%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 6-3-34 on page 381.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  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.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{159.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-tree}
\StopShownPreambleCommands
\begin{document}
\Huge\pstree[treesep=0.3cm,radius=3pt,%
    tnheight=0pt]{\Tc{3pt}}{%
  \TC~{X}
  \TC~{x}
  \TC~{\_}
  \TC~{\footnotesize a}
  \TC~{g}}
\end{document}