Color‐color plots in the Spitzer and 2MASS wave bands. The color of the symbols is identical to that employed in Figs. 9 and 10. Panels (a), (b), and (c) show plots similar to those modeled by Whitney et al. (2003) for a variety of sources. The group 1 sources (green symbols) fall into the locii of Class 0 to Class II YSOs. Panel (d), a plot similar to Fig. 1 of Sloan et al. (2006), clearly shows the two sequences of silicate and carbon‐rich dusty evolved stars (red symbols).