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on 14 Oct 2021
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figure('color','k');
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');
colormap(repmat([0.96 0.74 0.58],256,1));
axis equal off;
material dull;
camlight;
shading interp;
lighting gouraud;
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