Fig. 7

Orbital evolution of asteroid clones 2 × 105 yr backwards (top) and forwards (bottom) from the present. The left panels show the semimajor axis while the right panels show the eccentricity. Only one in every twenty clones is plotted to maintain clarity. The grey dashed line denotes the minimum eccentricity required for an orbit with a semimajor axis of 1.33 AU to cross that of the Earth.
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