Convolves the current spectrum with the line shape from the kerrdisk model. A detailed description can be found in Brenneman & Reynolds (2006ApJ...652.1028B). This model is quite slow so is best used after models such as laor or diskline have been employed to get an estimate of the best-fit parameters.
par1 = emissivity index for the inner disk
par2 = emissivity index for the outer disk
par3 = break radius separating the inner and outer portions of the disk (gravitational radii)
par4 = dimensionless black hole spin
par5 = disk inclination angle to the line of sight (degrees)
par6 = inner radius of the disk in units of the radius of marginal stability
par7 = outer radius of the disk in units of the radius of marginal stability