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            disk: accretion disk, black body

The spectrum from an accretion disk, where the opacities are dominated by free-free absorption, i.e., the so-called blackbody disk model. Not correct for a disk around a neutron star. 

par1

accretion rate in Eddington Luminosities

par2

central mass in solar mass units

par3

inner disk radius in gravitational (= 3  Schwarzschild radii)

par4

distance in kpc

norm

2cos(i)/d^2 where i is the inclination of the disk and d is the distance in units of 10 kpc