\begin{table}%t1
\caption{Frequency and periods for $g$ modes of different radial orders
and degree $l=1$, for a 4~$M_\odot$ star with an age of 94 Myr.}
\label{table:1}
%\centering
\par
\begin{tabular}{c c c c c c } 
   \hline\hline  
  & \multicolumn{2}{c}{$l=1$}& &\multicolumn{2}{c}{$l=2$}\\
\cline{2-3} \cline{5-6} 
$n$ &  $\nu$ ($\mu$Hz) & $P$ (d) & $n$ & $\nu$ ($\mu$Hz) & $P$ (d)  \\  
   \hline       
    23  &     6.683 & 1.732 & 40 & 6.761 &1.712   \\         
    20  &     7.728 & 1.498 & 35 & 7.730 &1.497  \\         
    15  &     9.983 & 1.159 & 30 & 9.035 &1.281  \\                  
    10  &     14.68 & 0.788 & 25 & 10.86 & 1.066 \\                 
    5   &     29.31 & 0.395 & 10 & 25.15 & 0.460  \\                 
       \hline  
\end{tabular} 
\end{table}