Color–color diagrams using models from Robitaille et al. (2006) for disked sources with inclinations smaller than 75° for different ranges of stellar masses (M_⊙). The black solid line represents the Pleiades main sequence, the dot-dashed line corresponds to the disk locus, and the dotted lines represent the 5-σ error loci as determined by the observations of NGC 2264 (see Sect. 3.3, Fig. 8 and Table 3). The black dots represent sources with optically thick disks, and the grey circles represent sources with anaemic disks.