Hybridisation coefficients of W4 with either FUV (panels a, b, and c) or Hα (panels d and e) as a function of sSFR (left), L_Hα/L_W1 (middle), and L_FUV/L_W1 (right) for the MaNGA sample (using galaxy-integrated fluxes). Best-fit relations obtained for the PHANGS 15″ data (Fig. 5) are shown in blue. Blue diamonds show the results obtained considering the integrated fluxes from the 19 PHANGS galaxies. Values of and from the literature are shown as dashed horizontal black lines and are labelled in the figure (see text for additional detail). The scatter σ of the data with respect to the best fit is presented in the bottom right corner. The MaNGA data show similar trends as the resolved regions in PHANGS galaxies, even though in general it displays flatter slopes and does not reach the same values of C at the highest sSFR.