log(S/O) as a function of 12+log(O/H) (top) and as a function of 12+log(S/H) (bottom). Black squares and blue circles represent SFGs and H II regions of the DESIRED-E sample, which S/O ratios have been calculated using the ICF(S) scheme by Izotov et al. (2006). The green continuous line shows the time evolution of S and O abundances of the ISM predicted by the CEM of the Milky Way of Kobayashi et al. (2020). Yellow stars represent the abundances obtained from quantitative spectroscopic analysis of Galactic B stars by Weßmayer et al. (2022). Orange stars represent the abundances of Galactic classical Cepheids determined by da Silva et al. (2023). Orange diamonds indicate the mean log(S/O) values considering bins in 12+log(S/H). The red continuous lines represent linear fits to the data represented in each panel. The black dashed lines and the grey bands show the solar 12+log(O/H), 12+log(S/H) and log(S/O) and their associated uncertainties, respectively, from Asplund et al. (2021).