\begin{table}%t2
%\centering
\par
\caption{\label{tab:s2n}Best-fit results of the X-ray surface brightness profiles
modelled with a $\beta$-model.
$\overline{R_{200}}$ is estimated from the scaling laws in Arnaud et~al. (\cite{Arnaud2005});
$R_{200}$ from Eq.~(\ref{eqn:r200}); $R_{\rm S2N}$ and $r_{\rm c}$ are quoted
in unit of $R_{200}$.
}
\small
\begin{tabular}{l@{\hspace{.7em}} c@{\hspace{.7em}} c@{\hspace{.7em}} c@{\hspace{.7em}} c@{\hspace{.7em}} c@{\hspace{.7em}} }
\hline \hline\noalign{\smallskip}
Cluster & $\overline{R_{200}}$ & $R_{200}$ & $R_{S2N}$ & $r_{\rm c}$ & $\beta$ \\
 & kpc & kpc & $R_{200}$ & $R_{200}$ & \\ 
\hline
MS0015.9+1609 & $1770$ & $1948\pm43$ & $0.871$ & $0.137\pm0.005$ & $0.742\pm0.011$ \\
MACSJ2228.5+2036 & $1771$ & $1743\pm62$ & $0.837$ & $0.093\pm0.007$ & $0.587\pm0.013$ \\
MACS0744.9+3927 & $1622$ & $1566\pm56$ & $0.832$ & $0.045\pm0.003$ & $0.561\pm0.005$ \\
MACSJ0417.5-1154 & $1998$ & $1936\pm91$ & $0.783$ & $0.068\pm0.006$ & $0.567\pm0.010$ \\
RXJ1701.3+6414 & $1258$ & $1204\pm44$ & $0.731$ & $0.087\pm0.013$ & $0.555\pm0.020$ \\
MACSJ1720.2+3536 & $1587$ & $1617\pm42$ & $0.726$ & $0.056\pm0.004$ & $0.626\pm0.012$ \\
RXJ1416.4+4446 & $1150$ & $1133\pm38$ & $0.722$ & $0.080\pm0.010$ & $0.587\pm0.020$ \\
MACSJ2129.4-0741 & $1701$ & $1684\pm83$ & $0.712$ & $0.069\pm0.006$ & $0.592\pm0.014$ \\
MACSJ1621.3+3810 & $1538$ & $1516\pm88$ & $0.711$ & $0.048\pm0.007$ & $0.585\pm0.019$ \\
MS0451.6-0305 & $1727$ & $1995\pm52$ & $0.705$ & $0.118\pm0.005$ & $0.814\pm0.015$ \\
MACSJ1206.2-0847 & $2100$ & $2158\pm77$ & $0.703$ & $0.067\pm0.004$ & $0.638\pm0.009$ \\
\hline  
\end{tabular} 
\end{table}