Top: IRAC [3.6]−[4.5] vs. [5.8]−[8.0] CC diagram with boxes representing the boundaries of different classes of sources. Middle: IRAC [4.5]−[5.8] vs. [3.6]−[4.5] CC diagram with boxes representing the boundaries of different classes of sources. The Class 0/I, Class I/II, and Class II sources are marked with triangles, hexagons, and squares, respectively. Bottom: the H − K vs. K–[4.5] CC diagram. The curved solid line (blue) is the MS locus of late M-type dwarfs (Patten et al. 2006). The long solid line (red) represents the reddening vector from the tip of a M6 dwarf. The crosses represent the extra NIR-excess sources identified from this diagram, whereas the YSOs identified only with the Spitzer bands are marked in squares (Class I/II plus Class II) and triangles (Class 0/I), respectively. A reddening vector of A_V = 20 mag and mean error bars of the colors are shown in these diagrams. The mean color errors of [3.6]−[4.5], [4.5]−[5.8], [5.8]−[8.0], K–[4.5], and H − K are 0.09, 0.14, 0.16, 0.08, and 0.04, respectively.