Complete spectral evolution of SN 2009dd. Wavelengths are in the observer’s rest-frame. The phase for each spectrum is relative to the adopted explosion date (JD 2 454 925.5), late spectra have been multiplied by a factor 5 to emphasise the nebular lines. The ⊕ symbols mark the positions of the strongest telluric absorptions. The ordinate refers to the top spectrum; the other spectra are shifted downwards by 4 × 10-15 (second and third) and 1.4 × 10-15 (others) erg s-1 cm-2 Å-1.
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