Mass-metallicity relation: Oxygen abundance (12 + log(O/H)) vs. stellar mass (log M) color-coded by the SFR. 12 + log(O/H) is estimated using direct T_e calibrations (Sanders et al. 2024b) for a subset of 13 sources (∼8%) with bright emission lines (see Sect. 4.4 for details). Our galaxies are represented as inverted stars. The mass-metallicity relations found for nearby (Tremonti et al. 2004, intermediate-z (Sanders et al. 2021), and high-z (Curti et al. 2024) objects are depicted as solid, dashed and dotted, and dashed-dotted black lines, respectively. We also show the literature results for high-z sources (Nakajima et al. 2023; Curti et al. 2023; Witstok et al. 2023; Markov et al. 2023; Harshan et al. 2024; Venturi et al. 2024; Ormerod et al. 2025).