Disc components selected based on the chemistry of the APOGEE stars in the Galactic region enclosed between 6 and 10 kpc presented in Sect. 2. Red points show high-α sequence stars, and light blue points show the low-α ones. The contour lines enclose fractions of 0.95, 0.90, 0.75, 0.60, 0.45, 0.30, 0.20, and 0.05 of the total number of observed stars for the two sequences, separately.