Fig. 13.
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Nebular phase spectrum of SN 2022ngb at +252 days post-explosion (black line), compared with synthetic spectra taken from the SN IIb models of Jerkstrand et al. (2015). The blue lines represent various models for a MZAMS = 13 M⊙ progenitor, while the red line shows a model for a 17 M⊙ progenitor. The narrow lines in the spectra are the emission lines from the H II region of the host galaxy.
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