\begin{table}%t1
\caption{\label{Table1}Basic information about \cha data sets used in this study.}
%%\centering

\small
\begin{tabular}{ c  c  c  c  c  c c }
\hline\hline
  \multicolumn{7}{c }{Clusters analyzed from \cha}\\ 
\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 1413 & 1661 & 11 55 18.20 & +23 24 28.80 & 0.142 & 0.0219 & 9749\\ 
Abell 2204 & 499 & 16 32 47.00 & +05 34 33.00 & 0.152 & 0.0567 & 11~250\\
Abell 665 & 3586 & 08 30 45.20 & +65 52 55.00 & 0.182 & 0.0431 & 28~600\\
RX J0439.0+0520 & 527 & 04 39 02.20 & +05 20 43.00 & 0.208 & 0.1070 & 10~830\\ 
Abell 773 & 533 & 09 17 59.40 & +51 42 23.00 & 0.217 & 0.0126 & 10~500\\
Abell 697 & 4217 & 08 42 53.30 & +36 20 12.00 & 0.282 & 0.0341 & 18~880\\
Abell 611 & 3194 & 08 00 56.90 & +36 03 26.00 & 0.288 & 0.0499 & 35~990\\ 
MS 1008.1-1224 & 926 & 10 10 32.33 & +12 39 32.18 & 0.306 & 0.0726 & 42~960\\
MS 2137.3-2353 & 928 & 21 40 12.70 & --23 39 27.00 & 0.313 & 0.0355 & 31~990\\ 
Abell 1995 & 906 & 14 52 50.40 & +58 02 48.00 & 0.319 & 0.0145 &  43~830\\
ZWCL 1358+6245 & 516 & 13 59 50.60 & +62 31 04.00 & 0.328 & 0.0193 & 45~420\\ 
MACS J2228.5+2036 & 3285 & 22 28 34.40 & +20 36 47.00 & 0.412 & 0.0429 & 19~700\\
MACS J2214.9-1359 & 3259 & 22 14 57.30 & --14 00 14.00 & 0.483 & 0.0328 & 17~020\\ 
MACS J1311.0-0310 & 3258 & 13 11 01.70 & --03 10 41.00 & 0.490 & 0.0188 & 15~000\\
MS 0015.9+1609 & 520 & 00 18 33.86 & +16 26 07.75 & 0.541 & 0.0407 & 66~940\\ 
MACS 1423.8+2404 & 4195 & 14 23 47.80 & +24 04 41.40 & 0.545 & 0.0238 & 113~400\\ 
MS 0451.6-0305 & 529 & 04 54 10.90 & --03 01 07.20 & 0.550 & 0.0500 & 16~370 \\
MS 0451.6-0305 & 902 & 04 54 10.90 & --03 01 07.20 & 0.550 & 0.0500 & 41~470\\ 
MACS J2129.4-0741 & 3199 & 21 29 26.20 & --07 41 27.00 & 0.570 & 0.0484 & 17~690\\
MS 2053.7-0449 & 551 & 20 56 22.40 & --04 37 43.00 & 0.583 & 0.0462 & 43~100\\
MS 2053.7-0449 & 1667 & 20 56 22.40 & --04 37 43.00 & 0.583 & 0.0462 & 43~900\\
MACS J0647.7+7015 & 3196 & 06 47 50.20 & +70 14 55.00 & 0.584 & 0.0563 & 18~850\\ 
CL 1120+4318 & 5771 & 11 20 07.60 & +43 18 07.00 & 0.600 & 0.0208 & 19~740\\
MACS J0744.8+3927 & 3197 & 07 44 53.00 & +39 27 26.00 & 0.686 & 0.0568 & 19~690\\ 
MS 1137.5+6625 & 536 & 11 40 23.30 & +66 07 09.00 & 0.782 & 0.0121 & 119~500\\
RX J1716.9+6708 & 548 & 17 16 52.30 & +67 08 31.20 & 0.813 & 0.0372 & 50~350\\ 
CL J1226.9+3332 & 3180 & 12 26 58.20 & +33 32 48.00 & 0.890 & 0.0137 & 29~470\\
\hline
\end{tabular}
\end{table}