Chemical separation between thin- and thick-disk stars. Top panel: density map of the [Mg/Fe] vs. [Fe/H] distribution of our CNN results for the low S/N inner + outer observed sets. Brighter colors indicate a higher density of data points (linear color scale). Bottom panels: same plot as in the top panel, but for the stars in the test and inner observed set with S/N ≥ 30. Thin and thick disk populations found by the HDBSCAN algorithm are shown at the bottom. The two populations correspond to the two dense regions in the panel above.