These correlation studies show ΔpEW, the measured pEW minus the expected pEW for the corresponding epoch (for the full sample of normal SNe Ia), vs. SALT lightcurve parameter (stretch, colour) for different epoch intervals. These are given above each panel. The Spearman correlation coefficient is given in each plot. MC simulations show that the chance that these correlations are random consequences of a search through epoch ranges is one or less in 1000.
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