Illustration of the implied color distribution P(C) implied by the Si II velocity distribution PV(v) and an assumed step function for the mean intrinsic color vs. velocity. Bottom left: the Si II velocity distribution is a gamma distribution with a long tail toward high velocities. Top left: the high-velocity group has a mean intrinsic color of −0.04 mag, and the normal velocity group has a mean intrinsic color of −0.10 mag. The residual intrinsic scatter in both cases is σC = 0.02 mag (dashed lines). Top right: the marginal intrinsic color distribution has a double peaked structure, with a small hump at redder colors associated with the high-velocity subgroup.