\begin{table}%T3
\caption{Spectral approximation of data collected at $|b|>2^\circ$.}
\label{spectral_params}
%\centerline
{
\begin{tabular}{l|c|c}\hline\hline
&Epoch4 & Epoch5\\
\hline
Photon index, $\alpha$&$2.14\pm0.02$&$2.15\pm0.02$\\
Line energy, keV&$6.71\pm0.03$&$6.65\pm0.05$\\
Line width, keV&$<$0.32&$<$0.39\\
Line $EW^a$, eV&$882\pm60$&$810\pm70$\\
$\chi^2$/d.o.f.&33/45&51/45\\
\hline
\end{tabular}}
\par
\medskip
$^a$ Equivalent width of the line.
\end{table}