Fig. 4.
Change in intensity of the blackbody spectrum with kTrad = 2.35 × 10−7 keV (CMB) for thermal electron gas at kTe = 5 keV, 10 keV, and 25 keV as a function of dimensionless frequency X = hν/(kTrad), with scaling 
. The results obtained from the extended Kompaneets equation are shown as blue lines, while the red lines denote the results from the classical Kompaneets equation.
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