Fig. 7.
Normalized (divided by the median flux between 8000 and 8400 Å) spectra of iPTF15dtg (black), SN 2011bm (blue), SN 2010mb (red), SN 1998bw (green), SN 2004aw (orange), and SN 2014C (blue-green) at nebular epochs. All spectra were corrected for extinction. The main features are marked as in Fig. 5. The phases are reported for each SN. Supernova 2010mb is clearly different as its continuum is remarkably bluer than for the other SNe. Supernova 2014C shows strong Hα emission.
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