Velocity distribution of cluster members (after excluding galaxies flagged by the DSb substructure analysis). Top panel: members within = 1.24 Mpc. The blue and red histograms identify the KMM partitions (namely, members with probability ≥0.5 and, respectively, <0.5 to belong to the low-velocity group, KMM-sub). The dotted (blue and red) curves are the two Gaussians with mean and velocity dispersions obtained from the subsamples of the same colors. The dash-dotted magenta curve is the sum of the two Gaussians. The black dashed curve is the Gaussian with mean and velocity dispersion obtained from the full sample. Bottom panel: members outside =1.24 Mpc (histogram). The black dashed curve is the Gaussian with mean and velocity dispersion obtained from the full sample.