%% 
%%  A DANTE-Edition example
%% 
%%  Example 27-03-1 on page 514.
%% 
%%  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{177.70511pt}
\setlength\parindent{0pt}
\usepackage{filecontents}
\begin{filecontents*}{data2T.csv}
1, 0.5, 2, 0.5
1, 2, 1.5, 1
\end{filecontents*}

\usepackage{pstricks,pst-bar,pst-grad}

\begin{document}
\newpsbarstyle{rG}{fillstyle=gradient,
  gradangle=0,gradbegin=red,gradend=white}
\newpsbarstyle{bG}{fillstyle=gradient,gradangle=0,
  gradbegin=blue,gradend=white}
\begin{pspicture}(-0.5,-0.1)(4,4)
 \psaxes[axesstyle=frame,Ox=0,Dx=1,Dy=2,
   labels=y,ticks=y](0,0)(4,4)
 \readpsbardata[header=false]{\data}{data2T.csv}
 \psbarchart[barstyle={rG,bG},chartstyle=stack]{\data}
\end{pspicture}
\end{document}
