\begin{table}%t3
\caption{\label{tab3}Frequencies found in data Subset~1.}
%\centering
\par
\begin{tabular}{ccc}
\hline\hline\noalign{\smallskip}
Frequency   &  Amplitude  & Comment \\
(c~d$^{-1}$)  &  (m~s$^{-1}$)&   \\
\hline 
0.0447   &  9.23  $\pm$ 0.55 & $f_{\rm rot}$ \\
0.1108   &  4.97  $\pm$ 0.52 & $f_{3}$\\
0.2707   &  5.41  $\pm$ 0.48 & $f_{2}$\\
1.1716   &  4.74 $\pm$ 0.52  & $f_{1}$\\
0.0218   &  8.97   $\pm$ 0.57&                       \\
0.2203   &  1.92  $\pm$ 0.58 &                      \\ 
\noalign{\smallskip}%\hline
$\sigma$ = 1.98~m~s$^{-1}$ & \\
\hline
\end{tabular} 
\end{table}