\begin{table}%T1
\caption{Log of the X-ray pointings on 4U~1954+31 analyzed in
this paper.}\label{t1}
%\centerline
 {\small
\begin{tabular}{llccrl}
%\noalign{\smallskip}
\hline
\hline
%\noalign{\smallskip}
\multicolumn{1}{c}{Satellite} & \multicolumn{1}{c}{Obs. start} &
Obs. start & \multicolumn{1}{c}{Exposure} & 
\multicolumn{2}{l}{On-source time (ks)} \\
 & \multicolumn{1}{c}{date} & time (UT) & \multicolumn{1}{c}{(ks)} & & \\
%\noalign{\smallskip}
\hline
%\noalign{\smallskip}
{\it EXOSAT}   & 22 Oct. 1983 & 21:50:00 &   15.2 & 14.7 & (GSPC)\\
               &             & 21:53:04 &   14.8 & 13.4 & (ME)$^*$\\
               & 02 Jun. 1985 & 06:54:08 &   16.3 & 14.8 & (GSPC)\\
               &             & 06:57:20 &    5.3 &  5.2 & (ME)\\
               &             & 08:37:36 &   10.2 &  8.9 & (ME)\\
%\noalign{\smallskip}
{\it ROSAT}    & 04 May 1993 & 12:28:52 &  98.1  &  7.9 & (PSPC B)\\
%\noalign{\smallskip}
{\it RXTE}     & 14 Dec. 1997 & 03:44:11 &   15.0 &  8.4 & (PCA)\\
               &             & 03:44:11 &   15.0 &  2.6 & (HEXTE)\\
%\noalign{\smallskip}
{\it BeppoSAX} & 04 May 1998 & 22:05:14 &   92.4 & 20.0 & (LECS)\\
	       &	     & 22:05:14 &   92.4 & 46.4 & (MECS)\\
 	       &	     & 22:05:14 &   92.4 & 20.0 & (HPGSPC)\\
	       &             & 22:05:14 &   92.4 & 21.0 & (PDS)\\
%\noalign{\smallskip}
{\it Swift}    & 19 Apr. 2006 & 21:02:10 &    7.1 &  2.5 & (XRT)\\
\hline
\end{tabular}}
\medskip
\par
$^*$ Results from this observation were partially
presented by Cook et~al. (\cite{Cook84}).
\end{table}