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Fig. A.1.
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LTE profile of the Si line in HE 1413-1954 computed with A(Si) = 3.7, 4.3, and 4.8 (blue lines) and with the best-fit value A(Si) = 4.01 (red line). The NLTE value of A(Si) = 5.09 would in this figure correspond to an LTE A(Si) value of about 4.8, which is incompatible with the observed profile,
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