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on 18 Oct 2021
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[z,t] = meshgrid(linspace(-1,1,30));
t = t*pi;
x = (z.^4+0.1).*cos(t);
y = (z.^4+0.1).*sin(t);
mesh(x,y,z,1-z.^2,'facealpha',0); hold on;
plot3([0 0],[0 0],[-1 1]*1.5,'-w');
axis equal off;
view(5,10);
set(gcf,'color','k');
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