Comparison of the satellite velocity dispersion obtained using three different halo masses in the estimates of r_vir and v_vir. The left column shows the results for star-forming samples and the right column for the total samples. Different rows represent different stellar mass bins. In each panel, the three data points are for halo masses that correspond to 16, 50, and 84 percentage points of the mass distribution, respectively, as labeled on the horizontal axis.