Density of galaxies normalised in each mass bin (same as Fig. 8 from Gallazzi et al. 2005) for the mass-age (left) and mass-metallicity (right) relations obtained with each SPS model in Table 1 (one model in each row). In each panel the black solid and dashed lines identify the median and 16^th and 84^th percentiles of the corresponding distribution in mass bins, while the yellow line identifies the median relations in the respective plane taken from Gallazzi et al. (2021). The last row displays the distributions for the fiducial models of this work. In these panels, the red line represents the original G05 scaling relations. Note: these results are obtained without aperture corrections, for consistency with G05 and G21. The dotted horizontal lines in the mass-metallicity planes indicate the solar metallicity of Z_⊙ ≡ 0.02.