Table 6: The angular separations of the core and component d relative to the jet apex.
  2001.20 2001.48 2001.86 2002.11 2002.14 2002.45 Average
$\triangle r_{\rm mas}$ 0.23 $\pm$ 0.032 0.21 $\pm$ 0.036 0.21 $\pm$ 0.028 0.36 $\pm$ 0.028 0.37 $\pm$ 0.032 0.24 $\pm$ 0.036 0.27 $\pm$ 0.032
$r_{a,\rm proj}^{2.3}$ 0.32 $\pm$ 0.044 0.29 $\pm$ 0.050 0.29 $\pm$ 0.038 0.50 $\pm$ 0.038 0.51 $\pm$ 0.044 0.33 $\pm$ 0.050 0.37 $\pm$ 0.044
$r_{a,\rm proj}^{8.4}$ 0.087 $\pm$ 0.012 0.079 $\pm$ 0.014 0.079 $\pm$ 0.010 0.14 $\pm$ 0.010 0.14 $\pm$ 0.012 0.090 $\pm$ 0.014 0.10 $\pm$ 0.012
Ra 2.31 $\pm$ 0.016 2.36 $\pm$ 0.024 2.29 $\pm$ 0.022 2.30 $\pm$ 0.022 2.30 $\pm$ 0.016 2.31 $\pm$ 0.024 2.31 $\pm$ 0.021
Notes: $\triangle r_{\rm mas}$ is defined to be the positional offset of the core relative to the jet apex, and is equivalent to the observed positional difference of component d at 2.3 and 8.4 GHz, $r_{a,\rm proj}^{2.3}$ and $r_{a,\rm proj}^{8.4}$ are the estimated separation (from Eq. (1)) of the core from the jet apex at 2.3 GHz and 8.4 GHz, respectively, and Ra (from Eq. (2)) is the estimated separation of component d from the jet apex, which is independent of frequency.

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