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\psset{linecolor=lightgray}
\pstextpath
{\pscurve(-4,-2)(-2,0)(0,-3)(2,-1)(3,-3)}
{\color{blue} If you
want to type $2=\int_0^\pi \sin\theta\,
\mathrm{d}\theta$ and let it follow
along a curving line \ldots}
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