Galaxy redshift distribution. Dashed vertical lines delimit the redshift range including 77 galaxy members assigned to RXCJ1230 according to 2.7σ_v clipping. The velocity distribution in the cluster rest frame of the 77 cluster members selected is superimposed. The black curve represents the reconstruction of the velocity distribution as a Gaussian profile, considering the σ_v computed using the biweight estimator and assuming all the galaxies belong to a single system. The velocity corresponding to the BCG is also marked.