Table 4: Proper motions$^\dagger $ in the S5 polar cap sample.
Source Comp. $\mu $ $\beta_{\rm app}$
  $\rm [{\mu}as/yr]$ $[v_{\rm app}/{\rm c} ]$
0016+731 UC $ 32 \pm 31$ $1.9 \pm 1.8$
0153+744 UA2 $71 \pm 6$ $4.7 \pm 0.4$
0454+844 UB $-100 \pm 3$ $-5.1 \pm 0.2$
  UC $-217 \pm 140$ $-11.0 \pm 7.4$
0716+714 UB $-105 \pm 100$ $-1.6 \pm 1.5$
0836+710 UA2 $-13 \pm 6$ $-0.8 \pm 0.4$
  UA3 $118 \pm 7$ $7.6 \pm 0.5$
  UB $110 \pm 16$ $7.1 \pm 1.0$
  UC $101 \pm 16$ $6.5 \pm 1.0$
1749+701 UB $141 \pm 25$ $5.1 \pm 0.9$
  UC2 $732 \pm 603$ $26.5 \pm 21.8$
  UD $161 \pm 19$ $5.8 \pm 0.7$
  UE2 $-150 \pm 62$ $-5.4 \pm 2.2$
1803+784 UB1 $17 \pm 16$ $0.6 \pm 0.5$
  UB2 $133 \pm 24$ $4.4 \pm 0.8$
2007+777 UA1 $52 \pm 48$ $1.0 \pm 1.0$
  UB1 $56 \pm 11$ $1.1 \pm 0.2$
  UC $-88 \pm 61$ $-1.8 \pm 1.2$
  UF $350 \pm 203$ $7.0 \pm 4.0$
$^\dagger $ Proper motions are listed for components observed at three or more epochs, whose least-squares fit showed a motion larger than 1$\sigma$, which is the quoted uncertainty. See details in the main text and Fig. 1.

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