$\star$ Correlation magnitude to the maximum out of U and the color

Figure 10.13 shows the correlation between the residuals to the diagram of Hubble with $U-b$. Once again, we see that the least luminous supernovæ are reddest.

Figure 10.13: Correlation enters the residuals to the diagram of Hubble out of U for $\beta = 0$ and the color (U-b)