Fig. 6.
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Oxygen core mass estimated from the measurement of the [O I] doublet for phases 287, 360, and 396 days (horizontal lines). Oxygen production yields published by Nomoto et al. (1997), Rauscher et al. (2002), Limongi & Chieffi (2003), Ertl et al. (2020), and Limongi et al. (2025) point to an initial mass of 12 − 15 M⊙ for the progenitor star.
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