Simulation results for three different cloud masses corresponding to core radius R_c = [1, 10, 100] km at 39 au from the central star. Top left panel: average collisions per pebble . Top right panel: ratio of kinetic to potential energy E = K/|U|, bottom left panel: CMF in time. Bottom right panel: mass weighted initial and final pebble Stokes number distribution. The initial St distribution (red curve) is the same for all three cloud masses.