Fig. 1.
Observed stellar [Mg/Fe] versus [Fe/H] abundance ratios from APOGEE DR16 (Ahumada et al. 2020) for three bins of different Galactocentric distances. The regions are 4 kpc-wide centred at 4 kpc (left panel), 8 kpc (middle panel) and 12 kpc (right panel), respectively. The contour lines enclose fractions of 0.90, 0.75, 0.60, 0.45, 0.30, 0.20, 0.05 of the total number of observed stars. Details on the data selection are reported in the text.
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