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Fig. 2.


Location of the B star component of the LB-1 system in the Kiel (left) and HR (right) diagrams. The various evolutionary tracks correspond to models with and without rotation from Ekström et al. (2012, orange) and Brott et al. (2011, blue). The Kiel diagram also indicates the location of the star according to the parameters derived by Liu et al. (2019) and Abdul-Masih et al. (2019). The HR diagram shows the position of the star assuming the Gaia distance computed in Appendix D.

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