The XSPEC pwab model: power-law distribution of neutral absorbers.
xspwab The xspwab model is a multiplicative model component.
The model is described at  .
>>> create_model_component("xspwab", "mdl") >>> print(mdl)
Create a component of the xspwab model and display its default parameters. The output is:
mdl Param Type Value Min Max Units ----- ---- ----- --- --- ----- mdl.nHmin thawed 1 1e-07 100000 10^22 atoms / cm^2 mdl.nHmax thawed 2 1e-07 100000 10^22 atoms / cm^2 mdl.beta frozen 1 -10 10
The attributes for this object are:
The minimum equivalent hydrogen column (in units of 10^22 atoms/cm^2).
The maximum equivalent hydrogen column (in units of 10^22 atoms/cm^2).
The power law index for the covering fraction.
-  https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSmodelPwab.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.