Observed line profiles (black solid lines) and best-fit 3D, NLTE synthetic profiles. The projected rotational velocity has been constrained by calibration lines. Below each panel the flux residual (observed-synthetic) in per cent is shown. The three line profiles correspond to the best-fit value indicated in the plot (solid line), 6Li / 7Li = 0.0 (dashed line) and 6Li / 7Li = 0.05 (dotted-dashed lines). The estimated observational uncertainty per pixel is also indicated (dotted horisontal lines).
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