\begin{table}%t3
\caption{Damping timescales of the fundamental mode standing wave for a non-equilibrium ionisation balance. The associated percentage errors are quoted in brackets.}\label{table2b}
%\centering
\small
\begin{tabular}{@{\extracolsep{\fill}}c c c c c c c}
\hline \hline
&0.5~(MK)&1.0&2.0&4.0&8.0\\
\hline
&&&&& \\[-8pt]
$2\times10^9$~cm&319(10\%)~s&153(18\%)&147(12\%)&...&...\\
$4\times10^9$&665(8\%)&540(5\%)&423(5\%)&...&...\\
$8\times10^9$&966(5\%)&968(4\%)&866(3\%)&792(13\%)&556(9\%)\\
$16\times10^9$&1395(0\%)&1499(3\%)&1534(1\%)&1414(13\%)&1116(12\%)\\
\hline
\end{tabular}
\end{table}