Dependence of the mass of the largest remnants on the impact velocity v_imp and the impact angle θ_imp. Upper horizontal axis shows v_imp normalized by two-body escape velocity v_esc. The mass of the largest remnants M_lr normalized by the mass of an initial planetesimal M_target are color-coded. Thus, M_lr∕M_target = 2.0 means complete merging. The hatched region approximately shows the transitional parameters from merging collisions to hit-and-run or erosive collisions.