Abundance ratios between specific light elements. Bottom panels: [Na/Fe] versus [O/Fe] (left panel) and [O/Na] (right panel) abundance ratio distributions for the Terzan 6 stars observed with X-shooter (filled triangles). Typical measurement errors are also plotted in the corner of each panel. For comparison, the corresponding measurements of giant stars (dots) in 47 Tuc, a GC with similar metallicity, from the compilation of Carretta et al. (2009) are also reported. Stars below and above the gray shaded area are likely first and second generations, respectively, while those within it are borderline (see also Carretta et al. 2009). Top panels: [Al/Fe] versus [Mg/Fe] (left panel) and [O/Fe] (right panel) abundance ratio distributions for the Terzan 6 stars observed with X-shooter (filled triangles) and NIRSpec (open squares). Typical measurement errors are also plotted in the corner of each panel. For comparison, the corresponding measurements of giant stars (dots) in other bulge GCs (see Origlia et al. 2008; Valenti et al. 2011, and references therein) and in 47 Tuc from the compilation of Carretta et al. (2009) are also reported.