Left: initial orbits of fragments with β values of 0.0 (orange), 0.1 (black), and 0.3 (blue), emitted in a single collision from a circular orbit at a = 100 au (and ϖ = 30°; particles moving anti-clockwise). Particles with β ≥ 0.5 (red) are on unbound orbits. Right: initial positions (circle) of the same fragments in the h–k space and their circles of movement (dashed line) around the forced eccentricity (dot of according colour). The arcs they covered in the h–k space within 5 Myr are shown as solid lines. Given the planet at a_p = 20 au with e_p = 0.6 (and ϖ_p = 0°), they have precession times of (for β = 0.0), (for β = 0.1), and (for β = 0.3).