\begin{table}%t4
%\centering
\par
\caption{Two-temperature APEC model parameters fit to the XIS
 spectra in the 0.5--10~keV and 4.0--5.5~keV bands.}\label{tab4}
\small \begin{tabular}{llllll}
 \hline\hline \noalign{\smallskip}
Energy band & $i$ & $kT_i$~[keV] & $Z_i$~[solar] & $K_i$ & $\chi^2/{\rm d.o.f.}$ \\
 \hline\noalign{\smallskip}
0.5--10~keV & 1 & 9.7(8.6--10.4)  & 0.33(0.31--0.36) & $1.07(0.88$--$1.13)\times10^{-2}$ & 1295.0/1207 \\
& 2 & ${>}32.5$ & $=Z_1$  & $3.73(3.01$--$5.39)\times10^{-3}$ & \\
 \hline
4.0--5.5~keV& 1 & 9.8(3.6--11.6) & 0.35(0.28--0.52) & $9.2(2.9$--$14.1)\times10^{-3}$ & 185.2/159 \\
 & 2 & 34.4(${>}22.2$) & $=Z_1$ & $4.67(0.26-1.07)\times10^{-3}$ & \\
  \hline
\end{tabular}
\end{table}