\begin{table}%t2
\caption{Oscillations extracted from the combined light curve of PG~0911+456. The uncertainty on the frequencies is estimated to be about 1/10th of the frequency resolution, i.e. around 0.02 $\mu$Hz, while the error on the amplitude is derived from the least-squares fit to the light curve. The frequencies and amplitudes detected by \citet{koen1999} are also listed.}
\label{frequencies}
\small%\centering
\par
\begin{tabular}{cccccc}
\hline\hline
Rank & Period & Frequency & Amplitude &  $f_{\rm Koen}$ & $A_{\rm Koen}$ \\
 & (s) & ($\mu$Hz) & (\%) & ($\mu$Hz) & (\%) \\
\hline
4 & 192.551 & 5193.42 & $0.082\pm0.005$ & & \\
6 & 168.784 & 5924.73 & $0.054\pm0.005$ & &\\
2 & 165.687 & 6035.49 & $0.223\pm0.005$ & 6036.2 & 0.44 \\
3 & 161.554 & 6189.89 & $0.098\pm0.005$ & 6190.9 & 0.24 \\
5 & 157.581 & 6345.92 & $0.080\pm0.005$ & & \\
1 & 155.767 & 6419.85 & $0.755\pm0.005$ & 6419.3 & 0.61 \\
7 & 149.027 & 6710.20 & $0.050\pm0.005$ & & \\
\hline
\end{tabular}
\end{table}