Comparisons between model and observed distributions for the sample of 60 SB from CP07. The upper panel shows the distribution of the mass function, f(m), as well as the two best fits obtained by CP07: the solid line connecting the heavy dots with error bars corresponds to a power law, with index α = −0.3, while the dotted line connecting circles is a Gaussian, centred around 0.8 M_⊙ and with σ_M = 0.5   M_⊙. The corresponding distributions of log f(m) are shown in the lower panel.