Correlations of [Fe/H] and [α/Fe] with velocity dispersion, stellar mass and mean light-weighted age for our sample galaxies (same as Fig. 12). Colors reproduce the classification from Fig. 17 into SLF-ETGs (yellow) and ACC-ETGs (pink). The mean for each subpopulation is also shown as a large square with black borders. Galaxies that could not be reliably classified are shown as black dots.