\begin{table}%t6
\caption{Single-temperature APEC model parameters fit to the PIN data in
  the 12--60~keV band. The systematic error in the NXB model is
  included in the error estimate.}\label{tab6}
%\centerline
 {\small \begin{tabular}{llllll}
\hline\hline \noalign{\smallskip}
Sensor & $kT$~[keV] & $Z$~[solar] & $K$ & $\chi^2/{\rm d.o.f.}$ & NXB$^{a}$ \\
  \hline
PIN & 20.2 (12.2 -- 41.6) & 0.33(Fix) & 1.02(0.59--$1.97)\times10^{-2}$ & 6.7/8 & $1.00$\\ 
PIN & 11.5 & 0.33(Fix) & $0.76 \times10^{-2}$ & 26.2/8 & $1.03$  \\ 
PIN & 27.9   & 0.33(Fix) & $1.28 \times10^{-2}$ & 6.9/8 & $0.97$ \\
\hline
\end{tabular}}
\smallskip
$^{a}$ The NXB normalization factor.
\end{table}