Comparison between the three-infall chemical evolution models presented in this study and APOGEE DR17 data in the [Mg/Fe] versus [Fe/H] abundance ratios. Symbols of the APOGEE DR17 stars are as in the upper panel of Fig. 14. Line types and colours of the two chemical evolution models are the ones indicated in Fig. 3 (model with strong dilution created by the third infall) and Fig. 5 (model with a less massive third infall).