Fig. 1
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Normalised spectra of the MYSOs observed with GRAVITY around the 2.2 μm continuum level. The wavelength coverage contains the Brγ which is seen in emission towards all sources, and the CO bandheads which are not detected towards G301. G301 also shows some weak emission within the 2.05–2.1μm range (Fe II, He I). The narrow absorption features are spectral artefacts caused by telluric correction.
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