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Source code:

%it still needs some work, but I just post it... (wiki!)
x=-3:0.3:3
y=-3:0.3:3

for i=1:length(x)
 for j=1:length(y)
   ab(i,j)=abs(zeta(complex(x(i),y(j))));
 end
end

tomoplot = pcolor(ab);
colormap(hsv);
grid off;
saveas(tomoplot,'Zeta-abs.png');