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on 15 Oct 2021
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c=flip(copper);
c(:,2)=c(:,2)*1.25;
c(:,3)=c(:,3)*1.55;
X=linspace(-164,164,300);
[t,r]=cart2pol(X+50,X');
[y,s]=cart2pol(X-50,X');
colormap(c);
a=2.2*sin(t*20)+80*r.^.32+2.2*sin(y*20)+80*s.^.32;
image(rescale(a,0,320))
set(gcf,'Color','k')
axis off
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