\centerline{
\beginpicture
\setcoordinatesystem units <1mm,1mm>
\setlinear
%
\setdots <1mm>
\setlinear
\plot 0 0  60 20  /
\put {$\bullet$} at 0 0
\put {$A_1$} [rt] at -1 0
\put {$\bullet$} at 60 20
\put {$E_n$} [lt] at 61 20
\setquadratic
\plot 0 0   30 20  60 20 /
\setlinear
\plot 30 10  30 16 /
\put {$\epsilon$} [rb] at 29 11
\setdots
\plot 0 6 60 26 /
%
\endpicture
}

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