\begin{table}%t1
\caption{\label{tab.freqs}Oscillation frequencies in \taucet\ {(in \muHz)}.}
\small%\centering
\par
\begin{tabular}{c c c c c}
\hline\hline
$n$ & $l=0$ & $l=1$ & $l=2$ & $l=3$ \\
\hline
  18 &   3293.4 &          &          &          \\
  19 &   3461.7 &          &          &   3692.9 \\
  20 &   3634.5 &          &          &   3863.7 \\
  21 &   3799.3 &   3885.3 &          &   4030.3 \\
  22 &   3976.1 &   4046.8 &   4126.1 &   4202.5 \\
  23 &   4139.9 &   4222.7 &   4298.2 &          \\
  24 &          &   4388.3 &   4469.5 &   4545.1 \\
  25 &   4481.4 &          &          &          \\
  26 &   4652.3 &          &   4811.8 &          \\
  27 &   4816.2 &   4903.1 &          &   5060.5 \\
  28 &          &   5072.3 &   5151.8 &          \\
  29 &          &   5240.0 &   5317.5 &          \\
  30 &          &   5411.2 &   5492.8 &          \\
  31 &   5497.9 &          &          &          \\
\hline
\end{tabular}
\end{table}