Main asteroid belt, plotted in semimajor axis a versus inclination I. The six defined regions are Inner, Middle, Pristine, Outer, Cybele, which are separated by the positions of the major resonances in the asteroid belt, and the High-Inclination region where sin i > 0.34. 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 Minor Planet Center.