Fig. 9
Unreddened color–magnitude diagram for Westerlund 2 for the parameters cited in the text, with the Wolf-Rayet stars plotted as circled yellow points, from top to bottom: WR20a, WR20b, WR20c, WR20aa, and WR21a. The red line represents the ZAMS for V0 − MV = 12.27 ± 0.33, and an arrow depicts the main-sequence gap discussed in the text.
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