Left: color similarity index S_C plotted versus the final photometric T_eff (obtained from the spectroscopic [Fe/H]) and the spectroscopic [Fe/H] for all spectroscopically analyzed stars. The vertical colored bar is coded by the S_C values: note that the scale of the coding is different between the two plots. Right: same as the left panel, but for the stars with S_C ≤ 3.0. It is clear that a combination of hot/metal rich and cool/metal poor parameters defines an area of good photometric similarity to the Sun, and also that the stars with the highest color similarity to the Sun have atmospheric parameters more tightly clustered around the solar values.