%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
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%%  Beispiel 32-05-31 auf Seite 798.
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%%  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
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{145.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pst-knot}
%StopShownPreambleCommands
\begin{document}
\begin{pspicture}(-2,-2)(6,2)
 \psframe[fillcolor=black!20,
   fillstyle=solid](-1.9,-2)(5.9,2)
 \psKnot[linewidth=5pt,linecolor=red!50](0,0){7-4}
 \psKnot[linewidth=5pt,linecolor=red!50,
    knotbgcolor=black!20](4,0){7-4}
\end{pspicture}
\end{document}