\begin{table}%t1
\caption{\label{tab1}Log of the used spectroscopic observations.}
%\centerline
 {\begin{tabular}{cccccc}
\hline
\hline
    Date   & Julian date  & Stage$^{\star}$ & Region  & Observatory 
           & $T_{\rm exp}$\\
YYYY/MM/DD & JD~2~4...   &                 &  [nm]   &            
           & [s] \\
\hline
2003/10/06 & 52919.5 & HB & 330--1020 &{\it Loiano}     &~~660 \\
2003/10/10 & 52923.7 & HB & 212        &{\it XMM-OM}     &~1200  \\
2003/10/10 & 52923.7 & HB & 1.93--6.92&{\it XMM-Newton} &17~121$^\dagger$\\
1985/03/13 & 46137.8 & HB & 115--335  &{\it IUE}        &~~600 \\
1995/07/28 & 49927.5 & HB & \ion{He}{ii}~164.0&{\it IUE}&~5400 \\
2003/11/14 & 52958.5 & T  & 100--108.2&{\it FUSE}       &~4863 \\
2003/11/19 & 52963.7 & T  & 1.93--6.92&{\it XMM-Newton} &~9217 \\
2003/11/19 & 52963.7 & T  & 212--291  &{\it XMM-OM}     &~4400 \\
2004/06/15 & 53172.0 & Q  & 3.12--6.92&{\it XMM-Newton} &12~354 \\
2004/06/15 & 53172.0 & Q  & 212--291  &{\it XMM-OM}     &~4400 \\
2004/06/24 & 53181.0 & Q  & 100--108.2&{\it FUSE}       &10~832 \\
1980/05/23 & 44383.1 & Q  & 115--335  &{\it IUE}        &~2520 \\
\hline
\end{tabular}}
\par
\smallskip
$^{\star}$~Hot burst (HB), transition to quiescence (T), 
           quiescent phase (Q); 
           $^{\dagger}$~no detection of supersoft X-rays.
%
\end{table}