\begin{table}%t2
\caption{\label{Table2}Basic information about \xmm data sets used in analysis.}
\small%%\centerline

 {
\begin{tabular}{c c c c c c c} 
\hline\hline
\multicolumn{7}{c }{ Clusters
analyzed from \xmm}\\
\multicolumn{1}{ c  }{cluster name} &
\multicolumn{1}{ c  }{ Obs \#} & \multicolumn{1}{c }{ RA} &
\multicolumn{1}{c }{ Dec} & \multicolumn{1}{c }{ $ \it z$} &
\multicolumn{1}{c }{$n_{{\rm H}}$($10^{22}~\rm{cm}^{-2}$)} & \multicolumn{1}{c} {exposure time (s)} \\ 
\hline 
Abell 1763 & 0084230901 & 13 35 17.20 & +40 59 58.00 & 0.223 & 0.0082 & 19500/19500/9197\\
Abell 2390 & 0111270101 & 21 53 34.60  & +17 40 11.00 & 0.228 & 0.0619  & 13900/13900/9445\\
Abell 1835 & 0147330201 & 14 01 02.00  & +02 51 32.00 & 0.253 & 0.0204 & 78120/79450/32060 \\
RX J0256.5+0006 & 0056020301 & 02 56 29.51 & +00 05 28.70 & 0.360 & 0.0650 & 19190/19170/7914\\ 
  RX J0318.2-0301 & 0056022201 & 03 18 28.76 & --03 00 46.70 & 0.370 & 0.0505 & 20270/20340/11570 \\
RX J0426.1+1655 & 0056020401 & 04 26 04.20 & +16 55 48.50 & 0.380 & 0.1910 & 18820/18820/8337\\
 RX J1120.1+4318 & 0107860201 & 11 20 00.91 & +43 18 15.10 & 0.600 & 0.0203 & 22140/22150/16240\\ 
CL J1226.9+3332 & 0200340101 & 12 26 58.00 & +33 32 54.00 & 0.890 & 0.0138 & 77750/77780/60660\\
\hline
\end{tabular}}
\medskip
Note: the exposure times for the \xmm data sets are given in the following order: MOS1/MOS2/PN.
\end{table}