Four parts of the main asteroid belt defined according to the proper semimajor axis a (we used proper values of a and I from Asteroids Dynamic Site; Knežević & Milani 2003). The number of objects plotted here is 100 000. The horizontal line separates the region sin I< 0.04, for which the maximum of distributions of λ for λ ~ 80° is highest. The locations of some more populous asteroid families are emphasized.
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