\begin{table}%t2
\caption{Quality of the fits evaluated by typical equivalent signal-to-noise ratio 
$\langle eqS/N \rangle$ and typical value of $\langle \chi^2 \rangle$
computed as time ave\-rages along the slit.}
\label{tab2}
%\centering
\small
\begin{tabular}{llrr}
\hline\hline
% & & &  \\[-8pt]
\multicolumn{2}{c}{line [\AA]} & \multicolumn{1}{c}{$\langle eqS/N \rangle$} & \multicolumn{1}{c}{$\langle~\chi^2 \rangle$} \\
\hline
% & & &  \\[-8pt]
\ion{Fe}{i}   &  4992.8  & 113.4 &  9.8 $\times$ $10^{-5}$         \\
\ion{Fe}{ii}  &  4993.3  &  85.7 & 17.4 $\times$ $10^{-5}$         \\
\ion{Fe}{i}   &  4994.1  &  68.9 & 28.2 $\times$ $10^{-5}$         \\
\ion{Ca}{i}   &  6455.6  & 135.1 &  8.8 $\times$ $10^{-5}$         \\
\ion{Fe}{ii}  &  6456.4  & 114.3 & 11.0 $\times$ $10^{-5}$         \\             
\hline
\end{tabular}
\end{table}