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pwab: power-law distribution of neutral absorbers

An extension of partial covering fraction absorption into a power-law distribution of covering fraction as a function of column density, built from the wabs code. See Done & Magdziarz 1998 (MNRAS 298, 737) for details.

par1 minimum equivalent hydrogen column (in units of $10^{22}$ atoms cm$^{-2}$)
par2 maximum equivalent hydrogen column (in units of $10^{22}$ atoms cm$^{-2}$)
par3 power law index for covering fraction