Fit of the temperature profile with a power law for R > 0.3 R₅₀₀. Orange (blue) points represent regions where SOU/BKG is greater (smaller) than 0.2. The blue line and dark envelope represent the best fit function and its errors on the full dataset, while the light shaded area marks the intrinsic scatter. The red line and envelope show the best-fit for regions with SOU/BKG > 0.2 (intrinsic scatter not shown for clarity).