The XSPEC bknpower model: broken power law.
xsbknpower The xsbknpower model is an additive model component.
The model is described at  .
>>> create_model_component("xsbknpower", "mdl") >>> print(mdl)
Create a component of the xsbknpower model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.PhoIndx1 thawed 1 -2 9 mdl.BreakE thawed 5 0.01 1e+06 keV mdl.PhoIndx2 thawed 2 -2 9 mdl.norm thawed 1 0 1e+24
The attributes for this object are:
The power law photon index for energies less than BreakE.
The break energy, in keV.
The power law photon index for energies greater than BreakE.
The normalization of the model. See  for details, as its meaning depends on whether the "POW_EMIN" or "POW_EMAX" keywords have been set with set_xsxset .
-  https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelBknpower.html
CIAO 4.12 comes with support for version 12.10.1n of the XSPEC models. This can be checked with the following:
% python -c 'from sherpa.astro import xspec; print(xspec.get_xsversion())' 12.10.1n
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.