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%%
%% 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{375.57637pt}
\setlength\parindent{0pt}
\usepackage{pstricks,pst-coil,pst-node}
\SpecialCoor
\begin{document}
\begin{pspicture}(-2,-2)(2,2)
\pscircle{2}
\pnode(2;-90){O}
\pnode(2;10){A}\pnode(2;60){B}
\pnode(2;190){C}\pnode(2;-60){D}
\qdisk(A){3pt}\qdisk(B){3pt}
\qdisk(C){3pt}\qdisk(D){3pt}
\nccoil[coilarm=3mm,coilwidth=3mm,linecolor=red]{-}{O}{A}
\nccoil[coilarm=3mm,coilwidth=3mm,coilheight=1.4,linecolor=red]{-}{O}{B}
\nccoil[coilarm=3mm,coilwidth=3mm,coilheight=.9,linecolor=red]{-}{O}{C}
\nccoil[coilarm=3mm,coilwidth=3mm,coilheight=.5,linecolor=red]{-}{O}{D}
\rput(1.6,-.4){$m$}
\rput(.8,-1){$k$}
\psline[linecolor=blue,linewidth=1.5pt]{<-}(-2,0)(0,0)
\rput(-1,.2){$r$}
\end{pspicture}
\end{document}
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