Number of collisions simulated and number of agglomerates at the end of the evolution at t = 98 years for each of the 3 × 56 populations discussed in Sect. 3. All populations started with N_A,init = 500 dimers. The colours indicate the three ensembles, which differ in terms of particle charges, q. The populations with q = 0.9q_ref finished with N = 2000 particles (duplicated once) and the populations with q = 1.0q_ref finished with N = 4000 particles (duplicated twice). Two distinct sets of populations with q = 1.1q_ref are visible, with (N_A < 325, N = 4000) and (N_A > 475, N = 8000), respectively. The populations with N = 8000 are duplicated three times.