Slope distributions (from s1 at left to s4 at right) for all the asteroids in our sample (upper panel) and for those classified by Tholen (1984) (lower panel). Vertical lines indicate the computed median for each taxonomical class. The title of each column indicates the total number of asteroids with such slope computed. B- and T-types have five or fewer members with computed s1, thus, we decided not to show them in the corresponding plots.