Fig. 2.
Montage of spectra of isolated O hypergiants. Template spectra are overplotted in red along with identifications; we also show the spectrum of F16, the WN8-9ha star with the weakest emission lines within the Arches (Clark et al. 2018a), for comparison to P100 and 107. We note that a narrow emission feature of uncertain origin at line centre of Brγ in the spectrum of P114 was removed, leaving an artificially flat topped profile.
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