Table 3: Proper motion results. For each model component, we give the number of data points for the fit of the trajectory (N), the mean position angle ( $\langle\Theta\rangle$), the mean angular speed $(\langle\dot{\Theta}\rangle)$, the mean proper motion ( $\langle\mu\rangle$, and its corresponding $\beta ^{\rm {obs}}_{\rm {app}}$ $\langle\mu\rangle$), as well as its radial ( $\langle\mu_{\rm{rad}}\rangle$) and normal component ( $\langle\mu_{\rm{norm}}\rangle$, and its corresponding $\beta ^{\rm {obs}}_{\rm {app\_norm}}$).

Comp.		 N $\langle\Theta\rangle$ $\langle\dot{\Theta}\rangle$ $\langle\mu\rangle$ $\beta ^{\rm {obs}}_{\rm {app}}$ $\langle\mu_{\rm{rad}}\rangle$ $\langle\mu_{\rm{norm}}\rangle$ $\beta ^{\rm {obs}}_{\rm {app\_norm}}$
    $^{\circ} \ \ \ $ $^{\circ} \ \ \ $/yr mas/yr c mas/yr mas/yr c

Q1		 33 139.5 $\pm$ 7.1 10.7 $\pm$ 0.7 0.047 $\pm$ 0.002 3.26 $\pm$ 0.14 0.026 $\pm$ 0.002 0.039 $\pm$ 0.003 2.71 $\pm$ 0.21
Q2 34 175.4 $\pm$ 1.3 5.8 $\pm$ 0.3 0.042 $\pm$ 0.001 2.85 $\pm$ 0.07 0.036 $\pm$ 0.001 0.020 $\pm$ 0.003 1.39 $\pm$ 0.21
Q3 16 153.8 $\pm$ 2.7 8.0 $\pm$ 0.5 0.034 $\pm$ 0.002 2.29 $\pm$ 0.14 0.018 $\pm$ 0.002 0.029 $\pm$ 0.002 2.01 $\pm$ 0.14


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