Trends of the LF slope, α, with global galaxy properties. From top left to bottom right: we show α as a function of the galaxy morphological T class, the Scal metallicity at the median galactocentric radius covered by our observations 12 + log(O/H)_⟨rgal⟩, the total stellar mass (M_*), the total SFR, the sSFR, the SFR surface density (Σ_SFR), the offset from the resolved star formation main sequence (Δ rSFMS), the offset from the resolved Kennicutt–Schmidt relation (Δ rKS), and the offset from the resolved molecular gas main sequence (Δ rMGMS). For each panel we report the Spearman correlation coefficient (ρ) and the p value of the plotted quantities. Middle-right panel: the solid red line shows the best fitting relation found by Cook et al. (2016), while the dashed gray and solid back horizontal lines respectively mark the α of the Cook et al. (2016) line at Σ_SFR = −2.6 and the mean α of the points at Σ_SFR >  −2.6 (see Sect. 6.1 for further details).