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            lorentz: lorentz line profile

A Lorentzian line profile.

A(E) = K*(E_L/(2*pi))/[(E-E_L)^2 + (sigma/2)^2]

where:

par1 = E_L

line energy in keV

par2 = sigma

FWHM line width in keV

norm= K

photons cm-2 s-1 in the line