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Fig. 4
Infrared excess using the three IRAC magnitudes at 3.6, 5.8, and 8.0 μm and J band from 2MASS (in a few cases from IRSF when no 2MASS value was available). Blue triangles mark sources from class VI (flag “oi:”), green squares those from class IV (with additional flag “em”), while red circles indicate flag “oi”.
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