Fig. 1
PS1-10afx at phase − 5.0 d (grey line) and nearby SN Ia spectra at similar phases. When there were two spectra close to the required phase, we took the average. The black line shows the PS1-10afx spectrum rebinned by a factor of 10. The spectra were normalised at ~4000 Å. The nearby spectra are ordered according to their light-curve shape parameter Δm15(B).
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