Si abundances supported by radiative levitation without accretion. Continuous lines are the predictions for surface gravities log g = 7.50, 7.75, 8.00, 8.25 from top (green, blue, red, magenta in the color version). Small circles are the observed abundances from Table 1. The median log g of the stars with observed silicon is 7.94. See text for explanations.
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