Mean abundances for NGC 6535 (from Table 8) compared to field stars and other GCs of our FLAMES survey of similar metallicity. We used here data from Gratton et al. (2003), indicated by grey open squares, and Venn et al. (2004), indicated by light grey open triangles. For the GCs, indicated by light blue open squares, abundances are taken from Carretta et al. (2014b) for NGC 4833, Carretta et al. (2015) for NGC 6093, Carretta et al. (2017) for NGC 5634, and from Carretta et al. (2009b, Tables 5 and 10, including only Fe, O, Na, Mg, and Si) otherwise. The error bars indicate the rms in each elemental ratio.