Color-coded stellar number density distributions (in base 10 logarithmic scale) in the ﹩{T}_{\mathrm{eff}}﹩–﹩{M}_{V}﹩ plane for stars in three [Fe/H] bins. Y² isochrones of ages 1, 2, 4, 6, 10, and 14 Gyr are overplotted. The top and middle panels show LSP3 estimates of ﹩{T}_{\mathrm{eff}}﹩ with the weighted-mean and the KPCA method, respectively. The bottom panels show the same as the middle panels, except that the overplotted isochrones have been calibrated to the temperature scale of Huang et al. (2015).