Early time photometric fluxes, relative to photometric uncertainties, in the expanded training sample. Each point is a single photometric measurement, colored according to the x₁ value of the supernova it belongs to. Crosses show mean values binned by both x₁ and phase. Negative flux measurements are possible due to measurement uncertainties in difference imaging/scene modelling. Observations of SNe with x₁ values close to the center of the distribution have been made partially transparent, to emphasize the edges of the population. PS1MD and Foundation data have been excluded from this plot, as some residuals showed indications of image subtraction issues.