Mg- versus Al-plane using BACCHUS abundances from Mészáros et al. (2020). The abundances were systematically shifted as indicated in Appendix A of Belokurov & Kravtsov (2024). Semitransparent circles represent single stars, while diamonds represent mean abundances for each cluster. Coloured dashed lines are the contours of the distribution of the single stars. The distribution of Mg and Al are shown in histograms at the right and top of the plot, respectively. Single star distributions show two clear dense areas where the in and ex situ stars are concentrated. This is more difficult to reproduce with mean values.