Evolution of maximum planetesimal mass (full line) and total mass in planetesimals (dash-dotted line) for 128³ simulations with inelastic NS collisions (thin yellow line shows the simulation without collisions for comparison). Colors indicate . Extended wiggles in the curve arise during clump merging. The total particle mass in the box is 2.8, 1.4 and 0.56 Ceres masses, in order of decreasing .