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pcfabs, zpcfabs: partial covering fraction absorption

A partial covering fraction absorption. The relative abundances are set by
the abund command.

where is the photo-electric cross-section (NOT including Thomson
scattering) (see phabs) and:

par1= |
equivalent hydrogen column (in units of atoms cm) |

par2=f |
dimensionless covering fraction |

The redshifted variant zpcfabs is given by:

where is the photo-electric cross-section (NOT including Thomson
scattering) (see phabs). Relative abundances are as for pcfabs.
Parameters are:

par1= |
equivalent hydrogen column (in units of atoms cm) |

par2=f |
dimensionless covering fraction |

par3=z |
redshift |