Example of extinction-corrected CMD in the region ℓ = −6.2°, b = 9.5°. The plot represents the number of stars in bins of 0.01 mag in color and 0.1 mag in H magnitude. The extinction was assumed to be the same for all stars: the total cumulative one along the line of sight given by Schlegel et al. (1998); this is not correct for the nearby sources but, since we analyze only sources with r> 4 kpc, the use of this CMD is here appropriate. The selected F0-F5V stars are within 0.15 < (J−H) < 0.23.