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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{129.70511pt}
+\setlength\parindent{0pt}
+\AtBeginDocument{%
+ \psset{mathLabel=false,labelFontSize=\small}}
+
+\usepackage{pst-plot}
+
+\begin{document}
+\psset{xunit=0.02cm,yunit=3cm}
+\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}