Fig. 9.
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Left panel: T[S II]–T[O II] relation for MARTA objects, compared with extragalactic H II regions together with the empirical calibration by Méndez-Delgado et al. (2023b), based on local H II regions. Right panel: T[S III]–T[O III] relation for MARTA objects, along with local H II region data and two high-redshift galaxies with archival JWST data (Rogers et al. 2024; Welch et al. 2025). The plot also shows the calibrations from Garnett (1992) and Rogers et al. (2021).
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