\begin{table}%t1
\caption{\label{tab:bdata}Basic data.}
%\centering
\par
\begin{tabular}{l c c c c c c c c}
\hline \hline \noalign{\smallskip}
Group & RA & Dec & $z$ & $L_{\rm X,bol}$\tablefootmark{a} & kT & $M_{500}$\tablefootmark{b} & $R_{500}$ & $R_{\rm det}$\tablefootmark{c} \\
&     &      &   &  (erg s$^{-1}$) & (keV) & $(\times 10^{13}~M_{\odot})$ & (kpc) & $(R_{500})$ \\
\hline \noalign{\smallskip}
RXC~J0216.7-4749 & $02^{\rm h} 16^{\rm m} 45\fs0$ & $-47\degr 49\arcmin 09\farcs8$ &  0.064 & $3.2 \times 10^{43}$ & $2.05\pm0.05$ & $8.14\pm0.16$ & $645.7\pm5.0$ & 1.0 \\
RXC~J2315.7-0222 & $23^{\rm h} 15^{\rm m} 44\fs4$ & $-02\degr 22\arcmin 54\farcs4$ & 0.026 & $2.1 \times 10^{43}$ & $1.68\pm0.03$ & $5.36\pm0.37$ & $568.7\pm13.1$ & 0.73 \\
\hline
\end{tabular}
\tablefoot {\tablefoottext{a}{Bolometric ([0.001$-$100.]~keV) luminosity calculated assuming $\Omega_M = 1$, $\Omega_\Lambda = 0$ and $h_0 = 0.5$;}
\tablefoottext{b}{estimated from the $M_{500}-Y_X$~relation of \citet{app07};}
\tablefoottext{c}{ratio of the weighted effective radius of the final bin of the temperature profile,~$R_{\rm det}$, to~$R_{500}$.}}
%\vspace*{5mm}
\end{table}