\begin{table}%t6
\caption{\label{tab6}Frequencies found in data Subset~4 using the same
analysis as Tables~\ref{tab3}$-$\ref{tab5},  i.e. first removing the contribution of
$f_{\rm rot}$, $f_1$, $f_2$, $f_3$. Column~3 shows the amplitude
derived using fake data (see text).}
%\centering
\par
\begin{tabular}{ccc}
\hline\hline\noalign{\smallskip}
Frequency   &  Amplitude  &  Amplitude (fake)  \\
(c~d$^{-1}$)    &  (m~s$^{-1}$)  & (m~s$^{-1}$)    \\
\hline 
0.0447   & 13.79 $\pm$ 0.45 & 13.30  $\pm$ 0.43  \\
0.1108   &  2.09 $\pm$ 0.47 & 2.75   $\pm$ 0.46  \\
0.2707   &  5.90 $\pm$ 0.35 & 6.33   $\pm$ 0.42  \\
1.1716   &  4.54 $\pm$ 0.40 & 4.29   $\pm$ 0.35    \\
0.085    &  4.75 $\pm$ 0.52 & 5.21   $\pm$ 0.42  \\
\noalign{\smallskip}
$\sigma$ = 2.34~m~s$^{-1}$ & \\
\hline
\end{tabular}
\end{table}