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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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+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 only
+//draw(surface(f,(0,0),(2pi,2pi),30,15));
+
+// mesh only
+//draw(surface(f,(0,0),(2pi,2pi),30,15),nullpen,meshpen=p);
+
+// surface & mesh
+draw(surface(f,(0,0),(2pi,2pi),30,15),lightgray,meshpen=p);