%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
%% 
%%  Beispiel 26-02-7 auf Seite 553.
%% 
%%  Copyright (C) 2016 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
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%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{145.16928pt}
\setlength\parindent{0pt}
\usepackage{filecontents}
\begin{filecontents*}{data2T.csv}
1, 0.5, 2, 0.5
1, 2, 1.5, 1
\end{filecontents*}
%StartShownPreambleCommands
\usepackage{pst-bar}
%StopShownPreambleCommands
\begin{document}
\readpsbardata[header=false]{\data}{data2T.csv}
\begin{pspicture}(-0.5,-0.1)(4,2)
  \psbarchart[barsep=0.05,barstyle={red,green},
    chartstyle=cluster]{\data}
\end{pspicture}

\begin{pspicture}(-0.5,-0.1)(4,2)
  \psbarchart[barsep=0.2,barstyle={red,green},
    chartstyle=cluster]{\data}
\end{pspicture}
\end{document}