\begin{table}%t1
\caption{\label{tab1}Atomic data for the europium lines considered in this work.}
\small%\centering
\par
\begin{tabular}{ccc} 
\hline\hline
Wavelength   & $\log gf$& {\it E.P.} \\ 
(nm) &  &  (eV)    \\
\hline 
 412.972& 0.22  & 0.000    \\
 604.951&--0.80  & 1.278    \\
 664.510& 0.12  & 1.379  \\
 707.709&--0.72  & 1.249  \\
 721.756&--0.35  & 1.229 \\
\hline 
\end{tabular}
\end{table}