%% 
%%  A DANTE-Edition example
%% 
%% 
%%  Copyright (C) 2011 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[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}

\usepackage{pst-tree}
\SpecialCoor

\begin{document}
\psset{nodesep=5pt}
\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}
