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swind1: absorption by partially ionized material with large velocity shear

A model to fit the soft excess in AGN by partially ionized absorbing material
with large velocity shear. It approximates this by using XSTAR kn5
photoionization absorption model grids (calculated assuming a microturbulent
velocity of 100km/s), and then convolving this with Gaussian smearing.
This is the model used by Gierlinski & Done 2006, Sobolewska & Done 2006
and Done et al 2006. It is an update (uses a newer version of XSTAR) of the
original model of Gierlinski & Done 2004.

par1 |
column density ( cm) |

par2 |
log(xi) where xi = |

par3 |
sigma : Gaussian sigma for velocity smearing (v/c) |

par4 |
redshift |