\begin{table}%t1
\caption{\label{tab:lines}Characteristics of the selected spectral lines: Element, wavelength, excitation potential and estimated formation heights obtained with two models.}
%\centerline
{
\begin{tabular}{lccccccc}
\hline\hline
 El. & $\lambda$ & $W_{\lambda}$ & $EP$ & $H_{\rm d}^{1}$ & $H_{\tau}^{1}$ & $H_{\rm d}^{2}$ & $H_{\tau}^{2}$ \\
  & \AA & m\AA & eV & km & km & km & km \\
\hline
 \ion{Fe}{ii} & 4993.358 & 39 & 2.8 & 165.9 & 108.9 & 127.1 & 77.2 \\
 \ion{Fe}{i} & 4994.129 & 105 & 0.9 & 475.8 & 472.2 & 392.2 & 449.5 \\
\hline
\end{tabular}}
\smallskip
 $^{1}$  MACKKL model.\\
 $^{2}$  2D model.
\end{table}