Color excesses. (a) δ(U−B) = (U−B)₀−(U−B)_ZAMS at a given (V−I)₀. (b) δ(B−V) = (B−V)₀−(B−V)_ZAMS at a given (V−I)₀. The crosses represent X‐ray emission stars. The dotted lines represent the color excess difference between the Z = 0.019 and Z = 0.008 models from Girardi et al. (2000). The size of the circles are proportional to the number of normal stars in the color bin [Δ(V−I) = 0.2 mag]. The error bars indicate the standard deviation of the stars in the bin. The thick solid line represents the correction applied to B−V in the calculation of distance modulus in the V vs. B−V diagram.