Average velocity and 1D velocity distributions of individual ion species for different groups. We calculated V_Fe within the Fe signals ([ST_Fe, ET_Fe]), and V_O was calculated within O signals ([ST_O, ET_O]). (a) Bulk speeds of Fe and O ions. (b) Differential speeds between the bulk of Fe and O ions and the local protons. (c) Two-dimensional distribution of the differential speeds between the bulk of Fe and O ions and the local protons. The averages of distributions in panel b are marked here. The bin width is 1 km/s in both directions. (d)/(f) Kernel density estimation functions of |δV|/V_A for individual ion species in all Fe-up or Fe-down cases based on S_strong. The peaks of distributions are marked by crosses. Pentagons above the x-axis mark the average δV of the individual charge states. The uncertainties of probability density were obtained based on a bootstrap method (Efron 1979) and are represented by shaded areas. (e)/(g) Differential speeds of different ion species.