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function I=define_ellipse(len,wid,eccentricity);
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maxdiam=odd(len,1);
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[x y]=meshgrid(-fix(maxdiam/2)-1:fix(maxdiam/2)+1,fix(-maxdiam/2)-1:fix(maxdiam/2)+1);
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radius=sqrt((x.*eccentricity).^2+y.^2);
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I=exp((-(radius-(len/2)).^2)./(0.5*wid.^2));
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