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Fig. 9

image

uTi vs. phase with markers colored by SALT2.4x1. The left andmid panels show the uTi color prior to and following F99 dereddening, respectively. The right panel displays the BSNfVSNf color evolution for reference, calculated from dereddened restframe spectra. Pre-peak observations show a scatter induced by the edge of the Ca H&K λ 3945 feature. uTi colors after peak show a strong stable correlation with light curve width.

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