A simple gaussian line profile. If the width is then itis treated as a delta
function. The **zgauss** variant computes a redshifted gaussian.

where:

par1 = |
line energy in keV |

par2 = s |
line width in keV |

Norm = |
total photons cm |

For **zgauss** the corresponding formula is:

and parameter settings are:

par1 |
line energy in keV |

par2 |
line width in keV |

par3 |
redshift |

norm |
total photons cm |