Fig. 4.
K-band spectrum derived from the combination of individual spectra of candidate O9.5 V stars (black) plotted against template O9.5 V spectrum (HD 37468) and synthetic spectra for 32.5 kK and 30.0 kK O dwarfs (blue; Sect. 3.1). The region of the spectrum between 2.2 μm and 2.4 μm is both predicted and found to be featureless.
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