Fraction of the final mass gained through collisions (f_col), accretion (f_acc), and the initial mass (f_ini) for the MMO and second MMO, for models with different ε_SF. We present one simulation in each panel. In general, the initial mass is always in the range 80-150 M_⊙, and the mass gained by accretion is always in the range 100-200 M_⊙; the difference comes from the total mass gained through collisions.