Abundance ratios of the light elements Na and Al for the selected stars corrected for NLTE effects. The colour coding is the same as in Fig. 3. In the lower left corner of each panel, we report typical uncertainties for the abundance ratios. Literature abundances for MW stars are taken from Edvardsson et al. (1993); Fulbright (2000); Stephens & Boesgaard (2002); Gratton et al. (2003); Reddy et al. (2003, 2006); Barklem et al. (2005); Bensby et al. (2005, 2014); Roederer et al. (2014), Reggiani et al. (2017), and Paper I. Grey points with dark green borders are GSE stars from Paper I.