\begin{table}%t1
%\centering
\par
\caption{Log of the four \sax\ NFI observations presented in
this work.\label{t:log}}
\begin{tabular}{cclcccccc}
\noalign{\smallskip}
\hline\hline
Source & Obs.& \multicolumn{1}{c}{Start time (UT)} & End time (UT) &
LECS &  MECS& HPGSPC & PDS & 2--10~keV MECS\\
 & & & &ksec &ksec &ksec &ksec  & count rate (s$^{-1}$)\\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
X1543--624 & 1 & 1997 Feb 21 09:38:02 & 1997 Feb 21 17:39:50  & 6.6 & 16.6 & 7.5 & 7.5 & 12.8\\
            & 2 & 1997 Apr ~~1 22:38:29  & 1997 Apr ~~2 05:54:05  & 6.6 & 18.3 & 7.8 
& 8.1 &11.4\\
\noalign{\smallskip}
\noalign{\smallskip}
\noalign{\smallskip}
\noalign{\smallskip}
X1556--605 & 1 & 1997 Mar 10 17:10:02  & 1997 Mar 10 23:58:50 &7.3 & 17.9 &7.9 &7.9 
         & 5.42\\
  & 2 & 1997 Apr ~~3 18:08:47  & 1997 Apr ~~4 01:54:50 & 5.1 & 17.8 & 7.3 
& 7.7 & 5.69\\
\hline
\end{tabular}
\end{table}