JHK color-color diagrams for the different clusters. In each panel, the solid line represents the expected position of non-extincted MS stars in the diagram, and the dashed lines the direction of the extinction vector and thus the rough boundaries for extincted MS stars (crosses within the dashed lines indicate an optical extinction increase of 5 magnitudes). Sources located to the right of the right-hand dashed line and within the dotted lines are considered disk stars. Inner disk fractions, as inferred from all identified members within FOV_20pc and within FOV_2pc, (blue and red symbols, respectively), are indicated in the legends.