\begin{table}%t1
	%\centering
\par
	\caption{Formal function decribing the  pulse period during the 
	outburst. The reference for the third order polinomial fit is MJD 
	53~618. From MJD 53~629 the period is essentially constant.}
	\label{tab:period}
\par
	%
	\begin{tabular}{ccc}\hline\hline
&MJD& MJD\\
&$53~608.70-53~613.02$ &  $53~613.11-53~629$ \\\hline
$P(\s)$         & $103.3960(5)$        &$103.3883(5)$\\
$\dot{P}(\sps)$                      &--&$(-1.69~\pm{0.04})~\times10^{-8}$\\
$\ddot{P}({\rm s~s^{-2}})$     &--&$(9~\pm{3})~\times10^{-15}$\\
${\rm d}^{3}P/{\rm d}t^{3}({\rm s~s^{-3}})$&--&$(2.5\pm{0.9})\times10^{-20}$ \\\hline
	\end{tabular}
	\end{table}