\begin{table}%t2
\caption{Phase-coherent ephemerides -- derived from RXTE-PCA
monitoring data -- valid for the analysed INTEGRAL observations.  }
\label{tab:rxseph}
$$
\begin{tabular}{l l l l l l l r@{.}l l}
\hline
\hline
AXP &
Start &
End &
INTEGRAL &
$t_{\rm Epoch}$ &
$\nu$ &
$\dot{\nu}$ &
 \multicolumn{2}{l}{$\ddot{\nu}$} &
$\Phi_0$ \\
 & [MJD] & [MJD] & range (Revs) & [MJD, TDB] &[Hz] & 
 $\times 10^{-13}~\rm{[Hz~s^{-1}]}$&  
 \multicolumn{2}{l}{$\times 10^{-22}~\rm{[Hz~s^{-2}]}$}& \\
\hline
\rxs1708 & 52~590 & 52~960 & 009--133 & 52~590 & 0.0908982198657
 & $-$1.58268 & 0&00 & 0.4333\\
\rxs1708 & 53~050 & 53~325 & 163--255 & 53~050 & 0.0908919724436
 & $-$1.62994 & 2&75 & 0.5025\\
\rxs1708 & 53~321 & 53~520 & 254--320 & 53~377 & 0.0908875116829
 & $-$1.49563 & $-$34&1 & 0.7559\\
\rxs1708 & 53~555 & 53~690 & 332--377 & 53~555 & 0.0908852012859
 & $-$1.77561 & 36&4 & 0.8587\\
\rxs1708 & 53~741 & 54~055 & 395--499 & 53~741 & 0.0908825979045
 & $-$1.57228 & $-$0&813 & 0.1842\\
\hline
\end{tabular}
$$
\end{table}