Suppression factor f vs. kT for the thermal support case. f = 1 means complete suppression, i.e., no SZ signal from the bubbles, while f = 0 means no suppression, i.e., the signal within the bubble is identical to the global ICM signal. The blue band shows the best fit f with 1σ uncertainties for the lowest f case considered in Sect. 4, corresponding to thermal pressure support by electrons with temperatures of at least 100 keV. The dashed line shows the lowest value consistent with Abdulla et al. (2019) to 1σ.