\begin{table}%t2
\caption{Literature sources.\label{tab2}} 
%\centerline
{\begin{tabular}{lcrcc}
\noalign{\smallskip}
\hline
\hline
\noalign{\smallskip}
 Authors   & $R$ & $S/N$ & $T/g$/Fe$^{{a}}$ & Note$^{{b}}$ \\ 
\noalign{\smallskip}
\hline
1. Ryan et~al. (\cite{Ryan96}) & 38~000 & $>$100 &  p/l/l & O, T \\
2. Ryan et~al. (\cite{Ryan99}) & 40~000 & $>$100 &  p/l/l & T \\
3. Ryan et~al. (\cite{Ryan01}a,b) & 50~000 & $>$100 &  p/l/l & O, T \\
4. Bonifacio \& Molaro (\cite{Bonifacio97}) & \ldots & \ldots & p/l/l & T \\
5. Pilachowski et~al. (\cite{Pilachowski93}) & 30~000 & $>$100 & p/p/s & O \\
6. Hobbs \& Thorburn (\cite{Hobbs91}) & 30~000 & $>$100 & l/l/l & O, T \\
7. Thorburn (\cite{Thorburn94}) & 28~000 & $>$80 & p/l/l & O \\
8. Molaro et~al. (\cite{Molaro95}) & \ldots & \ldots & p/l/l & T \\
9. Spite et~al. (\cite{Spite96}) & \ldots & $>$80 & p/p/s & T \\
10. Ryan \& Deliyannis (\cite{Ryan98}) & 42~000 & $>$70 & p/p/s & O \\ 
11. Gutierrez et~al. (\cite{Gutierrez99}) & 30~000 & $>$100 & \ldots & O \\
12. Fulbright (\cite{Fulbright00}) & 50~000 & $>$100 & s/s/s & O \\
13. Ford et~al. (\cite{Ford02} )& 50~000 & $>$150 & l/l/l & O \\ 
\hline
\end{tabular}}
\par
\smallskip
\par
$^a$ \teff/\logg/[Fe/H]: l~=~literature; s~=~spectroscopy;
p~=~photometry.\\
$^b$ O~=~new set of observations; $T$~=~new \teff~scale (with
Li {\it EW} collected from literature). 
\end{table}