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