Lithium line spectroscopic region of the turn-off star S1275: a) observation (dotted line) and synthetic spectra computed with the atmospheric parameters listed in Table 2, and with ALi= 2.10, 2.15, 2.20 dex (dashed, solid and dashed-dot lines respectively). The best synthetic spectrum is clearly the one computed with ALi= 2.15. b) Residual difference between synthetic and observed spectra.
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