Table 10: An estimate of the number of 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 8), and the fraction of binaries with angular separation $1'' \leq \rho \leq 4''$ (assuming Öpik'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 Martín et al. (2004), assuming that 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 all free-floating brown dwarfs were formed as companions.
# $F_{1''-4''}~(\%)$ $F_{\rm IM}~(\%)$ $N_{\rm BD,IM,i}$ $N_{\rm BD,IM,i,total}$
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 $


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