compst

A Comptonization spectrum after Sunyaev and Titarchuk 1980, A&A, 86, 121. This model is the Comptonization of cool photons on hot electrons.

par1	 = 	temperature in keV

par2	 = 	optical depth

K 	 = 	 , where N is the total number of photons

      		from the source, d is the distance to the source, and f

      		is the factor   , where z is the

      		spectral index, y is the injected photon energy in units

      		of the temperature, and    is the incomplete gamma function.