\begin{table}%t1 
\caption{\label{tab1}The results from  fitting PCA/HEXTE data  with different models.}
\par
%\centerline
{\small
\begin{tabular}{ccccc}
\hline\hline
Model&Parameters (units)&\multicolumn{3}{c}{Time Interval}  \\
  & &II &III    &IV \\
  \hline
bbodyrad + & $kT_{\rm bb}$ (keV)          &$ 1.11_{\rm -0.22}^{+0.07}$  & $2.84_{\rm -2.84}^{+1.37}$     &$1.98_{\rm -0.08}^{+0.05}$  \\
           & $N_{\rm bb}$            &$38.29_{\rm -5.89}^{+41.76}$  &$ 0.44_{\rm -0.44}^{+1.70}$     &$ 4.97_{\rm -1.65}^{+1.50}$  \\
 cutoffpl   & $\Gamma $           &$1.30_{\rm -0.04}^{+0.04}$  &$1.45_{\rm -0.43}^{+0.22}$     &$1.89_{\rm -0.14}^{+0.02}$  \\
           &  $E_{\rm cut}$ (keV)         &$ 38.51_{\rm -1.90}^{+2.11}$  &$4.61_{\rm -1.41}^{+0.65}$    &$6.37_{\rm -0.68}^{+0.40}$ \\
           & $N_{\rm cutoffpl}$      &$ 0.40_{\rm -0.04}^{+0.04}$ &$4.65_{\rm -0.60}^{+0.80}$    &$4.23_{\rm -0.18}^{+0.13}$ \\
           &$\sigma_{\rm Fe}$ (keV)       &$0.6^{+0.3}_{\rm -0.2}$ & 0.7$\pm$0.2  &0.8$\pm$0.1 \\
           &$N_{\rm Fe}$             &9$^{+7}_{\rm -2}$  & 20$\pm$4  & 20$^{+2}_{\rm -3}$\\
           & $\chi^{2}_{\nu}$/d.o.f.&1.17/71 & 0.83/47   &1.10/47\\
           \hline
Model&Parameters (units)&\multicolumn{3}{c}{Time Interval }     \\
  & & &V    &VI \\
  \hline
bbodyrad +     	   &$kT_{\rm bb}$ (keV) && &$ 0.72_{\rm -0.06}^{+0.08}$ \\
	   &$N_{\rm bb}$&& &$77.32_{\rm -32.72}^{+52.12}$\\
 bkn           &$\Gamma_{1} $ &&$ 2.26_{\rm -0.01}^{+0.01}$  &$1.85_{\rm -0.02}^{+0.02}$ \\
	   &$E_{\rm bkn}$(keV)&&$12.15_{\rm -1.15}^{+1.27}$&$ 50.98_{\rm -7.43}^{+6.93}$  \\
           &$\Gamma_{2} $&&$2.14_{\rm -0.04}^{+0.03}$ &$2.70_{\rm -0.33}^{+0.46}$\\
           &$N_{\rm bkn}$ &&$ 0.82_{\rm -0.02}^{+0.02}$&$0.31_{\rm -0.01}^{+0.01}$\\
	   &$\sigma_{\rm Fe}$(keV)&& 0.8$\pm$0.1 &0.7$\pm$0.1\\
	   &$N_{\rm Fe}$ &&5.0$\pm$0.5 &5.0$\pm$0.6\\
	   & $\chi^{2}_{\nu}$/d.o.f.&&1.01/72&1.03/70\\
	   \hline
bbodyrad + &$kT_{\rm bb}$ (keV) &&&$ 0.66_{\rm -0.04}^{+0.04}$ \\
 	   &$N_{\rm bb}$ &&&$330.02_{\rm -70.52}^{+94.04}$\\
Comptt     &$kT_{\rm seed}$ (keV)&&&$1.13_{\rm -0.35}^{+0.11}$\\
	   &$kT_{\rm e}$ (keV)&&&$21.83_{\rm -4.14}^{+4.04}$\\
	&$\tau_{\rm T}$&&&$1.87_{\rm -0.23}^{+0.29}$\\
	&$N_{\rm comp}$&&&$0.007_{\rm -0.002}^{+0.001}$ \\
	&$\sigma_{\rm Fe}$(keV)&&&0.7$\pm$0.1\\
	&$N_{\rm Fe}$&&&5.0$\pm$0.5\\
	&$\chi^{2}_{\nu }$/d.o.f. &&&1.07/70 \\
	\hline
\end{tabular}}
\par
\medskip
Note: All the fits have the iron line fixed at 6.4~keV and absorption at $3.8\times 10^{22}$~atoms/cm$^2$. By putting the source at a distance of 5.4~kpc, the luminosities calculated at 3--30~keV are $19.7\times 10^{36}$~erg/s for time interval~II,  $24.9\times 10^{36}$~erg/s for time interval~III,  $17.6\times 10^{36}$~erg/s for time interval~IV, $5.7 \times10^{36}$~erg/s for time interval~V, $5.6\times10^{36}$~erg/s for time interval~VI.  $N_{\rm Fe}$ is the iron line normalization in units of 10$^{-3}$ ph cm$^{-2}$~s$^{-1}$. The other normalizations $N_{\rm cutoffpl}$ and $N_{\rm bkn}$  are in units of cm$^{-2}$~s$^{-1}$~keV$^{-1}$. $N_{\rm bb}$ is the black body normalization proportional to the surface area, defined as $R_{\rm km}^{2}/D_{10}^{2}$, where $R_{\rm km}$ is the surface radius in km and $D_{10}$ is the source distance in 10~kpc.
\end{table}