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voigt: Voigt line profile

A simple Voigt line profile. The Voigt profile is the convolution of a Gaussian and a Lorentzian.

The parameters are:

par1 $E_l$, line energy in keV
par2 $\sigma$, gaussian line width in keV
par3 $\gamma$, lorentzian FWHM line width in keV
Norm $K$, total photons/cm$^{-2}$/s in the line

Both the gaussian and lorentzian lines are truncated at the point that the integrated flux under the line is within a critical value of the total flux. This critical value can be changed using xset LINECRITLEVEL. The default critical value is $1.0\times10^{-6}$.