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Fig. 2

image

Typical fits of the synthetic Na, Mg, and K line profiles (solid blue lines) to those in the observed 2dF/HERMES spectrum (filled red circles) of the target RGB star 47TucS2220 (Teff = 4490 K, log g = 1.8). We also indicate the abundances determined from each observed line, A(X), together with their errors (see Sect. 2.3). Thin gray lines show synthetic profiles computed with the abundances altered by ± 0.2 dex.

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