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zxipcf: partial covering absorption by partially ionized material

This model uses a grid of XSTAR photionized absorption models (calculated
assuming a microturbulent velocity of 200km/s) for the absorption, then
assumes that this only covers some fraction f of the source, while the
remaining (1-f) of the spectrum is seen directly. This is the model used
by Reeves et al. (2008)
'On why the iron K-shell absorption in AGN is not
the signature of the local warm-hot intergalactic medium', and may also be
more generally applicable to the spectral complexity seen in Narrow Line
Seyfert 1 AGN (Miller et al. 2007).

par1 |
column density ( cm) |

par2 |
log(xi) where xi= |

par3 |
covering fraction |

par4 |
redshift |