\begin{table}%T1
%\centering
\small
\caption{Spectral lines used in this study. Lines are given
depending on their forming region: from the upper part to the lower
part of the atmosphere. Line-forming regions have been determined
using the hydrodynamical model defined by $\tau_{\rm l}=2/3$ where
$\tau_{\rm l}$ is the optical depth at the centre of the line (see Fig.~\ref{Fig_V4raies_a}). The line depth (in percentage of the
continuum) is indicated. \label{Tab_Lines}}
\begin{tabular}{lcc}
\hline \hline 
\par
Name                 &   Wavelength (\AA)        &   Line depth  \\
                     &                           & (\% of the continuum) \\
\hline
\par
\ion{Fe}{i}   &   6003.012   &  18 \\
\ion{Fe}{i}   &   6056.005   &  16  \\
\ion{Fe}{i}   &   6380.743   &  9  \\
\ion{Ni}{i}   &   6378.247   &  5 \\
\hline 
\end{tabular}
\end{table}