Frequency distribution of MB objects (normalized to total amount) in the proper semimajor axes (top), proper eccentricities (middle), and proper inclinations (bottom). Gray patterns: general background population of the MB (for details, see text). Red patterns: large objects (D> 30 km). Solid vertical lines show the current location of the strong Jovian MMRs. Their location until the sweeping by migrating Jupiter is shown by dashed vertical lines.