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Fig. 5

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Hertzsprung-Russell diagram showing mass estimates derived from luminosity fits to evolutionary tracks (Brott et al. 2011; Friedrich et al., in prep.). The red circle indicates the best fit for the total luminosity of the R139 system, while the blue squares show the fit for the luminosity of the two components based on the mass ratio and assuming the objects are coeval. From these it is possible to infer the initial masses, see text for further details.

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