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Fig. 8

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Threshold velocities for collisions between equally sized planetesimals as a function of their spherical radius R1. The disruption curves for the weak (dashed-dotted line) and strong rock (dashed line) are shown for two different impact velocities VI = 50 m/s (green) and VI = 2 km s-1 (blue) along with the solution for rubble piles (black-solid line). The bodies escape velocity (black-dotted line) is also shown.

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