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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 atoms cm) |

par2 |
maximum equivalent hydrogen column (in units of atoms cm) |

par3 |
power law index for covering fraction |