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lorentzian fit

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from lorentzian fit by Yohanan Sivan
In the attached file example i use "nlinfit", which can fit any kind of function that you want. the

[y]=fun(v,x) 
function [y]=fun(v,x)
y0=v(1);
A=v(2);
w=v(3);
x0=v(4);
y=y0+(2*A/pi).*(w./(4*(x-x0).^2+w.^2));

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