%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
%% 
%%  Beispiel 15-04-7 auf Seite 274.
%% 
%%  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{145.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pst-node}
%StopShownPreambleCommands
\begin{document}
\begin{pspicture}(4,6)
 \circlenode{A}{A}\quad\circlenode{C}{C}%
 \quad\circlenode{E}{E}
 \rput(0.5,4){\circlenode{B}{B}}
 \rput(1.5,5){\circlenode{D}{D}}
 \rput(2.5,6){\circlenode{F}{F}}
 \psset{arrowscale=2,linearc=0.2,
    linecolor=red,armA=0.5,angleA=90}
 \ncdiagg[lineAngle=-160]{->}{A}{B}\ncput*[nrot=:U]{line I}
 \ncdiagg[lineAngle=-160]{->}{C}{D}\ncput*[nrot=:U]{line II}
 \ncdiagg[lineAngle=-160]{->}{E}{F}\ncput*[nrot=:U]{line III}
\end{pspicture}
\end{document}