%% 
%%  A DANTE-Edition example
%% 
%%  Example 36-00-5 on page 770.
%% 
%%  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-math,pstricks-add}
\makeatletter
\def\psGaussFill{\pst@object{psGaussFill}}
\def\psGaussFill@i(#1,#2)(#3,#4)#5#6{{%
  \pst@killglue
  \use@par
  \pscustom[linestyle=none,opacity=0.5,strokeopacity=0.5]{%
    \psline(#4,0)(#3,0)
    \psplot[liftpen=1]{#3}{#4}{x #5 #6 GAUSS}%
  }%
  \psplot[fillstyle=none]{#1}{#2}{x #5 #6 GAUSS}%
}\ignorespaces}
\makeatother

\begin{document}
\psset{yunit=7.5cm, xunit=2cm}
\begin{pspicture}(-4,-0.06)(4,0.6)
  \psaxes[dy=0.2,Dy=0.2,linewidth=0.5pt]{->}(0,0)(-3.5,-0.1)(3.5,0.5)
  \psset{fillstyle=solid,plotpoints=100,linewidth=1pt}
  \psGaussFill[fillcolor=red](-3,3)(-2,-1.25){0}{0.9}
  \psGaussFill[fillcolor=blue](-3,3)(.5,1.5){0.5}{0.9}
  \psGaussFill[fillcolor=red,linestyle=none](-3,-1)(-2,-1.25){0}{0.9}
\end{pspicture}
\end{document}