Mg and α-element ratios for Galactic stars, Pal 13 (star), and the GCs listed in Table 5, based on Massari et al. (2019). Left panel: the clusters are color-coded by their purported origin. Right panels: same data, but color-coded by (logarithmic) Galactocentric distance, maintaining the same symbols for the different progenitors. Contours in the [α/Fe] diagrams show the Gaia-Enceladus stellar component from Helmi et al. (2018) in terms of number densities from 0.5 to 3σ in steps of 0.5σ.