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Fig. 2.
(FUV − NUV)−(g − r) color–color diagram. Stars in the SF18 sample are shown as black dots with error bars. Lines denote theoretical models as indicated in the legend. Models with H/He mixtures correspond to logg = 8. The H/He models with log(NH/NHe) = −5.4 reproduce all data of stars in the SF18 sample.
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