([J − H] × [H − Ks]) CC diagram for all the sources detected in our GeMS FOV. The solid (fire brick) and thick dashed (dark orange) curves represent the unreddened (bottom) and reddened (top) MS and giant branches (Bessell Brett 1988), respectively. The blue solid line is the locus of intrinsic T-Tauri stars (Meyer et al. 1997). The colors of the curves and the T-Tauri line are converted to the 2MASS system using the relation given in Carpenter et al. (2001). The parallel dashed lines are the reddening vectors drawn from the tip of the giant branch (“left reddening line”), from the base of the MS branch (“middle reddening line”), and form the TTS branch (“right reddening line”). The known O or early-B stars are shown as solid dots. The NIR-excess sources identified from ([J − H] × [J−[3.6]]) and ([H–Ks] × [Ks−[4.5]]) CC diagrams are marked as polygons (see Fig. 11). The NIR-excess sources identified from this diagram are marked as squares. The error bars in the bottom right corner show average errors in the colors.
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