Mean stellar metallicity and log⟨Z_⋆⟩ as a function of total stellar mass M_⋆for the Main Sample. Blue and red lines and points represent FADO and STARLIGHT results, respectively. The ‘✚’, ‘★’ and ‘✖’ symbols represent the average values for the ISFS, SFS and PS populations, respectively, with standard deviation errorbars. Linear regression results for the MS population from each code are present in the legend of each plot.