Radial velocity as a function of the distance from the cluster centre (upper panel). Coloured symbols are the same as in Fig. 1; filled triangles are stars from F93. The solid lines represents the ±3σ envelope of the King (1966) model that best fits the surface brightness profile, according to H96. The profile is normalized to the central velocity dispersion σ₀ = 7.5 km s^-1. Velocity dispersion profile (lower panel) as derived from the global sample (this work + F93, excluding stars lacking abundance estimates). The solid line is the profile of the same King (1966) model as above; the dotted line is the same model normalized at the central velocity dispersion reported in H96, σ₀ = 6.4 km s^-1.