\begin{table}%t2
 %\centering
\par
 \caption{Fitting results of the ASCA GIS spectrum. Errors bars are~90\% 
 confidence level. The last column gives the~$\chi^{2}$ over the number of 
 degrees of freedom (d.o.f.).\label{tbl:fitting}}
 \begin{tabular}{c c c c}
     \hline\hline
   $N_{\rm H}$        & $kT$  & $Z/Z_{\odot}$ & $\chi^{2}$/d.o.f. \\
   $10^{20}$~cm$^{-2}$ & (keV) & & \\
     \hline
    6.76          & $4.3 \pm 0.4$ & $0.32 \pm 0.08$ & 130.0/173 \\
   $14.7 \pm 3.5$ & $3.6 \pm 0.4$ & $0.43 \pm 0.10$ & 122.4/172 \\
     \hline
 \end{tabular}
 \end{table}