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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}
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