%% 
%%  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.
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%% 
%% ==== 
% Show page(s) 1
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{190.324pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pst-tree} \SpecialCoor \psset{nodesep=5pt}
\StopShownPreambleCommands
\begin{document}
\pstree[treemode=R,levelsep=3cm]{\rnode{A}{}\Tr{\rnode{A}{}Friedrich Wilhelm}}{%
  \pstree{\Tr{Friedrich I.}}{\Tr{\rnode{C}{}Friedrich Wilhelm I.} \Tr{Friedrich}}
  \pstree{\Tr{\rnode{B}{}Albrecht Friedrich}}{\Tr{Wilhelm Heinrich} \Tr{Friedrich}}}
\psset{arrowscale=2,linewidth=0.2pt}
\pcline[linestyle=dashed](A)(A|0,-1)\pcline[linestyle=dashed](B)(B|0,-1)
\pcline[linestyle=dashed](C)(C|0,-1)\pnode(A|0,-0.8){A1}\pnode(B|0,-0.8){A2}
\ncline[arrows=<->]{A1}{A2}\ncput*{\texttt{levelsep}}
\pnode(C|0,-0.8){A3}\ncline[arrows=<->]{A2}{A3}\ncput*{\texttt{levelsep}}
\end{document}