Fig. 4
Two-color diagram for stars in Sex A (from Massey et al. 2007), which is a useful tool for distinguishing RSGs from foreground giants (Massey 1998). The positions of our investigated targets are labeled using different symbols. All targets in Sex A that satisfy our selection criteria (see Sect. 2.1) are marked by black squares; the majority lie on the upper, RSG branch.
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