Fig. 1.

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Hertzprung-Russell diagram for the entire BLOeM survey with highlighted early B-type supergiants that have been selected for study in the present work (marked with orange star symbols, 262 in total). Non-rotating stellar evolutionary tracks represent the evolution of single stars at SMC metallicity calculated by Schootemeijer et al. (2019) with mass-dependent overshooting (described in Appendix B of Hastings et al. 2021).
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