Physical parameters of selected clusters. Top panel: Morphological parameters’ plot. The dashed blue line indicates the w value used to select clusters in our sample. Dashed grey lines indicate the c and w values that separate clusters with a RH (c ≤ 0.2 and w ≥ 0.012) from clusters without a RH, according to Cassano et al. (2010). Bottom panel: Redshift-mass distribution of clusters coloured according to their central entropy (K₀).