Spectral evolution of SN 2010aj. Wavelengths are in the observer’s rest frame. The phases reported to the right are relative to the explosion epoch (JD 2 455 265.5), The late spectrum has been multiplied by a factor 4 to emphasise the features. The ⊕ symbols mark the positions of the strongest telluric absorptions. The ordinate refers to the top spectrum; other spectra are shifted downwards with respect to the previous one by 2 × 10-16 and 6 × 10-16 (only the third) erg s-1 cm-2 Å-1.
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