Same as in Fig. 1 but with a broken power law fit with LMM for the full (top) and soft (bottom) bands, as shown in Eq. (8). The break point of the power law is found at T_break = 2.7 keV and 1.7 keV, respectively. The low-T clusters are much better fit than the single power law fit, showing consistency between instruments. At high-T, the best-fit line deviates more from the 1:1 line than the single power law fit.