Fig. 5
Left panel: colour − magnitude diagram compiled from the OM photometry of Cyg OB2. Right panel: (J − K,K) near-IR colour − magnitude diagram (as Fig. 4) of the 2MASS counterparts of the OM sources that are detected in both UV filters. The F-type star indicated in these figures is Cyg OB2 #72 (=MT91 664, Massey & Thompson 1991).
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