\begin{table}%t2
%\centering
\par
\caption{\label{tab:tau}Impulse over unit area\protect\footnotemark[1]
equivalent to the oscillator with parameters~$A_{\rm o}=0.025$,
$P_{\rm o}=400$~s.}
\begin{tabular}{cc}
\hline \hline \noalign{\smallskip}
$\tau_{\rm o}$ [s]& $\delta p t$
%$A_p$
\\
\hline
$50$&$1.01$\\
$100$&$1.49$\\
$200$&$1.89$\\
$400$&$2.17$\\
$800$&$2.32$\\
\hline
\end{tabular}
\end{table}