Panel a): comparison of the spectra of LSQ13fn with the models of Dessart et al. (2013) of various metallicity. Note that the epochs of the models refer to the number of days after explosion, whereas the epochs of LSQ13fn refer to the number of days after peak magnitude in the rest frame of the SN. Panel b): comparison of the spectra of LSQ13fn with a time-sequence of the lowest metallicity model of Dessart et al. (2013). The left-hand inset shows a zoom-in of the region of Fe ii λλ5018, 5169. The dashed red lines indicate the rest wavelengths of the two lines. The dashed black and blue lines (for LSQ13fn and the models respectively) and the shaded regions are designed to guide the eye to the absorption minima caused by the two Fe ii lines. The right-hand inset shows a zoom-in of the region encompassing Sc ii λλ5526, 5669 and Na i D.
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