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Fig. 5.
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αox for donor-star-dominated UV emission for ULX systems as a function of UV (2500 Å) luminosity for our simulated ULX population (BH or NS primaries). The best fit to αox − Lν,UV simulated data in our population (black solid) at 0.2 Z⊙ and that for observed ULXs in Sonbas et al. (2019) (black points) are also shown.
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