Line-of-sight velocity dispersion profiles of different cluster galaxy populations in the four stack samples (top-left: Reg-sigv; top-right: Reg-Num; bottom-left: Irr-sigv; bottom-right: Irr-Num). Red dots, green squares, and blue stars represent the VDPs of E, S0, and S galaxies, respectively. The red solid, green dash-dotted, and blue dashed lines represent model fits described by Eq. (2) and Table 3. The black dotted line represents the theoretical VDP predicted for a cluster with a NFW mass distribution of concentration c ≡ r₂₀₀/r_s = 3 and with a velocity anisotropy profile for its galaxies given by Eq. (60) in Mamon & Łokas (2005) with r_a = r_s. Error bars are computed according to Eq. (16) of Beers et al. (1990).