M_star distributions of blue sub-classes C7–10 normalised to the maximum value of the histograms. The mean and standard deviation are shown in the upper left. The KS probability is displayed in the upper right. The blue filled histogram indicates the M_star distribution for the mass-matched sample and corresponds to the area below the distributions for all sub-classes. The mass-matched sample returns the same M_star distribution for all four C7–10 sub-classes.