The KS-probability that the cumulative -distribution (solid lines) and -distribution (dashed lines) obtained from the SDSS groups is consistent with that obtained from our mocks, as a function of b_vel. Results are shown for four log halo mass intervals, indicated in square brackets in each panel. The horizontal dotted line in each panel indicates P_KS = 0.01: based on estimates of the scatter due to cosmic variance, we consider two distributions to be statistically equivalent when P_KS > 0.01.