Offsets of the dereddened colors from the actual intrinsic colors when the Ophiuchus extinction law (see Sect. 2.2) is used in dereddening the observed IRAC colors. The offsets are for 150 randomly chosen SEDs from 80 284 samples that have disk inclinations of 18°, 50°, 81°, and 87° in the catalog of Robitaille et al. (2006). The intrinsic colors are marked with black dots. We apply extinctions of AKS = 1, 4, and 8 mag to the chosen SEDs, calculate their synthetic IRAC magnitudes, then deredden the magnitudes using the Ophiuchus extinction ratios. Blue lines connect the intrinsic color and the simulated, dereddend color for AKS = 1 mag of each SED, yellow lines connect the dereddend colors for AKS = 1 and 4 mag, and red lines connect the dereddend colors for AKS = 4 and 8 mag. The arrows in the upper-left corners indicate the reddening vector for the Ophichus extinction ratios for AKS = 2 mag. The solid and dotted lines indicate the Class II, Class I/II, and Class 0/I areas in the IRAC CC diagram as suggested by Allen et al. (2004) and Samal et al. (2012).
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