%% 
%%  Ein Beispiel der DANTE-Edition
%% 
%% 
%%  Copyright (C) 2010 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[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{190.324pt}
\setlength\parindent{0pt}
\begin{filecontents*}{dataError.dat}
-0.7  -0.4      0.1 0.5
-0.43  3        0   0.4
 1     4.6     -0.5 0.2
 1.2   2.3     -0.2 0.2
 1.7   3.9     -0.1 1
 2.7  -1.1     -0.2 0.3
 3.98 -0.7     -0.4 0
 4.5   0.7539  -0.5 0.4
\end{filecontents*}

\StartShownPreambleCommands
\usepackage{pst-plot}
\SpecialCoor\makeatletter
\def\errorLine{\@ifnextchar[{\pst@errorLine}{\pst@errorLine[]}}
\def\pst@errorLine[#1](#2)#3#4{{%
  \def\pst@tempa{#1}\ifx\pst@tempa\@empty\else\psset{#1}\fi
  \pst@getcoor{#2}\pst@tempb
  \psline{|-|}(!\pst@tempb\space pop \pst@number\psxunit div
    \pst@tempb\space exch pop \pst@number\psyunit div #3\space add)
  (!\pst@tempb\space pop \pst@number\psxunit div
    \pst@tempb\space exch pop \pst@number\psyunit div #4\space add )}}
\def\GetCoordinates#1{\expandafter\GetCoordinates@i#1}
\def\GetCoordinates@i #1{\GetCoordinates@ii#1}
\def\GetCoordinates@ii#1 #2 #3 #4 #5 #6 #7 #8 {%
  \DoCoordinate{#2}{#4}\errorLine[linecolor=red,linewidth=1.5pt](#2,#4){#6}{#8}% <<<<<
  \@ifnextchar D{\GetCoordinates@ii}{}}
\makeatother
\StopShownPreambleCommands
\begin{document}
\readdata{\Data}{dataError.dat}\psset{dotscale=2,yunit=0.7}%
\begin{pspicture}(-1,-2)(5,5.5)
  \psaxes(0,0)(-1,-2)(5,5)\def\DoCoordinate#1#2{\psdot(#1,#2)}\GetCoordinates{\Data}
\end{pspicture}
\end{document}