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verbatimtex
\documentclass{article}
\usepackage{palatino}
\usepackage{concmath}
\usepackage{ccfonts}
\begin{document}
etex
beginfig(1);
numeric u, dist, desv, rayf, aux;
u = 1cm;
dist = 2u;
desv = 1.5u;
rayf = 1.2;
ahangle := 30;
aux = (rayf-1.0)*u;
z1 = (dist,desv);
z2 = (dist,-0.5u);
z3 = (dist-aux,0.33*desv);
z4 = (dist-aux,0.67*desv);
drawdblarrow origin--(dist,0);
drawarrow subpath (1,2) of fullcircle scaled (rayf*u);
drawarrow z3--z4;
pickup pencircle scaled 2pt;
draw fullcircle scaled u;
pickup pencircle scaled 5pt;
draw z2--z1 withcolor 0.5white;
label.urt(btex $i_2$ etex, (0,0.5*rayf*u) );
label.llft(btex $i_1$ etex, z4 );
label.top(btex $l$ etex, (0.5*dist,0) );
endfig;
verbatimtex
\end{document}
etex
end.
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