0pt}
+
+\usepackage{pstricks,pst-plot,pst-xkey,multido}
+\makeatletter
+\pst@addfams{user}
+\define@key[psset]{user}{nLoop}{\def\psnLoop{#1}}
+\psset[user]{nLoop=1}
+\makeatother
+\def\chooseColor#1{%
+  \ifcase#1\or red\or green\or blue\or cyan\or magenta\or gray\fi}
+
+\begin{document}
+\psset{xunit=1.5mm,yunit=3mm}
+\begin{pspicture}(-45,0)(45,20)
+  \psaxes[Dy=10,Dx=15]{->}(0,0)(-45,0)(45,20)%
+  \psset{linewidth=1pt}%
+  \pstVerb{%
+     /dc 0.2 def
+     /kx 12 def
+     /ky 12 def
+     /pi 3.141529 def
+     /rad2deg { 57.296 mul } def
+     /si { pi mul dup rad2deg sin exch div } def
+     /Func {
+       /nLoop exch def
+       x kx mul nLoop mul cos
+       nLoop dc mul si mul
+     } def
+  }%
+  \psset{plotpoints=400,linecolor=red,plotstyle=curve}%
+  \multido{\iA=1+1}{6}{%
+    \psplot[linecolor=\chooseColor\iA,nLoop=\iA]{-45}{45}{%
+      /y0 x kx mul cos dc si mul def
+      /y1 0 def
+      1 1 \psnLoop {
+        Func y1 add /y1 exch def
+      } for
+      y1 y0 add
+      dc mul 2 mul
+      dc add
+      ky mul
+    }%
+  }%
+\end{pspicture}
+\end{document}