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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 |
, line energy in keV |

par2 |
, gaussian line width in keV |

par3 |
, lorentzian FWHM line width in keV |

Norm |
, total photons/cm/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
.