The total bound mass and the mass in the most massive gravitationally bound clump as a function of time. The left panel shows the result of the moderate-resolution simulation (M2). Around a time of 30   T_orb there is a condensation event that transfers many particles to bound clumps. Two orbits later, at 32   T_orb, the two most massive clumps collide and merge. The right panel shows the high-resolution simulation (H). The total amount of condensed material is comparable to M2, but the mass of the most massive clump is smaller. This may be a result either of increased resolution in the self-gravity solver or of the limited time span of the high-resolution simulation. The total particle mass for both resolutions is M_tot ≈ 460   M_Ceres. Only around 10% of the mass is converted into planetesimals during the time-span of the simulations.