Nebular spectra of PTF12os (top panel) and iPTF13bvn (middle and bottom panels) compared with nebular models. For PTF12os we show a flux-calibrated nebular spectrum (black line) obtained at +215 d. Nebular models with MZAMS = 13M⊙ (gray line) and MZAMS = 17M⊙ (red line) are also shown, along with a model scaled in oxygen mass to represent a star with MZAMS = 15M⊙ (green line). The observed spectrum is consistent with the model representing MZAMS = 15M⊙. For iPTF13bvn we show three flux-calibrated spectra, one observed at +251 d (black line, middle panel), one at +345 d (gray line, bottom panel) and one at +346 d (black line, bottom panel). These spectra are consistent with a model having MZAMS = 12M⊙ (green lines). All models have been scaled to the epochs of the spectra according to the prescriptions of Jerkstrand et al. (2015).
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