All Figures

$\begin{figure} \par\includegraphics[width=7cm,clip]{8342fig1.eps}\end{figure}$ Figure 1: The profiles of the five selected iron lines after rescaling. Their mean (solid line) and the median profiles are practically identical.
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In the text

$\begin{figure} \par\includegraphics[width=7cm,clip]{8342fig2.eps} \end{figure}$ Figure 2: Asymmetry expected on the main component of the ⁷Li doublet from the mean profile of the 5 iron lines of Fig. 1. The asymmetric profile is represented by red circles. The symmetric profile of the blue wing is represented by green circles. The excess absorption in the true profile compared to the symmetric red wing is shown with the continuum shifted to 1.04 for clarity. The effect of a ⁶Li blend corresponding to a ⁶Li/⁷Li of 4% is also shown, with the continuum at 1.02, as reference. The two features are strikingly similar, both in size and position. The full red dots mark the line bisector.
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In the text

$\begin{figure} \par\includegraphics[width=7cm,clip]{8342fig3.eps}\end{figure}$ Figure 3: Upper panel: the observed Li doublet (black dots with error bars), together with the best fitting synthetic profile (red solid line) computed using the empirical profile derived from the Fe I lines. The green dashed lines show the ⁷Li components and the blue dashed lines the ⁶Li components. Fitting parameters are the contributions of ⁷Li and ⁶Li and thermal broadening, but no global wavelength shift was allowed. See text for details. Lower panel: like upper panel, but also allowing for a global wavelength shift, the best fit corresponds to a shift of 372 ${\rm m~ s^{-1}}$ .
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8342fig4.eps}\end{figure}$ Figure 4: Profile of a single component of ⁷Li computed with Linfor3D in LTE. It is based on the average over 11 snapshots from a $\ensuremath {{\rm CO}^5{\rm BOLD}}$ model atmosphere run with $T_{\rm eff} =6375$ K, $\log~(g)= 4.0$ , [Fe/H] = -2.0. The asymmetry is characterised by the difference between the red wing (circles) and the mirror image of the blue wing (blue circles) The area between both is shown in red at the top, as in Fig. 2. The asymmetry is 3% in area, and the convective line shift is 100 m/s to the red.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8342fig5.eps}\end{figure}$ Figure 5: Like Fig. 4 but for the case of 3D-NLTE. The convective shift is 3 times larger and the area asymmetry slightly less.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8342fig6.eps}\end{figure}$ Figure 6: The contribution functions of the (disk-centre) equivalent width of the Li I 6707.8 Å line (solid lines, left ordinate) and of the (disk-centre) continuum intensity (dotted line, right ordinate) in 3D-LTE and 3D-NLTE. Note the double peak in the equivalent width contribution function in 3D-LTE for the Li line. The peak at the surface is due to an increased LTE population of the levels at the low surface temperatures reached in the 3D model. In 3D-NLTE, the departures from LTE completely annihilate this peak and strengthen the inner peak.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8342fig7.eps}\end{figure}$ Figure 7: Comparison between empirical and 3D-NLTE profile.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8342fig8.eps}\end{figure}$ Figure 8: Fit with 3D-NLTE profile providing ⁶Li/⁷Li = 0.6%.
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In the text

$\begin{figure} \par\includegraphics[width=7cm,clip]{8342fig1.eps}\end{figure}$	Figure 1: The profiles of the five selected iron lines after rescaling. Their mean (solid line) and the median profiles are practically identical.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8342fig5.eps}\end{figure}$	Figure 5: Like Fig. 4 but for the case of 3D-NLTE. The convective shift is 3 times larger and the area asymmetry slightly less.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8342fig7.eps}\end{figure}$	Figure 7: Comparison between empirical and 3D-NLTE profile.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8342fig8.eps}\end{figure}$	Figure 8: Fit with 3D-NLTE profile providing ⁶Li/⁷Li = 0.6%.
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