Stellar mass-to-light ratios in the I band (open circles) and [3.6] (filled circles) as a function of B − V color. The models of Bell et al. (2003), Portinari et al. (2004), Zibetti et al. (2009), and Into & Portinari (2013) have been revised according to the fits in Table 4. Fits to the data (dashed lines) are given in Table 5. There is scatter in the data because the V − I and V − [3.6] colors of a galaxy vary at a given B − V. Note that the bluest galaxies falls off the graph with in the lower left plot.