(b–y) vs. T_eff (upper left panel), [Fe/H] (upper right panel), and V magnitude (lower left panel, with a dot-dashed line at (b − y)_⊙). The results of the global fit vs. the observed (b − y) color is presented in the lower right panel, with the dotted line indicating equality. Solar twins and solar analogs are represented by filled and open circles, respectively. The dependences of the fit on T_eff and [Fe/H] are shown by dashed lines, while the relative predictions of MARCS models (normalized to our inferred solar colors) are shown by solid lines.