Density distribution of MB objects in the proper (a_p, I_p) element space limited to I_p ≤ 20°. Only objects with absolute magnitudes below 15.5 were considered. The eccentricity interval shown on the top of each graph. The density or number (in per cent) of the asteroids inside a cell is shown with different colors (see the legend box); blue corresponds to minimal values (between 2 and 5) and red to maximal values (>20). The size of the cell is . The location of main MMRs is indicated with vertical lines and the location of the linear ν₆ SR is indicated with thick curves.