A Comptonization spectrum after Lamb and Sanford, 1979, M.N.R.A.S, 288, 555. This model calculates the self-Comptonization of a bremsstrahlung emission from an optically-thick spherical plasma cloud with a given optical depth and temperature. It was popular for Sco X-1.
par1 = temperature in keVpar2 = optical depth
K = ?