a) Schematic of a collision between unequal particles with a mass ratio R(m) = (mproj/mtarget) ≪ 1. b) Sticking occurs when vrel<veros. The mass of the projectile is added to the target. c) Collisions above the erosion threshold velocity lead to erosion. The mass loss of the target is given by the erosion efficiency ϵeros and the mass of the projectile.
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