\begin{table}%t1
%\centering
\par
\caption{\label{tab_obs} Observation log.}
\begin{tabular}{ c c c c c c c }
\hline\hline
\noalign{\smallskip}
Instrument & Date & Start & End & Exposure & Energy range & Flux ($\times 10^{-10}$) \\
& & (UTC) & (UTC) & (ks) & (keV) & (erg s$^{-1}$~cm$^{-2}$)\\ 
\noalign{\smallskip}
\hline 
\noalign{\smallskip}
XMM/EPIC-pn &   27-02-2005 & 07:56 & 19:34 & 41.8  & 0.4--10.0 & 2.5\\
XMM/RGS1 \& 2, order 1 &27-02-2005 & 07:46 & 19:35 & 42.5  &  0.3--2.0 & 0.5\\
XMM/RGS1 \& 2, order 2 &27-02-2005 & 07:46 & 19:35 & 42.5 & 0.54--2.0 & 0.4\\
RXTE/PCA &         27/28-02-2005   & 20:37 & 02:53 & 13.0  & 6.0--25.0 & 5.9\\
RXTE/HEXTE &  27/28-02-2005 	   & 20:37 & 02:17 & 4.2   &  20--200  & 21\\
\noalign{\smallskip}
XMM/EPIC-pn & 14-03-2005 & 16:27 & 20:36 & 14.9  & 0.4--10.0 & 214\\
XMM/RGS1 \& 2, order 1 & 14-03-2005 & 16:17 & 20:37 & 15.6  &  0.3--1.0 & 2.9\\
XMM/RGS1 \& 2, order 2 & 14-03-2005 & 16:17 & 20:37 & 15.6  & 0.48--1.8 & 40\\
RXTE/PCA    & 14-03-2005 & 13:02 & 19:17 & 12.9  & 6.0--25.0 & 54\\
RXTE/HEXTE  & 14-03-2005 & 13:02 & 19:17 &  4.0  &  20--200  & 36\\
\noalign{\smallskip}
XMM/EPIC-pn & 15-03-2005 	   & 16:27 & 20:36 & 14.9  &  0.4--10.0 & 208\\
XMM/RGS1 \& 2, order 1 &15-03-2005 & 16:17 & 20:37 & 15.6  &  0.3--1.0 & 2.9\\
XMM/RGS1 \& 2, order 2 & 15-03-2005 & 16:17 & 20:37 & 15.6   & 0.48--1.8 & 40\\
RXTE/PCA    & 15-03-2005 & 14:08 & 19:26 & 11.6  & 6.0--25.0 & 48 \\
RXTE/HEXTE  & 15-03-2005 & 14:08 & 19:36 &  3.5  &   20--200 & 16 \\
\noalign{\smallskip}
XMM/EPIC-pn & 16-03-2005 & 16:14 & 20:23 & 14.9  & 0.4--10.0 & 260\\
XMM/RGS1 \& 2, order 1 & 16-03-2005 & 16:04 & 20:24 & 15.6  & 0.3--1.0  & 3.2 \\
XMM/RGS1 \& 2, order 2 & 16-03-2005 & 16:04 & 20:24 & 15.6  & 0.54--1.8 & 45 \\
RXTE/PCA    & 16-03-2005 & 17:08 & 22:37 & 11.1  & 6.0--25.0 & 70 \\
RXTE/HEXTE  & 16-03-2005 & 17:08 & 22:37 &  3.5  &  20--200  & 34 \\
\hline 
\noalign{\smallskip}
\end{tabular}
\end{table}