Two-dimensional tracks of SSP detected in 3C 273 at the scale 2 of SWD for the epochs between 11/2003 and 12/2006. The tracks correspond to the features plotted in Fig. 11. The colors of the displacement vectors indicate the measurement epoch as shown in the wedge at the top of the plot. The plot confirms the significant transverse structure in the jet, with up to three distinct flow lines showing strong and correlated evolution. The apparent inward motion detected in a nuclear region (0–0.3 mas) is most likely an artifact of a flare in the jet core.
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