\begin{table}%t9
\caption{\label{table8a}Results of the frequency search in four subsets prewhitened for the wide orbit and for rotation for different mean epochs
of observation.}
%\centerline
{
\small\begin{tabular}{lllll}
\hline\hline\noalign{\smallskip}
Epoch (24...)& 48~970&49~590 & 51~370& 54~620\\
\hline
$N_{\rm JD}$        & 288         & 396         & 475         & 327        \\
$N_{\rm RV}$     & 92          & 22          & 58          & 16         \\
$f$ (\cd)    & 0.0164(2)   & 0.0297(1)   & 0.3(2)      & 0.09(15)   \\
$A$ (\kms)   & 4.5(4)      & 7.7(7)      & 3(3)        & 6(6)       \\
$f_{\rm H}$ (\cd)  & 0.0160(2)   & 0.0162(6)   & 0.0165(1)   & 0.0166(3)  \\
$A_1$  (\kms)& 4.5(4)      & 4(2)        & 2.4(6)      & 8(3)       \\
$A_2$ (\kms) & 1.5(4)      & 6(1)        & 2.6(5)      & 7(2)       \\
\hline
\end{tabular}}
\end{table}