\begin{table}%t3
%\centering
\par
\caption{Frequencies and amplitude signal/noise ratios obtained for each 
{$uvby$} filter\label{tab3}.}
\begin{tabular}{rrrrr}  \hline\hline
Frequency~       &    $S/N(u)$ &    $S/N(v)$ &    $S/N(b)$ &    $S/N(y)$ \\
(cd$^{-1}$)~~~&~&~&~&~  \\ \hline
$f_1=5.3745$  & 44.6~ &66.8~ &65.7~ &69.9~\\
$2f_1=10.7490$ &  6.3~ & 8.1~ & 8.0~ & 8.5~\\
$f_2=5.8332$  &  5.0~ & 7.8~ & 7.9~ & 8.3~\\ \hline
\end{tabular}
\end{table}