\begin{table}%t1
\caption{The best-fit free parameters of RXC~J2228.6+2036 for the
single-temperature model: the temperature $T$, the abundance $A$, and the 
normalized constant $norm$ for the simultaneously fitting of pn and MOS. 
$norm = 10^{-14}/(4\pi (D_{\rm A}\times(1+z))^2) \int n_{\rm e} n_{\rm H} {\rm d}V$, where $D_{\rm A}$ is 
the angular size distance to the source (cm) and $n_{\rm e}$ is the electron 
density (cm$^{-3}$). $L_{\rm bol}$ represents the bolometric luminosity ($0.01$$-$$60$~keV) in the units of $10^{44}$~erg~s$^{-1}$. The errors represent a confidence 
level of 90\%.}
\label{tablefit}
%\begin{center}

\begin{tabular}{cccccc}
\hline\hline
 $r$($'$) & $T$ (keV) & $A$ (solar)& $norm$~($10^{-3}$ cm$^{-5}$)
& $\chi^{2}_{{\rm red}}$/${\rm d.o.f.}$ & $L_{\rm bol}$($10^{44}$ erg s$^{-1}$)
\\
\hline
$0.0$$-$$0.5$ & $8.26^{\rm +1.02}_{-0.92}$ & $0.31^{\rm +0.19}_{-0.18}$ & $0.72\pm0.03$ & 
1.12/251 & $4.65^{\rm +0.38}_{-0.31}$
\\
$0.5$$-$$1.0$ & $11.65^{\rm +2.54}_{-1.78}$ & $0.20^{\rm +0.27}_{-0.2}$ 
 & $0.88\pm0.05$  & 1.02/262 & $6.73^{\rm +0.58}_{-0.76}$
\\
$1.0$$-$$1.75$ & $9.03^{\rm +1.82}_{-1.27}$ & $0.30^{\rm +0.25}_{-0.24}$ &
$1.08\pm0.06$  & 1.00/196 & $7.33^{\rm +0.72}_{-0.74}$
\\
$1.75$$-$$3.0$ & $8.21^{\rm +1.66}_{-1.26}$ & $0.12^{\rm +0.25}_{-0.12}$ 
& $1.28\pm0.07$  & 0.86/189 & $7.89^{\rm +0.81}_{-1.01}$
\\
$3.0$$-$$6.0$ & $5.10^{\rm +5.68}_{-2.22}$  & 0.12(fixed) 
 & $0.73^{\rm +0.13}_{-0.10}$  & 0.51/59 & $3.34^{\rm +1.20}_{-1.96}$
\\
\hline
\end{tabular}
\end{table}