\begin{table}%T7
%\centering
\small
\caption{Frequencies, amplitudes and amplitude signal/noise ratios 
obtained for the combined {$vby$} filter.\label{t7}}
\begin{tabular}{rrr}  \hline\hline
Frequency~       &  Amplitude &    {\it S/N} \\
(cd$^{-1}$)~~~&   (mmag)~~   &     ~  \\ \hline
            ~ &$\pm$0.71~~~ & ~    \\
$f_1=2.1066$ &  18.98~~~ & 9.5 \\
           4 &        ~ & ~    \\
$f_2=1.8694$ &  17.15~~~ & 8.6 \\
           5 &        ~ & ~    \\
$f_3=2.2124$ &  11.64~~~ & 5.8 \\
           7 &        ~ & ~    \\ \hline
\end{tabular}
\end{table}