\begin{table}%t2
\caption{$P$-mode frequencies for HD~160691 ($\mu$Hz). The frequency resolution 
of the time series is 1.56~$\mu$Hz. Frequencies with label~$^a$ correspond 
to peaks with a signal-to-noise ratio in the range 2.5--3 and have to be considered with
caution.}\label{tabfreq}
%\centering
\par
\begin{tabular}{lcccc}
\hline\hline
 & $l$ = 0 & $l$ = 1 & $l$ = 2 & $l$ = 3 \\
\hline
$n$ = 13 &  ....  &  ....  & 1381.8$^a$          &  ....  \\
$n$ = 14 &  ....  & 1424.5 &   ....          &  ....  \\ 
$n$ = 15 & 1478.4 & 1513.7 & 1555.1$^a$/1557.0$^a$ & 1592.9$^a$ \\
$n$ = 16 & 1562.3 & 1600.2 &   ....          & 1682.5$^a$ \\
$n$ = 17 &  ....  &  ....  & 1731.8/1734.9 & 1772.2 \\
$n$ = 18 & 1740.9 & 1780.8 & 1824.2/1826.6 & 1862.3 \\
$n$ = 19 & 1831.6 &  ....  & 1914.5          & 1954.7 \\
$n$ = 20 & 1922.0 & 1960.4 & 2005.9/2007.8 & 2042.5 \\
$n$ = 21 & 2010.1 & 2051.0 & 2094.9/2096.7 & 2132.8 \\
$n$ = 22 & 2101.0 & 2140.8 & 2182.9/2184.9 &  ....  \\
$n$ = 23 & 2189.7$^a$ & 2231.0 & 2274.4$^a$/2276.0$^a$ & 2315.7$^a$ \\
$n$ = 24 & 2280.3 & 2322.7 &   ....          &  ....  \\
$n$ = 25 &  ....  &  ....  &  ....           &  ....  \\
$n$ = 26 &  ....  & 2504.5$^a$ &   ....          &  ....  \\
\hline
\end{tabular}
\end{table}