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\usepackage {pstcol}
\begin{pspicture}(0,0)(2,1)\showgrid
\pscustom{%
\pscurve(0,.6)(1,.9)(2,.6)
\gsave
\pscurve[liftpen=1](2,.4)(1,.1)(0,.4)
\fill[fillstyle=solid,fillcolor=lightgray]
\grestore
}
\pscurve[liftpen=2](2,.4)(1,.1)(0,.4)
\end{pspicture}
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