\begin{table}%t2
  \caption{\label{spfits}\suz\  spectral fitting results.}
%\centering
\par
\begin{tabular}{lccccc} \hline\hline\noalign{\smallskip}
  Model      & $N_{\rm H}$     &  $kT$ or $\gamma$\tablefootmark{a} & $\chi^2$/d.o.f. \\
  & $10^{22}$ cm$^{-2}$ &  keV   &  \\ \hline
  \multicolumn{4}{c}{ { Core of the PWN\tablefootmark{b}}}  \\
  Power-law  & $1.57\pm 0.06$  &  $1.82\pm 0.04$ & 925/1145 \\
  \multicolumn{4}{c}{{ Shell\tablefootmark{c}}}  \\
  Power-law  & 1.57  &  $2.9\pm 0.3$ & 173/215    \\
  Thermal    & 1.57  &  $2.0\pm 0.4$  & 196/215     \\
\hline
\end{tabular}
\tablefoot{\tablefoottext{a}{the power-law photon index.}
\tablefoottext{b}{Unabsorbed flux in the \mbox{2--10}~keV band is $7.5\pm 0.5 \times 10^{-12}$~erg~cm$^{-2}$ s$^{-1}$.}
\tablefoottext{c}{Extraction region 91 arcmin$^2$. Unabsorbed flux in the 2--10~keV band is $4.7\pm 0.7 \times 10^{-12}$~erg~cm$^{-2}$~s$^{-1}$ without the contribution scattered from the core.}}\vspace*{-2mm}
\end{table}