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Fig. 3


Depth of convection zones with temperature. The upper continuous (red) line is the position of the photosphere at Rosseland τ = 2 / 3. The three lower curves are the bottom of the convection zone for log g = 7.75, 8.00, 8.25. The two circles are the predicted depths with N(C)/N(He) = 1 for EC 20058-5234 and EC 04207-474.

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