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Fig. A.1

image

Spectral sequence of PTF12os (SN 2012P) (top panel). Comparison of the visible spectra of PTF12os to iPTF13bvn (Ib) and SN 2011dh (IIb) at approximately +20 d (bottom panel). Thick dashed lines mark the central wavelength of the marked emission lines at rest, except for the Balmer lines, which are marked by green dashed lines at 14 000 km s-1. Telluric features near the wavelengths 6860 Å  and especially 7600 Å  are present in some of the spectra.

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