IRAC color−color diagram of 91 026 YSO candidates located at less than four times the effective radius (Reff) of the 1360 bubbles. The solid and dashed lines represent the respective boundaries of Class I and II sources, following Allen et al. (2004). The red and yellow dots represent the Class I (10 694) and Class II (18 209) YSO candidates selected based on both their spectral indices and position on the diagram, respectively. The reddening vector of AV = 20 mag was derived from the extinction law of Indebetouw et al. (2005).
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