Left:selection of optical spectra of SN 2015da with highest S/N, spectral coverage and resolution. Spectra were not corrected for extinction to facilitate the comparison at wavelengths bluer than ≃ 5000Å. Right: line identification on the + 23 d (first and second panel) and + 19 d (bottom panel) spectra. Phases refer to the estimated epoch of the explosion.
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