Constraints to the residual mass dependence A_m in the entropy rescaling. Left panel: distribution of the intrinsic scatter of different samples as a function of A_m, to identify the global (i.e. within [0.3 − 0.8] R₅₀₀) A_m correction (Sect. 5.3.1). Yellow is used for the combined X-COP – HIGHMz sample, brown for REXCESS – ESZ – HIGHMz, while blue for HIGHMz only. Vertical dashed lines and shaded areas mark the positions of the minima, together with their statistical errors. Right panel: radial dependence of the A_m values which minimise the scatter of the combined REXCESS – ESZ – HIGHMz sample (Sect. 5.3.2), together with their statistical errors (black solid line and grey shaded area). Shown in brown (blue) is the global measurements using REXCESS – ESZ – HIGHMz (HIGHMz only) sample. In red are results from REXCESS only (Pratt et al. 2010). Both in the left and right panels, black dashed lines are the prediction from self-similar scenario, i.e. A_m = 0.