Color-magnitude diagrams for all stars in the Sco OB1 region (left panel: (i, r − i); right panel: (H, H − K)). Only datawith errors less than 0.1 mag on colors and magnitudes are shown. Colored symbols, tracks, and isochrones as in Fig. 6. The magenta isochrone in the left panel corresponds to 1 M_⊙ stars. In the (H, H − K) diagram, dark-green dots indicate all candidate M dwarf (or PMS) stars, while black dots are candidate M giants.