A three-segment broken power law (i.e. with two break energies).
|par1 =||power law photon index for|
|par2 =||first break point for the energy in keV|
|par3 =||power law photon index for|
|par4 =||second break point for the energy in keV|
|par5 =||power law photon index for|
|norm = K||photons/keV/cm/s at 1 keV|
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.