differences in the profile shape with light-curve shape, we examine the different results one gets depending on the method of fitting the line profile.

suggested that  depends on the light-cure shape (and therefore peak luminosity) of the SN. Using the WISERep database [@Yaron12], we obtained most of the spectra presented by [^2]. We exclude all SNe that do not use in their final analysis, including PTF10ufj, which only has a redshift determined by SN spectral feature matching. In total, there are 14 spectra of 14 SNe Ia in the final sample. In Figure \[f:maguire\], we present median spectra from the sample. The Ca H&K feature has two clear minima (at [$\sim\!\!$ ]{}3720 and 3800 Å, respectively) in the median spectrum. These data appear to be an excellent sample for studying the Ca H&K profile shape.

![Median spectra from the sample. The black curve is the median spectrum from their full sample. In the top panel, the blue and red curves represent the median spectra taken from early and late subsamples, respectively, while in the bottom panel, they represent low and high stretch (corresponding to low and high luminosity) subsamples, respectively.[]{data-label="f:maguire"}](maguire_spec){width="3.2in"}

We also generated median spectra for subsets of the full 