Observed LBT spectrum (blue colour) of SN 2011fe at 294 days after the explosion (cf. Shappee et al. 2013, for the full LBT spectrum of the supernova) and the observed NOT spectrum (red colour) of SN 2014J 315 days after the explosion. No reddening or redshift correction has been made to the spectra. The recession velocities of the SNe are similar at only 241 and 203, respectively. The wavelength regions of interest for this study are marked with dashed lines and arrows. Those wavelength regions are the same as in Figs. 2 and 3. We note the general blueshift of the broad double-peak between 7000–7500 Å for SN 2011fe relative to SN 2014J, whereas for the peak between 6400–6750 Å, there is no obvious shift in wavelength. See text for further details.