Distribution of tracer particles accreted during 1.5 × 10⁷ s for the low energy (e1) and high energy accretion (e9) cases respectively. Colour scale is the radial velocity in units of cm s^-1 and grey scale points show the position of the tracer particles. Velocities are instantaneous, i.e. not time-averaged. Blue indicates down flows, while red indicates up flows. Lighter coloured points correspond to more recently added tracer particles. Both snapshots are at a time t = 1.5 × 10⁷ s.