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Fig. 6.

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Luminosity ratio versus mass ratio during the nuclear timescale MT of the 19 + 14 M systems of Sect. 4.1. Measurements from observed massive (near-)contact systems from Abdul-Masih et al. (2021), Yang et al. (2019), and Lorenzo et al. (2014) are overplotted. The systems from Mahy et al. (2020) were classified as ‘uncertain configurations’.

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