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laor: accretion disk, black hole emission line

An emission line from an accreti on disk around a black hole. Ari Laor's calculation including GR effects (Laor (1991)).

par1 Line energy in keV
par2 $a$, power law dependence of emissivity (scales as $R^{-a}$)
par3 inner radius (units of $GM/c^2$)
par4 outer radius (units of $GM/c^2$)
par5 inclination (degrees)
norm photons/cm$^2$/s in the line