Constraints on the exponents a_M and a_z in based upon the gas density and temperature profiles in S18 (top panel; likelihood contour at 1 and 5σ equivalent to Δχ² of 6.2 and 28.8 for 2 degrees of freedom, respectively) and G19a (bottom panel; on a_M only, because all the 12 objects have a redshift < 0.1. For the sake of comparison, 5σ corresponds to Δχ² of 25.0 for 1 degree of freedom). The dotted red lines are the predicted self-similar slopes, and the dashed blue lines correspond to the expected slopes from the i(cm)z model.