\begin{table}%t4
%\centering
\par
\caption{\label{tab:lit}Methods adopted by the reference papers cited   in the text to calculate the atmospheric parameters.}
\small \begin{tabular}{cccccc}
\hline\hline
Reference & Temp.  & Surface gravity & Microt. & Model atm. & LTE/NLTE? \\
\hline
F00 & Exc. Eq. of \ion{Fe}{i} lines & Ion. Eq. \ion{Fe}{i} and
\ion{Fe}{ii} & \ion{Fe}{i} lines & Kurucz + overshooting & LTE \\
 & $\log$ ($EW$/$\lambda$) $\leq - 4.80$ & $\log$ ($EW$/$\lambda$) $\leq$
$-$4.80 & & & \\
SB02 & Exc. Eq. of \ion{Fe}{i} lines  & Average of Ion. Eq. of &
\ion{Fe}{i} lines & Kurucz  & LTE \\
& $\log$ ($EW$/$\lambda$) $\leq$ $-$5.15  & \ion{Fe}{i}/\ion{Fe}{ii}
and \ion{Ti}{i}/\ion{Ti}{ii} & agrees with Ed93 relation  & Castelli et~al. (\cite{Cas97}) & \\ 
NS97 & Exc. Eq. of \ion{Fe}{i} lines & Ion. Eq. \ion{Fe}{i} and
\ion{Fe}{ii} & \ion{Fe}{i} lines & (NEW)MARCS (Ed93) & LTE \\
& $\log$ ($EW$/$\lambda$) $\leq$ $-$5.15 &  & with $\chi \geq 4$~eV & & \\
Ed93 & Str\"omgren photometry & Balmer discontinuity &  Empiric
relation &  (NEW)MARCS &  LTE \\
& calib. of $(b-y)$ and $\beta$ & index, c$_{1}$ & dependent
on $T_{\rm eff}$ and $\log~g$ &  & \\
\hline
\end{tabular}
\end{table}