2lorenz

This is the sum of two lorenzians and it has the form:

f (x) = $\displaystyle {\frac{{a_2 a_1}}{{4(x-a_0)^2 + a_1}}}$ + $\displaystyle {\frac{{a_5 a_4}}{{4(x-a_3)^2 + a_4}}}$.

It sometimes takes some effort to get a fit to this function to converge.