gauss, zgauss: gaussian line profile

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

where:

par1 | , line energy in keV |

par2 | , line width in keV |

Norm | , total photons/cm/s in the line |

For zgauss the corresponding formula is:

and parameter settings are:

par1 | , source frame line energy in keV |

par2 | , source frame line width in keV |

par3 | , redshift |

Norm | , source frame total photons/cm/s in the line |

The line is 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 .