Positions of detected stars are marked on a gray scale, which is a MAGPIS image at 20 cm of the whole G23.3−0.3 complex (White et al. 2005; Helfand et al. 2006). Positions of Of stars are marked with asterisks, the cLBV with a plus sign, the WR found by Mauerhan et al. (2011) with a diamond, late-O and early-B types with circles, late-B and early-A stars with squares, and RSGs and cRSGs with triangles. Possible foreground early-types (A_Ks< 0.8 mag) are marked with crosses. Locations and sizes of SNRs are marked by circles. Squares and labels display the regions selected on the GLIMPSE 3.6 μm by Messineo et al. (2010) with increased nebular emission (Hii regions) and apparent overdensities of bright stars.