Color−color diagram plotting each target’s J − H value and H − K value calculated from the corresponding JHK magnitudes listed in the 2MASS point source catalog (Cutri et al. 2003). The symbols are explained in the caption of Fig. 8. The B[e]SGs are all located on the right side of the figure, indicating the presence of dust. The other objects do not show such a large excess, with the exception of WRAY 15-751, which stands outside both groups due to a cool companion.
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