\begin{table}%t2
\par
 \caption{\label{t2}Journal of spectroscopic observations for the H$\alpha$ and HeI lines.}
%\centerline
 {
\begin{tabular}{lcccccc}
 \hline\hline
 Date & MJD 
      & EW$^{a}$ (H$\alpha$)
                      & EW (HeI) & EW (HeI) \\
      & (\AA) & (\AA) & 6678~\AA & 7065~\AA \\
 \hline
 2007 Jun.  14 & 54265.9& $1.03\pm0.12$ 
                          &$-0.32\pm0.11$ &$-0.23\pm0.11$ \\
 2007 Jul.  18 & 54299.9& $1.66\pm0.15$ 
                          &$-0.49\pm0.10$ &$-0.12\pm0.09$ \\
 2007 Sep.  13 & 54356.9& $5.20\pm0.14$ 
                          & $0.56\pm0.11$ & $0.67\pm0.12$ \\
 2007 Oct.  05 & 54378.8& $3.22\pm0.13$ 
                          & $0.59\pm0.14$ & $0.65\pm0.09$ \\
 2007 Dec.  14 & 54448.8&$-2.46\pm0.19$ 
                          &$-0.75\pm0.36$ &$-0.69\pm0.15$ \\
 2008 Jun.  19 & 54636.9&$-2.54\pm0.18$ 
                          &$-0.61\pm0.16$ &$-0.64\pm0.27$ \\
 2008 Aug.  26 & 54704.9&$-2.32\pm0.18$ 
                          &$-0.93\pm0.32$ &$-0.71\pm0.16$ \\
 2008 Sep.  22 & 54731.0&$-2.44\pm0.16$ 
                          &$-0.75\pm0.27$ &$-0.84\pm0.18$ \\
 \hline
 \end{tabular}}
 \medskip
\par
$^a$ Positive values stand for emission line EWs whereas absorption EWs are denoted as negative. 
 \end{table}