Notes. Parameters of the (Eq. (8)) and (Eq. (9)) scaling relations obtained from the measured stellar velocity dispersions of cluster member galaxies. For each value, we quote the median value and the 16th, 84th percentiles of the marginalized posterior distribution of the parameter (see Fig. 6). The normalization is computed at the reference magnitude of the brightest cluster member galaxy in our catalog. The slope β_cut of the relation is inferred from Eq. (11) (see text).