An emission line from an accretion disk around a black hole. Ari Laor's calculation including GR effects (ApJ 376, 90).
par1 = Line energy in keVpar2 = power law depend. of emissivity
par3 = inner radius (units of
)
par4 = outer radius (units of
)
par5 = inclination (degrees)
K = photons/cm
/s in the line