Fraction of the total star formation that has occurred in the previous 300 Myr, ﹩b_{300}﹩, as a function of rest‐frame ﹩u-r﹩ color, for SDSS galaxies. The gray scale is the conditional distribution of ﹩b_{300}﹩ on ﹩u-r﹩. The lines are the 10%, 25%, 50%, 75%, and 90% quantiles. For comparison we show the results of using the scaling of Hopkins et al. (2003).