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Name it .. :-)
on 20 Oct 2021
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u = linspace(0,2*pi,200);
v = linspace(-2,2,200);
x = (1+v/2.* sin(u)).*cos(u)';
y = (1+v/2.* cos(u)).*sin(u)';
z = (v/2).*sin(u/2)';
plot3(x(:),y(:),z(:),'k')
view(90,-73)
axis off