\begin{table}%t1
\caption{The comparison of the $\beta$-model fitting results for the
galaxy cluster CL0016+16.}\label{fit_beta}
%\centering
\par
\small
\begin{tabular}{l l l l l l l}
\hline
\hline
 &          $\beta$-fit& (0.01--2.5 Mpc)&& $\beta$-fit by region extern &(0.3--2.5 Mpc) &\\
 %\hline
 data source & $\beta$ & $r_{\rm c}$(Mpc) & $\chi^{2}_{\rm reduced}$& $\beta$ & $r_{\rm c}$(Mpc) & $\chi^{2}_{\rm reduced}$\\
\hline
   Kotov \& Vikhlinin (2005) &  0.76 $\pm$ 0.01& 0.27 $\pm$ 0.01& 1.38 & ... & ... & ... \\
   Worrall \& Birkinshaw (2003)&  0.70 $\pm$ 0.01  & 0.23 $\pm$ 0.01 & 1.35 & ... & ... & ... \\
   Neumann \& Bohringer (1996) & 0.68 $\pm$ 0.3 & 0.28 $\pm$ 0.14& 1.02& ... & ... & ...\\
\hline
    Using  background by A. Read & 0.77 $\pm$ 0.01& 0.31 $\pm$ 0.01& 1.56&  0.80 $\pm$ 0.02& 0.34 $\pm$ 0.02& 1.35\\
    Using  background by J. Nevalainen & 0.76 $\pm$ 0.01& 0.29 $\pm$ 0.01& 1.15& 0.72 $\pm$ 0.01& 0.29 $\pm$ 0.01& 1.02 \\
    Using  the modelling \\of background from observation& 0.76 $\pm$ 0.01& 0.38 $\pm$ 0.01& 1.57&  0.81 $\pm$ 0.02& 0.38 $\pm$ 0.02& 1.21\\
%\hline
%    Similar cluster from simulation& 0.99$\pm$ 0.01& 0.240& ...& & & \\
\hline
\end{tabular}
\end{table}