\begin{table}%t1
%\centering
\par
\caption{\label{infos}Observational information.}
\begin{tabular}{ccccccccc}
\hline\hline\noalign{\smallskip}
Cluster & RA  & Dec & $z$ & Detector & Exposure time & Soft band\tablefootmark{\ast}  & Hard band$^{\ast}$ & $n_{\rm H}$\tablefootmark{\ddag}\\
   & (J2000) & (J2000) &  &  & (ks)& (keV) & (keV) & ($10^{20} ~\rm cm^{-2}$)\\
\hline
Abell 85 	&	00:41:37.80     &  --09:20:33.0 	& 0.055 & ACIS-I & 38.91 & 0.3--1.4 & 1.4--6.0  & 2.78\\
Abell 426       &	03:19:48.20	&  +41:30:42.2	& 0.018	& ACIS-S & 98.20 & 0.3--1.4 & 1.4--6.0  &13.6 \\
Abell 496       &	04:33:37.00	& --13:14:17.0	& 0.033	& ACIS-S & 76.08 & 0.3--1.3 & 1.3--6.0  & 3.78 \\
Abell 3376      &	06:02:10.00	& --39:57:21.0	& 0.046	& ACIS-I & 44.85 & 0.3--1.5 & 1.5--6.0  & 4.58\\
Abell  754      &	09:09:09.00	& --09:39:39.0	&0.054	& ACIS-I & 44.77 & 0.3--1.5 & 1.5--6.0  & 4.82\\
Hydra A         &	09:18:05.70	& --12:05:42.5	&0.013	& ACIS-S & 100.13 & 0.3--1.2 & 1.2--6.0 & 4.60\\
Centaurus	&	12:48:48.90	& --41:18:44.4	&0.011	& ACIS-S & 90.19 & 0.3--1.2 & 1.2--6.0  & 8.56\\
Abell 1644      &	12:57:33.00	& --17:20:28.0	&0.047	& ACIS-I & 52.17 & 0.3--1.6 & 1.6--6.0  & 4.11\\
Abell 1991      &	14:54:31.50	& +18:38:32.0	&0.059	& ACIS-S & 38.81 & 0.3--1.1 & 1.1--6.0  & 2.46 \\
Abell 2052      &	15:16:44.50	& +07:01:16.6	&0.035	& ACIS-S & 128.63 & 0.3--1.2 & 1.2 6.0 & 2.71\\
Abell 2107      &	15:39:39.00	& +21:46:58.0	&0.041	& ACIS-I & 36.04 & 0.3--1.5 & 1.5--6.0  & 4.45\\
Ophiuchus	&	17:12:27.80	& --23:22:11.5	&0.028	& ACIS-S & 51.18 & 1.3--4.0 & 4.0--7.0  & 40.0\\
Abell 3667      &	20:13:07.25	& --56:53:24.0	&0.056  & ACIS-I & 105.01 & 0.3--1.6 & 1.6--6.0 & 4.44\\
Abell 4059      &	23:57:00.70	& --34:45:33.0	&0.047	& ACIS-S & 93.34 & 0.3--1.2 & 1.2--6.0  & 1.21\\
Abell 2589      &	23:23:57.40	& +16:46:39.0	&0.041	& ACIS-S & 54.13 & 0.3--1.3 & 1.3--6.0  & 3.15 \\
\hline
\end{tabular}
\tablefoot{\tablefoottext{\ast}{Soft and hard bands used to construct the hardness ratio maps.} 
\tablefoottext{\ddag}{Hydrogen column densities adopted to construct HR \citep{DL90}.}}
%\vspace*{4mm}
\end{table}