\begin{table}%t2
\caption{Spectral parameters inferred from fitting the Chandra ACIS-S data
obtained from \PSR\ and its associated extended feature.}\label{tab2}
\par
\small%\centerline
 {
\begin{tabular}{lcccccc}
\hline\hline
&&&&&& \\[-8pt]
Model$^{a}$ & $\chi^{2}_{\nu}$ & d.o.f. & $N_{\rm H}$ & $\Gamma^{b}$/$kT$ & Normalization at 1 keV$^{c}$ & Radius$^{d}$\\
      &                  &        & $10^{21}$ cm$^{-2}$ &   & photons keV$^{-1}$ cm$^{-2}$ s$^{-1}$  & m \\
 \hline
 \multicolumn{7}{c}{\PSR}\\
 PL    & 0.89 & 36 & $\rm 2.40^{+0.36}_{-0.34}$  &  $\rm 2.91^{+0.16}_{-0.13}$   & $8.12^{+1.04}_{-0.90}\times10^{-5}$   & -- \\
 \\
 BB    & 2.00  & 36  & $<$$0.04$  & $\rm 0.36^{+0.01}_{-0.01}$  & -- & $\rm 29^{+2}_{-2}$ \\
 \\
 PL+BB   & 0.93  & 34 & $\rm 1.40^{+1.09}_{-l.40}$  &  $\rm 2.48^{+0.52}_{-1.09}/0.29^{+0.05}_{-0.29}$  & $4.60^{+6.29}_{-3.42}\times10^{-5}$ & $\rm 25.81^{+18.34}_{-25.81}$ \\
 \\
 PL+BB   & 0.92  & 35 & $\rm 2.44^{+0.60}_{-0.39}$  &  $\rm 2.91^{+0.16}_{-0.16}/0.07^{+0.03}_{-0.07}$  & $8.17^{+1.09}_{-0.94}\times10^{-5}$ & $300$ \\
 \\
 PL+BB   & 0.90  & 35 & $\rm 2.72^{+1.06}_{-0.55}$  &  $\rm 2.97^{+0.27}_{-0.17}/0.05^{+0.01}_{-0.05}$  & $8.67^{+2.25}_{-1.22}\times10^{-5}$ & $10000$ \\
 \\
 BB+BB   & 0.91 & 34  & $<$$0.70$  &  $\rm 0.71^{+0.21}_{-0.13}/0.27^{+0.03}_{-0.05}$  & -- & $\rm 5.37^{+3.43}_{-2.30}/42.32^{+22.74}_{-4.47}$  \\
      \hline
      \multicolumn{7}{c}{Arc-like feature}\\
      PL    & 0.88  & 6  & $2.40$  &  $\rm 2.00^{+0.32}_{-0.30}$   & $3.63^{+0.78}_{-0.74}\times10^{-6}$ & --  \\
\hline
 \end{tabular}}
 \medskip
 $^{a}$   {\footnotesize PL = power-law; BB = blackbody};
 $^{b}$   {\footnotesize the entry in this column depends on the model in interest. It is 
 the temperature~$kT$ in keV or the photon index~$\Gamma$};
 $^{c}$   {\footnotesize the normalization constant for the power-law model.};
 $^{d}$   {\footnotesize the radius of the blackbody emitting area is 
 calculate for an assumed pulsar distance of 361~pc.}
  \end{table}