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diff --git a/Master/texmf/doc/asymptote/examples/spiral3.asy b/Master/texmf/doc/asymptote/examples/spiral3.asy
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-import graph3;
-import palette;
-
-size3(10cm);
-
-currentprojection=orthographic(5,4,2);
-viewportmargin=(2cm,0);
-
-real r(real t) {return 3exp(-0.1*t);}
-real x(real t) {return r(t)*cos(t);}
-real y(real t) {return r(t)*sin(t);}
-real z(real t) {return t;}
-
-path3 p=graph(x,y,z,0,6*pi,50,operator ..);
-
-tube T=tube(p,2);
-surface s=T.s;
-s.colors(palette(s.map(zpart),BWRainbow()));
-draw(s,render(merge=true));
-draw(T.center,thin());