Velocity dispersion versus stellar mass for the total (left), radial (middle), and tangential (right) components. Circles and triangles correspond to the inner ($\overline{R}=1R_h$) and outer ($\overline{R}=2R_h$) regions, respectively. Filled symbols show the masses derived from the baseline isochrone, while open symbols show the masses obtained from the alternative model that includes the metallicity distribution from Marino et al. (2011) and a higher mean helium abundance (Y = 0.30).