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Fig. 2.


Panel a: core distances of the jet features that could be traced through the epochs in the one-jet scenario. The proper motions were determined via linear regression (dashed lines), for feature 1h a quadratic fit is shown. For jet components 1c and 1h some components are crossed by an orange line; these lines mark those epochs where the component motion seems to be along a curve. The colored rings refer to the component’s maximum flux-density (see panel d). Panel b: component paths in x and y for those features shown in panel a. Again, the orange lines mark the epochs where motion along a curve (or strongly bent structure) seems to be observed. The black arrows indicate the direction of motion in the case of the one-jet scenario. Panel c: paths of the three innermost components that could be traced in panels a and b. Panel d: flux-density evolution of the jet components 1b–1h as a function of time. The colored circles indicate the times of their maxima. The same circles and colors are used in panels a and b.

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