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lorentz: lorentz line profile

A Lorentzian line profile.


\begin{displaymath}
A(E) = K (E_L/(2\pi))/[(E-E_L)^2 + (\sigma/2)^2]
\end{displaymath}

where:

par1 $E_L$, line energy in keV
par2 $\sigma$, FWHM line width in keV
norm $K$, photons/cm$^2$/s in the line