The spectrum from an accretion disk consisting of multiple blackbody components. For example, see Mitsuda et al., PASJ, 36, 741, (1984), Makishima et al., ApJ 308, 635, (1986).
|par1||temperature at inner disk radius (keV)|
|norm||, where where is ``an apparent'' inner disk radius in km, the distance to the source in units of 10 kpc, and the angle of the disk ( is face-on). On the correction factor between the apparent inner disk radius and the realistic radius, see e.g., Kubota et al. 1998, PASJ, 50, 667.|