Bottom panel: distribution of galaxies in phase-space based on all spectroscopic members of MACS1206 used in this study. We plot radius versus velocity dispersion of star forming (blue) and quiescent (red) galaxies. Symbols with black edges show quiescent disk-dominated galaxies, that is, “red disks”. Their density distribution is highlighted with yellow shading, revealing their preferred location between R₂₀₀ and R₅₀₀. The dashed vertical line indicates R₂₀₀ ~ 1.96 Mpc of the cluster (as reported in Biviano et al. 2013), and R₅₀₀. Galaxies within the 2σ lines (inside the gray shaded area) are considered cluster members, while those between the 2 and 6σ lines are considered as infalling galaxies. Top panel: 2D distribution of all star forming and quiescent members estimated using Gaussian kernel density estimation (KDE). We show B/T as a function of cluster-centric radius, normalized by R₂₀₀. The plot demonstrates the distribution of galaxies across the cluster according to their morphology (expressed in B/T): at greatest distances to the cluster center, we find star forming galaxies with a spread of lower B/T. Their B/T values increase inside ₂₀₀. Finally, inside R₅₀₀, quiescent galaxies with higher B/T values prevail.