Left panel: cumulative distributions of approach velocities to different planets for collisional orbits in the reference model. The curve for Mercury shows some wiggles owing to relatively sparse material. The thin vertical lines indicate the circular speeds at the mean distance of each planet. Right panel: cumulative distributions of approach velocities to the Earth for collisional orbits in the reference, erosional and Di Sisto models. For the latter two, the slope index s₁ = 2.5 has been used. The wiggles in the curve for the Di Sisto model are due to the sparse material.