Pre peak, f2 deficit vs. normal: composite spectra of “reference normal” SNe (dashed blue) compared with pEW-deficit SNe (solid red) in the epoch range −5 to 0 days past peak brightness. The shaded regions correspond to jackknife dispersion (light blue for normal, grey for deficit). The dotted orange line corresponds to the deficit composite with Cardelli et al. (1989) dust applied that matches the colour difference. The arrows indicate features discussed in the text. Mean properties of the composites are stated in the figure.
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