V vs. V − I diagram obtained by using observed (top panels) and dereddened (middle panels) magnitudes and colors for the CTT and WTT cluster members with E(V − I) > 0. Solid and dotted lines are the Siess et al. (2000) isochrones and track, respectively, assuming the cluster distance of 1250 pc (Prisinzano et al. 2005). In the top panel, the isochrones are reddened by assuming the literature mean reddening E(B − V) = 0.35 (Sung et al. 2000) and the Munari & Carraro (1996) reddening laws for R_V = 5.0. In the middle panel, isochrones are only scaled for the cluster distance. The arrow indicates the reddening vector corresponding to E(B − V) = 0.35 for R_V = 5.0. The HR diagrams of the two samples are shown in the bottom panels.