Diffusion coefficients (top left), particle eccentricity (top right), relative velocities v_rel (bottom left), and |$v^{\prime }_{\rm rel}$| (bottom right) versus the effective stopping time for fixed size simulation tc = 10.size. The effective stopping times are calculated by time and particle averaging of t_stop of individual particle. Results of tc = 10 from Fig. 4, which are shown with smaller grey squares, almost match fixed size results and therefore validate the usage of fixed stopping time particles in this work. We note that the constant t_stop approach could overestimate the relative speed for intermediate size particles with a* = 1 or effective τ_s ∼ 1.