Histograms of the step significance of the local U − V color (dark red) and stellar mass of the host (dark blue) used as a third standardization parameterin the cosmological fit. Correlations are estimated by removing 100 (top panel), 200 (middle panel), and 300 (bottom panel) random supernovæ from the initial sample of events and repeating the process a thousand times. The expected significances, assuming that it scales with ( is the total number of supernovæ in the sample) are shown as the dashed lines with the same color code.