Plot of 125 velocity dispersion profiles, each one obtained with a different binning of the data from the S09 sample alone (upper panel), or the combined S09+SMG sample (lower panel). The envelope of all these profiles, rather than the singular points, shows the flattening of the profile beyond r ~ 20 arcmin. The velocity dispersion reported by S09 (red points with error bars) closely follows the center of the envelope. However, the value of σ = 5.2 km s^-1 at r = 25.7 arcmin is not representative of the data, being in both cases at the very bottom of the envelope. The vertical line gives the MOND radius, while the horizontal one is only meant to highlight the flattening of the dispersion profile.