Fig. 8.
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R3 versus 12 + log(O/H) and R23 vs. 12 + log(O/H) with calibrations from Hirschmann et al. (2023; black, dot-dashed) and photoionization models from Pérez-Montero (2014). We investigate N/O values of −2.0 (purple), −1.0 (green), and 0.0 (red), and log(U) values of −1.5 (dashed), −2.5 (solid), and −3.5 (dotted). Symbols are the same as in Fig. 4.
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