\begin{table}%tB.1
  \caption{Best fit results for the analysis of blank field observations in the
  10$^\prime$$-$12$^\prime$~ring.}
  \label{tab: bf results}
  \small%\centerline
 {
  \begin{tabular}{ccccc}
    \hline \hline
    Instr. & Filter & $N_{\rm HALO}$ & $N_{\rm QSP}$ & $N_{\rm CXB}^{a}$ \\
     & & [$10^{-4}$] & [$10^{-3}$] & [$10^{-2}$] \\
    \hline
    MOS1 & THIN1  & 1.7 $\pm$ 0.1 & 2.4 $\pm$ 0.1 & 5.1 $\pm$ 0.1 \\
    MOS2 & THIN1  & 1.6 $\pm$ 0.1 & 2.5 $\pm$ 0.1 & 5.0 $\pm$ 0.1 \\
    \hline
    MOS1 & MEDIUM & 1.4 $\pm$ 0.1 & 2.6 $\pm$ 0.1 & 6.0 $\pm$ 0.1 \\
    MOS2 & MEDIUM & 1.6 $\pm$ 0.1 & 2.4 $\pm$ 0.1 & 5.8 $\pm$ 0.1 \\
    \hline
  \end{tabular}}
  \medskip
  Notes. ${^a}$ calculated at 3~keV.
\end{table}