Table 6: The number of background stars expected in our ADONIS and NACO fields of view, based on the background star study of Shatsky & Tokovinin (2002). Column 1 lists the four regions for which we study the background statistics. The targets with Galactic latitude $\vert b\vert\leq 5^\circ $ are included in the region GP. The other targets are grouped according to their membership of US, UCL, and LCC. For the 177 targets only observed with ADONIS and the 22 targets observed with NACO we list the expected number of background stars per field of view, and the number of targets observed in the four regions. In total we expect to find $70.75 \pm 4.90$ background stars in the ADONIS sample, and $18.96 \pm 3.96$ in the NACO sample.
      ADONIS     NACO
Region stars per field $N_{\rm fields}$ stars per field $N_{\rm fields}$
US $0.06\quad^{+0.06}_{-0.02}$ 51 $0.10\quad^{+0.11}_{-0.04}$ 9
UCL $0.27\quad^{+0.06}_{-0.02}$ 64 $0.47\quad^{+0.11}_{-0.10}$ 3
LCC $0.43 \pm 0.08$ 40 $0.73 \pm 0.14$ 5
GP $1.51 \pm 1.03$ 22 $2.59 \pm 1.76$ 5
Total   177   22


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