%% 
%%  A DANTE-Edition example
%% 
%%  Example 33-03-33 on page 704.
%% 
%%  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}

\usepackage{pst-diffraction}

\begin{document}
\begin{pspicture}(-3,-3)(3,3)
\psdiffractionRectangle[f=2.5]
\end{pspicture}\quad
\begin{pspicture*}(-3,-3)(3,3)
\psdiffractionRectangle[f=4,lambda=550,colorMode=0]
\end{pspicture*}
\end{document}