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on 14 Oct 2021
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a=2.5;
b=1;
k=0.4;
[t,z] = meshgrid(linspace(0,2*pi,1000),linspace(-b,b,1000));
r = sqrt((1-b*z.^2)/a./(1+k*z));
surf(r.*cos(t),r.*sin(t),z,'edgecolor','none');
axis equal;
colormap(repmat(linspace(0.8,1,100)',1,3));
axis equal off;
material shiny;
camlight;
shading interp;
lighting gouraud;
view([48 28]);

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