Upper panel: [Mg/Fe] versus [Fe/H] abundance ratios for APOGEE DR17 stars with Galactocentric distances between 7 and 9 kpc are reported with the black points. APOGEE DR17 stars that cross-match with the population of massive stars presented by Gaia Collaboration (2023b) characterised by chemical impoverishment with maximum vertical heights |z_max|< 0.5 kpc are indicated with the yellow points. Lower panel: same as the upper panel but for [α/Fe] versus [Fe/H].