[S/Fe] versus [Fe/H] diagram before (bottom panels) and after (top panels) NLTE corrections applied to the A(S) obtained in this work for Rup 106 (left), Tr 5 (middle), and Tr2O (right) stars. In the middle panels, the results obtained by Caffau et al. (2014) for the star #3416 are reported in blue. Our results for the same star are highlighted in green. In the right panels, our results are compared with those of Duffau et al. (2017, red points).