\begin{table}%t1
\caption{\label{tab:obslog}X-ray observation log.}
\small%\centering
\par
\begin{tabular}{lcccccc}
\hline\hline\noalign{\smallskip}
\multicolumn{1}{c}{Parameter} 		& Sep. 2002 &	& Jan. 2005 & Feb. 2005 & Mar. 2005 & Sep. 2005\\
\hline 
Satellite				& \cxc				& & \cxc	  & \xmm		  & \xmm  & \xmm  \\
ObsID					& 2548				& & 6204		  & 0212480301  	    & 0212480401		  & 0212481101 \\
Duration (ks)				& 48 				& & 5			  & 20  		    & 20			  & 20  	  \\ 
Observation date			& 2002 Sep. 6--7			& & 2005 Jan. 26 	  & 2005 Feb. 18--19	    & 2005 Mar. 21		  & 2005 Sep. 8    \\ 
UT					& 12:57--02:54			& & 03:07--05:04	  & 22:36--04:50	    & 16:20--22:08		  & 12:43--18:51  \\ 
Average JD$-$2~450~000			& 2524.3			& & 3396.7		  & 3420.6		    & 3451.3			  & 3622.2	  \\ 
 	         	               & Jan. 2006 &  Feb. 2006 &  Mar. 2006 &  Apr. 2006&  Jul. 2006 & Dec. 2007\\
  Satellite				& \cxc		       & \cxc				& \xmm			& \cxc			& \cxc 		& \cxc 	        	      \\
ObsID					& 6416 			& 6417   			& 0403200101 		&  6418 		& 6419 		& 8936 	        	      \\
Duration (ks)			        & 30 		       & 30 			        & 100		        & 30 		        & 30 		& 37.5 	        	     \\ 
Observation date		        & 2006 Jan. 4--5        & 2006 Feb. 23		        & 2006 Mar. 2--3         & 2006 Apr. 23	        & 2006 Jul. 24	& 2007 Dec. 14--15   	     \\ 
UT				        & 18:33--03:09	       & 09:41--17:47		        & 19:02--21:06	        & 14:42--23:31	        & 07:50--16:49	& 14:49--01:13  	     \\ 
Average JD$-$2~450~000	        	& 3740.5	       & 3790.2		        & 3797.8	        & 3849.3	        & 3941.0	& 4449.3       	     \\ 
\hline
\end{tabular}
\vspace*{4mm}
\end{table}