\begin{table}%t2
\caption{\label{tab:fit}Frequencies and amplitudes of the first moment of the Si~III~4553~\AA\
line, together with their standard errors.  The quoted errors for the
frequency are intermediate between the overestimated value given by the
frequency resolution, $1/T \sim 6\times 10^{-4}~\cpd$, and the
underestimated value given by Period04 for an ideal case free of
aliasing and for white uncorrelated noise ($6\times 10^{-6}, 6\times
10^{-6}$ and $2\times 10^{-5}~\cpd$ for~$f_1$, $f_2$ and~$f_3$,
respectively).}
\small%\centering
\par
\begin{tabular}{cccc}
\hline
\hline
      & \multicolumn{2}{c}{Frequency}            & Amplitude \\
      & (\mbox{c d$^{-1}$})  & (\muhz)           & (\kmps) \\
\hline
$f_1$ & $3.9793 \pm 0.0001$ & $46.057 \pm 0.001$ & $2.7 \pm 0.1$ \\
$f_2$ & $3.9995 \pm 0.0001$ & $46.291 \pm 0.001$ & $2.6 \pm 0.1$ \\
$f_3$ & $4.1832 \pm 0.0001$ & $48.417 \pm 0.001$ & $0.7 \pm 0.1$ \\
\hline
\end{tabular}
\end{table}