Mass distribution of the CHEX–MATE and THE THREE HUNDRED samples. These are shown with black empty and green polygons, respectively. The gap between is an artefact from the CHEX–MATE sample being divided into two tiers, shown in Fig. 1. The shift between the two distributions is due to the fact that the CHEX–MATE masses are assumed to be 0.8 lower than the true mass due to the hydrostatic bias. For more details, refer to Sect. 4.