Observed CMDs of open clusters, including (a − n) vs. a, (c − o) vs. c, ( f − i) vs. f, and (g − m) vs. g CMDs. The circles represent preliminary candidate cluster members. Error bars represent photometric errors. The solid black lines represent BATC isochrones with the fundamental parameters derived from the Bayesian method. The solid red lines represent isochrones with the fundamental parameters derived by Sharma et al. (2006). The solid blue lines represent isochrones with the fundamental parameters derived by Kim et al. (2001). The solid green lines represent isochrones with the fundamental parameters derived by Francic et al. (1989).