\begin{table}%t6
\caption{The best-fitting results of the 2D $\beta$-model, from the XMM-Newton and Chandra data}
\label{2dbeta} %\centering
\par
\small
\begin{tabular}{l l l}
\hline\hline
Parameter& Best-fitting \\
& XMM & Chandra\\
\hline
$R_{c1}$(Mpc)& 0.291 & 0.237 \\
$R_{c2}$(Mpc) & 0.364 & 0.295\\
$\beta$ & 0.79 & 0.79\\
PA & 2.24 & 2.33\\
RA & 00:18:33 & 00:18:33\\
Dec & 16:26:06& 16:26:11\\
\hline
\end{tabular}
\end{table}