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+%% 
+%%  A DANTE-Edition example
+%% 
+%%  Example 15-03-3 on page 206.
+%% 
+%%  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{375.57637pt}
+\setlength\parindent{0pt}
+\AtBeginDocument{%
+  \psset{mathLabel=false,labelFontSize=\small}}
+
+\usepackage{pst-plot} \psset{xunit=0.02cm,yunit=3cm}
+
+\begin{document}
+\begin{pspicture}(-0.1,-0.1)(190,1.1)
+ \psgrid[subgriddiv=0,griddots=5,gridlabels=0pt,xunit=30,yunit=0.2](6,5)
+ \psaxes[linewidth=1pt,ticks=none,Dx=30,Dy=0.2]{->}(190,1.1)%
+    [$\mathbf{\alpha}$,0][$\mathbf{I/I_0}$,90]
+ \psplot[linewidth=1.5pt,algebraic,xunit=57.325]{0}{Pi}{sqrt(1-x/Pi+sin(2*x)/(2*Pi))}
+ \psplot[linewidth=1.5pt,linestyle=dashed]{90}{180}{
+    2 x 90 div sub x 2 mul cos 2 add mul x 2 mul sin 3 3.15 div mul add abs sqrt}
+ \rput*(40,0.85){$\varphi=0$}  \rput*(125,0.9){$\varphi=\pi/2$}
+\end{pspicture}
+\end{document}