Table 6: Number of single- and multiple-planet systems detected and measured by Gaia as a function of $\sigma _\psi $.

$\sigma _\psi $a ($\mu $as)		 $N_\star$b $N_{\rm d}$c $N_{\rm m}$d $N_{\rm d,~mult}$e $N_{\rm m,~mult}$f $N_{\rm copl}$g
8 500 000 8000 4000 1000 500 159
12 148 148 2370 1185 296 148 47
16 62 500 1000 500 125 62 19
24 18 519 296 148 37 18 5
40 4000 64 32 8 4 1
80 500 8 4 1 0 0
a Single-measurement precision.
b Number of stars within the useful distance, assumed to scale with the cube of the radius (in pc) of a sphere centered around the Sun.
c Number of single-planet systems detected.
d Number of single-planet systems whose astrometric orbits are measured to better than 15% accuracy.
e Number of multiple-planet systems detected.
f Number of multiple-planet systems with orbits measured to better than 15-20% accuracy.
g Number of multiple-planet systems for which successful coplanarity tests (with $i_{\rm rel}$ known to better than $10{\hbox {$^\circ $ }}$ accuracy) can be carried out.


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