Top: the resolved SFE_mol vs. galactocentric radius for SF pixels within R _b, color-coded by their ΔSFMS. Black plus signs are pixels drawn for PHANGS–ALMA spirals. Solid blue and green lines correspond to 90%, 60%, and 30% density contours of main-sequence and green valley pixels, respectively. Dashed lines are density contours for pixels when adopting a variable ﹩{\alpha }_{\mathrm{CO}}(Z^{\prime} ,{{\rm{\Sigma }}}_{\mathrm{total}})﹩ prescription (see Equation (6)). Middle: the resolved SFE_mol vs. the resolved sSFR for the same groups as in the top panel. Bottom: distribution of the resolved molecular-to-stellar mass fraction, ﹩{{rR}}_{\star }^{\mathrm{mol}}﹩, for main-sequence and green valley galaxies included in the top panel. The vertical and horizontal lines are the mean and standard deviation values of the distributions, respectively. We note that the spatially resolved SFE_mol, sSFR, and ﹩{{rR}}_{\star }^{\mathrm{mol}}﹩ within the bulges have a systematic decrease with ΔSFMS, and these trends seem to not depend on the adopted α _CO prescription.