\begin{table}%t10
  %\centering
\par
  \caption{An estimate of the number of {\em primordial} binaries in Sco~OB2 with A and late-B primaries and brown dwarf companions  (with $0.02$~$M_\odot \leq M \leq 0.08$~$M_\odot$) in the angular separation range $1'' \leq \rho \leq 4''$. Columns~1 and~2 list the model number (cf. Table~\ref{table: modelbackgroundstars}), and the fraction of binaries with angular separation $1'' \leq \rho \leq 4''$ (assuming \"{O}pik's law). Column~3 lists the fraction $F_{\rm IM}$ of primaries in the simulated association that is of type A or late-B. Column 4 shows the contribution of brown dwarf companions in Sco~OB2 with A and late-B primaries in the angular separation range $1'' \leq \rho \leq 4''$, inferred from the 28~free-floating brown dwarfs in Sco~OB2 found by \cite{martin2004}, assuming that {\em all} brown dwarfs were formed as companions. Column 5 shows the total number of primordial brown dwarf companions with $1'' \leq \rho \leq 4''$ and A or late-B primaries, with the observed brown dwarf companions (corrected for unseen brown dwarfs with $K>14$~mag) included. The values of $N_{\rm BD,IM,i,total}$ are upper limits, as it is likely that not {\em all} free-floating brown dwarfs were formed as companions. \label{table: martin}}
  \begin{tabular}{ccccc}
    \hline\hline
    \# & $F_{1''-4''}~(\%)$ & $F_{\rm IM}~(\%)$ & $N_{\rm BD,IM,i}$ & $N_{\rm BD,IM,i,total}$ \\
    \hline
    1  & 10.9 & 4.93  & $ 6.26  \pm 1.19  $  & $ 7.93 \pm 2.05 $\\
    2  & 10.9 & 5.34  & $ 6.78  \pm 1.29  $  & $ 8.45 \pm 2.11 $\\
    3  & 10.9 & 6.33  & $ 8.04  \pm 1.52  $  & $ 9.71 \pm 2.26 $\\
    4  & 10.9 & 0.40  & $ 0.51  \pm 0.10  $  & $ 2.18 \pm 1.67 $\\
    5  & 10.9 & 2.45  & $ 3.11  \pm 0.59  $  & $ 4.78 \pm 1.77 $\\
    6  & 10.9 & 2.70  & $ 3.43  \pm 0.65  $  & $ 5.10 \pm 1.79 $\\
    7  & 10.9 & 3.19  & $ 4.05  \pm 0.77  $  & $ 5.72 \pm 1.84 $\\
    8  & 10.9 & 0.20  & $ 0.25  \pm 0.05  $  & $ 1.92 \pm 1.67 $\\
    \hline
  \end{tabular}
  \end{table}