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on 27 Oct 2021
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% https://upload.wikimedia.org/wikipedia/commons/e/e7/Hydrogen_Density_Plots.png
r=meshgrid(0:.1:25);
t=r'*2*pi/25;
P=exp(-r/2).*r.*cos(t);
x=r.*cos(t);
y=r.*sin(t);
contourf(y,x,abs(P),1e3,'edgec','n');
caxis([0 1]);
colormap hot;
axis equal off;
set(gcf,'color','k');
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