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diff --git a/Master/texmf/doc/asymptote/examples/parametricsurface.asy b/Master/texmf/doc/asymptote/examples/parametricsurface.asy
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--- a/Master/texmf/doc/asymptote/examples/parametricsurface.asy
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-import graph3;
-
-size(200,0);
-currentprojection=orthographic(4,0,2);
-
-real R=2;
-real a=1.9;
-
-triple f(pair t) {
- return ((R+a*cos(t.y))*cos(t.x),(R+a*cos(t.y))*sin(t.x),a*sin(t.y));
-}
-
-pen p=rgb(0.2,0.5,0.7);
-surface s=surface(f,(0,0),(2pi,2pi),8,8,Spline);
-
-// surface only
-//draw(s,lightgray);
-
-// mesh only
-// draw(s,nullpen,meshpen=p);
-
-// surface & mesh
-draw(s,lightgray,meshpen=p,render(merge=true));