\begin{table}%t1
\caption{\label{table1}Description of the  XRT  data used in the present study.}
%\centering
\par
\begin{tabular}{ccccc}
\hline\hline
\noalign{\smallskip}
Date & Remark & Observing period & Field-of-view   & Exposure time 	\\
     & 	      &	of time (UT)	            & (arcsec) &  (s)		\\
\hline
09/11/07 & ECH & 06:35--14:59  & $366\times366$	 & 16	\\
12/11/07 & ECH & 01:17--10:59  & $374\times374$	 & 16	\\
14/11/07 & ECH & 00:12--11:11  & $374\times374$	 & 16	\\	
16/11/07 & ECH & 18:07--23:58  & $370\times370$	 & 16	\\
16/12/08 & PCH	 & 10:02--17:52  & $362\times337$	 & 23	\\
20/09/07 & PCH 	 & 12:22--18:05  & $1018\times291$ 	 & 16	\\
10/01/09 & QS	 & 11:30--17:27  & $370\times370$	 & 23	\\
13/01/09 & QS& 11:22--17:41  & $370\times370$	 & 23	\\
29/11/07 & QS with TCH& 18:17--23:59  & $506\times506$	 & 23	\\
\hline
\end{tabular}
\tablefoot{ECH $-$ equatorial 
coronal hole, PCH $-$ polar coronal hole, TCH $-$ transient coronal hole.}
\end{table}