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Fig. 3

Comparison between the M = 30 M⊙ synthetic spectrum classified as O6V((f)), see Table A.1, shown by the red dot-dashed line and, from top to bottom, the GOSSS spectra of HD 93204 (O5.5V), HD 303311 (O6V), HD 91572 (O6.5V), and HD 93146 (O7V) (black solid lines). The GOSSS spectra are taken from Sota et al. (2011).
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