\begin{table}%t1
    \caption{Observed mean periods of the three detected oscillation frequencies with their corresponding mean amplitudes. The first two~periods are reported by \citet{Eloy92rvari}, and the third one is proposed by \citet{Pocs02}. The last column gives the frequency \mbox{ratio}~$f_1/f_{i=2,3}$.}\label{tab:freqobs_mean}
%\centering
\small
    \begin{tabular}{cccccc}
    \hline
    \hline
  Frequency     &   $P$(d)   &   $\nu$(c/d) & $\nu$($\muHz$)   & $A_{\rm v}$ (mag)  &  $f_1/f_{i=2,3}$  \\
    \hline
  $f_1$ &  0.0931   &    10.738   &      124.233      &    0.308     &                    \\
  $f_2$ &  0.0720   &    13.898   &      160.856      &    0.091     &  0.772             \\
  $f_3$ &  0.0735   &    13.611   &      157.542      &    0.016     &  0.788             \\
    \hline
  \end{tabular}
\end{table}