%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
%% 
%%  Beispiel 16-02-2 auf Seite 305.
%% 
%%  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
%% 
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\setlength\parindent{0pt}
\AtBeginDocument{\Large}
%StartShownPreambleCommands
\usepackage{pst-tree}
%StopShownPreambleCommands
\begin{document}
\pstree[linewidth=0.2pt,nodesepB=3pt]{\TC*}{%
   \Tr{a\rlap{\rule{3cm}{0.4pt}}}\Tr{$\hat{X}$}\Tr{b}\Tr{x}} \qquad
\pstree[linewidth=0.2pt,nodesepB=3pt]{\TC*}{%
   \TR{a\rlap{\rule{3cm}{0.4pt}}}\TR{$\hat{X}$}\TR{b}\TR{x}}
\end{document}
