h–k space evolution of parent belt particles (orange; a_belt = 100 au; β = 0.0; e ≈ 0.0), and particlescreated in collisions of parent belt objects; with fragment β values of β = 0.01;0.03;0.05 (black), and 0.3 (blue). The belt is around a star of M = 1.92 M_⊙, and the collisional fragments are perturbed by a m_p = 2.5 M_Jup mass planet, with a = 20 au and e = 0.6 (left); a = 60 au and e = 0.2 (right). The initial distribution of particles created in the collisions (dashed line), and the position after a time T (solid line) are shown. In between steps are marked with faint colours.