Entropy profiles of X-ray-emitting gas of Perseus analogue self-regulated simulations with different SMBH masses (see legend). The coloured area indicates the 16th to 84th percentile of snapshots at times between t = 0.55 Gyr and t = 1 Gyr. The dotted line denotes 30 keV cm², an empirical dividing line between cool-core and non-cool-core clusters. The dashed line denotes the entropy profile of the Perseus cluster from Churazov et al. (2003), rescaled to h = 0.67. The central entropy establishes an equilibrium value that is dependent on SMBH mass.