Near-IR color-color diagram (J−H,H−K), using both 2MASS and UKIDSS data. Symbols as in Fig. 9. The arrow indicates the reddening vector corresponding to A_V = 1. The dashed line is the adopted limit to select NIR-excess objects from this diagram. The blue lines in the lower-left part are unreddened BHAC isochrones for ages of 1, 3, 10, 30, 100 Myr, and 10 Gyr, and masses between 0.08−1.4 M_⊙. BHAC evolutionary tracks for masses of 0.1, 0.3, and 0.5 M_⊙ are shown in green.In this and following color-color diagrams, only data with errors less than 0.1 mag on each color are shown.