Main asteroid belt plotted in semimajor axis a vs. inclination I. The six defined regions are Inner, Middle, Pristine, Outer, Cybele, and High-Inclination, which are separated by the positions of the major resonances in the asteroid belt. The resonances considered are ν₆, 3:1, 5:2, 7:3 and 2:1. The curve denoting the bond of the ν₆ resonance was plotted according to Morbidelli & Vokrouhlický (2003). Data were obtained from the Minor Planet Center.