\begin{table}%[!]%t1
\caption{\label{tablist}Observations analyzed for the clusters in the sample.}
\par
%\centering

\begin{tabular}{c c c c}
\hline \hline\noalign{\smallskip}
Cluster & Observation ID & Exposure time\tablefootmark{a} (ks) & Symbol\tablefootmark{b} \\
\hline
\object{Abell 4038} &	0204460101 &	78.1 & Black open triangle\\	
\object{Abell 2199} &  0008030201\tablefootmark{c} & 42.8 & Black open square\\
  &  0008030301 & 11.2 \\
  &  0008030601 & 11.3 \\
\object{Abell 496} &	0135120201 & 47.2 & Black open circle \\		
\object{2A0335+096} &	 0147800201 &	230.8  & Black filled triangle\\	
\object{Abell 2052} &	0109920101 &	85.1 & Black filled square\\	
\object{Abell 576} & 0205070401\tablefootmark{c} &	42.7 & Black filled circle\\
  & 0205070301 & 28.1 \\
\object{Abell 3571} &	 0086950201 &	43.5 & Blue open triangle\\ 	
\object{Abell 119} &	0012440101 &	54.1 & Blue open square\\	
\object{MKW3s} &	0109930101 &	99.2 & Blue open circle \\
\object{Abell 1644} &	0010420201 &	42.0 & Blue filled triangle\\	
\object{Abell 4059} & 0109950101\tablefootmark{c}  &	32.4 & Blue filled square\\
  &  0109950201 & 64.9 \\
\object{Abell 3558} &	0107260101 &	126.4 & Blue filled circle\\	
\object{Abell 3562} & 0105261301\tablefootmark{c}  &  116.6 & Red open triangle\\  
  & 0105261501 & 45.0  \\
  & 0105261601 & 52.5 \\
  & 0105261701 & 57.7 \\
  & 0105261801  & 23.6 \\
\object{Triangulum Australis} &  0093620101\tablefootmark{c}	&  27.3 & Red open square\\
  & 0093620201 & 8.3 \\
  & 0093620301 & 31.8\\
\object{Hydra A cluster} & 0109980301 &	52.2 &  Red open circle\\	
\object{Abell 754} & 0136740101\tablefootmark{c} &	40.6 & Light blue open square	\\
   & 0136740201 & 14.8 \\
  & 0112950401 & 31.8 \\
 & 0112950301  & 34.8 \\
\object{Abell 3266} &  0105260901\tablefootmark{c} &  66.5 & Light blue open circle \\
 & 0105262001 & 13.7 \\
 & 0105262101 & 16.2 \\
 & 0105261101 & 33.1 \\
 & 0105262201 & 9.1 \\
 & 0105261001 & 5.8 \\
 & 0105260701 & 56.4 \\
 & 0105260801 & 56.7 \\
 & 0105262501 & 17.3 \\
\object{Abell 85}&  0065140101	&	34.6  & Red filled triangle \\	
 \object{Abell 3532} & 0030140301 & 27.7 & Green filled star\\  
\object{Abell 3667} &  0206850101\tablefootmark{c} &	162.9  & Light blue open triangle \\
  & 0105260101 & 15.4 \\
  & 0105260601 & 62.5 \\
  & 0105260401 & 45.6 \\
  & 0105260301 & 47.2 \\
  & 0105260501 & 38.6 \\
  & 0105260201 & 31.8 \\
\object{Abell 2319} &  0302150101\tablefootmark{d}	& 27.6\tablefootmark{e} & Red filled square \\
  & 0302150201\tablefootmark{d} & 28.2\tablefootmark{e}  \\ 
\object{Abell 2256} &  0141380201\tablefootmark{c} & 33.1	& Light blue filled circle\\
 & 0112950601 & 25.3 \\
 & 0112951501 & 28.1 \\
 & 0112951601 & 30.9 \\
 & 0141380101 & 24.4 \\
\object{Abell 3158} & 0300210201\tablefootmark{c} &	33.2\tablefootmark{e}	& Red filled circle \\
  & 0300211301 & 14.0\tablefootmark{e}	\\
\object{Abell 1795} &	0097820101 & 97.3 & Green open triangle\\	
\object{Abell 399} &	 0112260101 &	27.9 & Green open square\\	
\object{Abell 401} &	 0112260301 &	34.7 & Green filled triangle\\	
\object{Abell 3112} &	0105660101 &	64.6 & Green filled square\\	
\object{Abell 2029} &	0111270201 &	30.8 & Green filled circle\\	
\object{Abell 2255} &	0112260801 &	25.1 & Pink open triangle\\	
\hline
 \object{Abell 1650} &	0093200101 &	75.0 & Pink open square\\	
 \object{Abell 2597} &	0147330101&	144.3 & Pink open circle\\	
 \object{Abell 478} & 	0109880101 &	136.7 & Pink filled triangle\\	
 \object{PKS 0745-191} & 0105870101 &	34.3 & Pink filled square\\	
 \object{Abell 2204} & 0112230301\tablefootmark{c} &	51.2 & Pink filled circle	\\
   & 0306490101 & 17.6\tablefootmark{e} \\
   & 0306490201 & 30.9\tablefootmark{e} \\
   & 0306490301 & 22.7\tablefootmark{e} \\
   & 0306490401 & 29.7\tablefootmark{e} \\
 \object{Abell 1689} &	0093030101 &	106.7 & Pink filled star\\
 \hline
 \end{tabular}
 \tablefoot {\tablefoottext{a} {Sum of the exposure times of the three instruments after soft protons cleaning;} 
 \tablefoottext{b}{symbols and colors used to mark each cluster in the figures of the present paper;} \tablefoottext{c}{observation used for spectral analysis in case of multiple pointings of the same object;}
 \tablefoottext{d}{we used both observations of A2319 to increase the statistics;} 
 \tablefoottext{e}{since these observations have been performed after the degradation of CCD~6 in MOS1 in 2005, we did not consider the  MOS1~detector and the exposure time given in the table is just MOS2~$+$~pn.}
 }\end{table}