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##

cutoffpl, zcutoffpl: power law, high energy exponential cutoff

A power law with high energy exponential rolloff.

where:

par1 |
, power law photon index |

par2 |
, e-folding energy of exponential rolloff (in keV) |

norm |
K in photons/keV/cm/s at 1 keV |

zpowerlaw is a variant which computes a redshifted spectrum
using the parameters:

par1 |
, power law photon index |

par2 |
, e-folding energy of exponential rolloff (in keV) |

par3 |
, redshift |

norm |
K in photons/keV/cm/s at 1 keV in the source frame |

If POW_EMIN and POW_EMAX have been defined by the xset command then
the norm becomes the flux in units of ergs/cm/s over the
energy range (POW_EMIN, POW_EMAX) keV unless POW_EMIN = POW_EMAX in
which case the norm becomes the flux density in micro-Jansky at
POW_EMIN keV. In these cases it is important that POW_EMIN and
POW_EMAX lie within the energy range on which the model is being
evaluated.

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**Up:** Additive Model Components
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