All Figures

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{0203fig1.eps} \end{figure}$ Figure 1: Comparison of derived [Na/Fe] for stars in common with other studies. Filled circles ( $\bullet$ ) are from Baumüller et al. (1998); crosses ( $\times$ ) are from Feltzing & Gustafsson (1998); asterisks ( $\ast$ ) are from Carretta et al. (2000); pluses (+) are from Fulbright (2000); diamonds ( $\diamond$ ) are from Gratton et al. (2003); open circles ( $\circ$ ) are from Takeda et al. (2003); triangles ( $\triangle$ ) are from Reddy et al. (2003).
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{0203fg2a.eps}\vspace*{2mm}... ....eps}\vspace*{2mm} \includegraphics[width=7.5cm,clip]{0203fg2c.eps} \end{figure}$ Figure 2: Difference of [Na/Fe] abundance ratios calculated under NLTE and LTE assumptions as a function of metal abundance a), temperature b) and luminosity c). Filled circles refer to the thin-disk stars, open circles refer thick-disk stars.
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In the text

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{0203fig3.eps} \end{figure}$ Figure 3: Abundance ratios [Na/Fe] for NLTE analyses. The meaning of the symbols is the same as in Fig. 2.
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In the text

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{0203fig4.eps} \end{figure}$ Figure 4: [Na/Mg] abundances ratios for NLTE analysis as a function of [Mg/H]. Symbols are the same as in Fig. 2.
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In the text

$\begin{figure} \par\includegraphics[width=7.6cm,clip]{0203fg5a.eps}\vspace*{3mm} \includegraphics[width=7.6cm,clip]{0203fg5b.eps} \end{figure}$ Figure 5: Top: abundance ratios [Na/Fe] for NLTE analysis as a function of [Fe/H]. Bottom: abundance ratios [Na/Mg] for NLTE analysis as a function of [Mg/H]. Filled and open circles refer to the thin- and thick-disk stars in this paper, respectively. Asterisks refer to the stars from Gehren et al. (2004).
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{0203fig6.eps} \end{figure}$ Figure 6: [Na/Fe] abundance ratios for NLTE analyses as a function of [Mg/Fe]. The meaning of symbols is the same as in Fig. 2.
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In the text

$\begin{figure} \par\includegraphics[width=7.8cm,clip]{0203fg7a.eps}\vspace*{3mm} \includegraphics[width=7.8cm,clip]{0203fg7b.eps} \end{figure}$ Figure 7: Correlation between Na abundance ratios and orbital V velocity components. Symbols are as in Fig. 2.
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In the text

$\begin{figure} \par\includegraphics[width=7.6cm,clip]{0203fg8a.eps}\vspace*{3mm} \includegraphics[width=7.6cm,clip]{0203fg8b.eps} \end{figure}$ Figure 8: Correlation between [Na/Fe] abundance ratios and peculiar space velocities $v_{\rm spec} = (U^2+V^2+W^2)^{1/2}$ ( top), and correlation between [Na/Mg] abundance ratios and peculiar space velocities $v_{\rm spec} = (U^2+V^2+W^2)^{1/2}$ ( bottom). The meaning of the symbols is the same as in Fig. 2.
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In the text

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{0203fg9a.eps}\vspace*{3mm} \includegraphics[width=7.7cm,clip]{0203fg9b.eps} \end{figure}$ Figure 9: [Na/Fe] ratios vs. stellar ages ( top), and [Na/Mg] abundance ratios vs. stellar ages ( bottom). Ages are in Gyr. Symbols have the same meaning as in Fig. 2.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{0203fg2a.eps}\vspace{2mm}... ....eps}\vspace{2mm} \includegraphics[width=7.5cm,clip]{0203fg2c.eps} \end{figure}$	Figure 2: Difference of [Na/Fe] abundance ratios calculated under NLTE and LTE assumptions as a function of metal abundance a), temperature b) and luminosity c). Filled circles refer to the thin-disk stars, open circles refer thick-disk stars.
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$\begin{figure} \par\includegraphics[width=7.7cm,clip]{0203fig3.eps} \end{figure}$	Figure 3: Abundance ratios [Na/Fe] for NLTE analyses. The meaning of the symbols is the same as in Fig. 2.
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$\begin{figure} \par\includegraphics[width=7.7cm,clip]{0203fig4.eps} \end{figure}$	Figure 4: [Na/Mg] abundances ratios for NLTE analysis as a function of [Mg/H]. Symbols are the same as in Fig. 2.
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$\begin{figure} \par\includegraphics[width=7.6cm,clip]{0203fg5a.eps}\vspace*{3mm} \includegraphics[width=7.6cm,clip]{0203fg5b.eps} \end{figure}$	Figure 5: Top: abundance ratios [Na/Fe] for NLTE analysis as a function of [Fe/H]. Bottom: abundance ratios [Na/Mg] for NLTE analysis as a function of [Mg/H]. Filled and open circles refer to the thin- and thick-disk stars in this paper, respectively. Asterisks refer to the stars from Gehren et al. (2004).
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$\begin{figure} \par\includegraphics[width=8cm,clip]{0203fig6.eps} \end{figure}$	Figure 6: [Na/Fe] abundance ratios for NLTE analyses as a function of [Mg/Fe]. The meaning of symbols is the same as in Fig. 2.
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$\begin{figure} \par\includegraphics[width=7.8cm,clip]{0203fg7a.eps}\vspace*{3mm} \includegraphics[width=7.8cm,clip]{0203fg7b.eps} \end{figure}$	Figure 7: Correlation between Na abundance ratios and orbital V velocity components. Symbols are as in Fig. 2.
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$\begin{figure} \par\includegraphics[width=7.6cm,clip]{0203fg8a.eps}\vspace*{3mm} \includegraphics[width=7.6cm,clip]{0203fg8b.eps} \end{figure}$	Figure 8: Correlation between [Na/Fe] abundance ratios and peculiar space velocities $v_{\rm spec} = (U^2+V^2+W^2)^{1/2}$ ( top), and correlation between [Na/Mg] abundance ratios and peculiar space velocities $v_{\rm spec} = (U^2+V^2+W^2)^{1/2}$ ( bottom). The meaning of the symbols is the same as in Fig. 2.
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$\begin{figure} \par\includegraphics[width=7.7cm,clip]{0203fg9a.eps}\vspace*{3mm} \includegraphics[width=7.7cm,clip]{0203fg9b.eps} \end{figure}$	Figure 9: [Na/Fe] ratios vs. stellar ages ( top), and [Na/Mg] abundance ratios vs. stellar ages ( bottom). Ages are in Gyr. Symbols have the same meaning as in Fig. 2.
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