Convergence test for the fiducial model for different number of representative pebbles N. Top left panel: average collisions per pebble in time. Top right panel: ratio of the kinetic to potential energy K∕|U| of the cloud in time. The results are the same for increasing N already at N = 10⁴. Bottom left panel: CMF (settled pebbles) in time. Results are the same for all N. Bottom right panel: mass distribution function vs. the radius (Stokes number) of the pebbles of the final core.