Particle growth for different radial extents of the simulation box and turbulence strengths. The mean particle size ⟨ R ⟩ is shown as a function of time in inverse Keplerian orbits Ω^-1 for α = 10^-2 (left panel), α = 10^-3 (middle panel) and α = 10^-4 (right panel). The size of the box has been extended in the radial direction, with r_max colour coded as: black 0.75 H, blue 2.25 H, red 3.75 H and yellow 5.25 H. For all runs z_min =  −6.0 H, z_max = 6.0 H and r_min =  −0.75 H. The inlay figure shows the simulation domain, with the considered radial extents marked.