Two-dimensional tracks of SSP detected in 3C 120 at scale 2 of SWD. The colored tracks correspond to the features plotted in Fig. 13 in the same color. The tracks are overplotted on a stacked-epoch image of the jet rotated by an angle of 0.4 radian. The plot confirms the significant and evolving transverse structure in the jet, with individual tracks underlying the long-term evolution of the flow, which becomes particularly prominent at core separations of ≳6 mas.
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