Fig. 4
V − K versus B − V for zone 4 a), zone 2 = NGC 6357 b), and zone 6 = NGC 6334 c). The stars identified spectroscopically (see Sect. 5.2) are also overplotted (filled triangles). The small thick segment on the bottom left of the plots is the locus of the unreddened O-B3 stars (from Martins et al. 2006; Koornneef et al. 1983; and Wegner 1994).
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