\begin{table}%tA.1
  \caption{Best fit parameters for the NXB broken power~law.
  $\Gamma_1$ and $\Gamma_2$ are the slopes below and above the break
  energy, $E_{\rm B}$.}
  \label{tab: NXB}
  %\centering
\small
  \begin{tabular}{cccc}
    \hline \hline
     & $\Gamma_1$ & $E_{\rm B}$ [keV] & $\Gamma_2$ \\
    \hline
    MOS1 & 0.22 & 7.0 & 0.05 \\
    MOS2 & 0.32 & 3.0 & 0.22 \\
    \hline
  \end{tabular}
\end{table}