Fitting of atmospheric disk model to the Epoch 3 data in the range 2–9 keV. The observed data, black crosses, are the sum of three front-illuminated (XIS0,2,3) and one back-illuminated (XIS1) CCDs. The total model wabs * (atm+pl + gaussian) is represented by a red line. Separate model components are represented by: a long-dashed blue line – atm, short-dashed green line – pl, and dotted black line – instrumental gaussian. Reduced χ²/d.o.f. = 2618.57/2182 = 1.2 for the total model.