Probability (in %), as a function of the cluster size N, to realize the double condition: 1) the number of stars with mass higher than M_SN is less than n_SB; and 2) one star at least has a mass greater than M_min, where the values n_SB, M_min, and M_SN are set to vary. For each point, the IMF (see text) was simulated 10 000 times. Filled circles: n_SB = 5, M_min = 32 M_⊙, and M_SN = 8 M_⊙. Grey circles: all are the same, but M_SN = 10 M_⊙. Green circles: all the same, but n_SB = 4. Green squares: all the same, but n_SB = 6. Yellow circles: all the same, but M_min = 40 M_⊙. Yellow squares: all the same, but M_min = 25 M_⊙. This figure, essentially identical to Fig. 8 of Gounelle & Meynet (2012), is shown for clarity.