\begin{table}%t2
\par
%\centering
\par
\caption{Power across the line profile of the most significant high-degree
modes in the three seasons.\label{tab2}}
\begin{tabular}{rrrr}
\hline\hline
\noalign{\smallskip}
Freq.&\multicolumn{3}{c}{$Power$}\\
\cline{2-4}
[\cd]  &1995&1996& 1998\\
\hline
1.47 &6.7~$\pm$~0.1&3.1~$\pm$~0.2& 2.5~$\pm$~0.2 \\
13.85 & 9.7~$\pm$~3.9 & 10.8~$\pm$~4.3 & 10.7~$\pm$~3.3 \\
14.38 & 5.6~$\pm$~0.7&7.3~$\pm$~2.6 & 3.5~$\pm$~1.2 \\
14.62 & 11.4~$\pm$~0.9& 2.9~$\pm$~0.9 & 1.4~$\pm$~0.3\\
14.94 & 10.6~$\pm$~3.8 & 7.5~$\pm$~2.6 & 5.9~$\pm$~2.3 \\
17.28 & 4.1~$\pm$~0.5 & 1.2~$\pm$~0.2 & 12.0~$\pm$~1.2\\
\hline
detect. thres.& 4.8 & 3.0 & 2.0\\
\hline
\end{tabular}
\end{table}