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Bull's eye
on 23 Oct 2021
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x=-.85:.005:.851;
y=x;
[X,Y]=meshgrid(x,y);
Z=sin(1./(X.^2+Y.^2+eps));
pcolor(X,Y,Z);
cmap = [jet; hsv; parula; hot];
colormap(cmap)
shading interp
axis('equal','square','off')