Value of of the fit of the data provided in Table 1, with the best model from Table 3, for various Salpeter-like IMFs, as a function of the upper mass cut-off (in M_⊙) and slope of the power-law (α). The contours delimitate the 68% and 95% confidence levels for the given degrees of freedom (in orange and yellow, respectively). The best-fit value is indicated by the green dot (α = −1.97, M_cut = 47 M_⊙, ).