%% 
%%  A DANTE-Edition example
%% 
%%  Example 28-02-30 on page 543.
%% 
%%  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{201.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks,pst-func}

\begin{document}
\psset{xunit=8cm,yunit=3cm}
\begin{pspicture*}(-0.1,-0.2)(1.1,2.10)
 \multido{\rbeta=0.25+0.25,\iblack=0+5}{20}{%
   \psBetaDist[linewidth=1pt,beta=\rbeta,linecolor=black!\iblack]{0.01}{0.99}}
 \psaxes[Dy=0.2,Dx=0.1]{->}(0,0)(1,2.01)
\end{pspicture*}
\end{document}