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Fig. 3
Comparison of the 8700–8900 Å spectra of W239 (solid line) and the O+O SB2 binary W30a (dotted line). W239 appears to demonstrate a similar weak, broad Pa12 profile at ~8500 Å as W30a. The weakness of this feature is apparent upon consideration of the single O9.5 Ib cluster member W74.
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