Rotation velocity over velocity dispersion trends when galaxies are removed by successive radial cuts in the three clusters with a large number of identified members with measured line-of-sight velocities: Abell S1063, MACS J1206, and Abell 370 (in the legend, we use N_t = N_tot and v_r = v_rot). As in Fig. 2, we display only the AS1063 one-sigma error band to illustrate resampling uncertainty without overcrowding the figure. While for the first two the low-number bias model reproduces the observed trend reasonably well, A370 deviates significantly in the central region – convincing evidence of systematic rotation in its core. The vertical lines indicate the number of galaxies within a 0.5 Mpc radius.