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This article has an erratum: [https://doi.org/10.1051/0004-6361/201015698e]

Fig. 4


Absorption depths calculated using IHUA models with T = 500 K and T = 1000 K for various sodium abundances ranging from [Na/H] = 10-2, 10-4, 10-6, 10-8, 10-10 (top to bottom).

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