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- x(u,v)= v<pi ? (2.5-1.5*cos(v))*cos(u): \
- v<2*pi ? (2.5-1.5*cos(v))*cos(u):\
- v<3*pi ? -2+(2+cos(u))*cos(v): -2+2*cos(v)-cos(u)
- y(u,v)= v<pi ? (2.5-1.5*cos(v))*sin(u): \
- v<2*pi ? (2.5-1.5*cos(v))*sin(u): \
- v<3*pi ? sin(u): sin(u)
- z(u,v)= v<pi ? -2.5*sin(v): v < 2*pi ? 3*v-3*pi:\
- v<3*pi ? (2+cos(u))*sin(v)+3*pi: -3*v+12*pi
- set parametric
- set pm3d explicit
- set pal rgb 9,9,3
- unset colorbox
- unset key
- unset border
- unset xtics
- unset ytics
- unset ztics
- set hidden3d
- set surface
- set ticslevel 0
- set size square
- set view 60,210,1.5,1
- set isosamples 18,48
- set xrange[-8:10]
- set yrange[-9:9]
- set urange[0:2*pi]
- set vrange[0:4*pi]
- set multiplot
- splot x(u,v),y(u,v),-z(u,v) w pm3d
- splot x(u,v),y(u,v),-z(u,v) lt 4
- unset multiplot
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