Chemical abundances from GSP-SPEC (top) and APOGEE (bottom panels). The top two panels can be compared as they show [M/H] vs. [α/Fe] and [Fe/H] vs. [Mg/Fe]. The [α/Fe] from the GSP-SPEC abundances (top) are dominated by [Ca/Fe], for which the separation between the different populations is known to be less clear than for other α elements, e.g., [Mg/Fe] (see e.g., Nissen & Schuster 2011), which is what is shown for the APOGEE abundances (middle panel). The bottom panel showing [Al/Fe] vs. [Mg/Mn] is often used to separate accreted from in situ stars. The legend shows groups or individual large clusters identified in our analysis. The median uncertainties are shown by the black error bar in the bottom-left corner of each panel.