Fig. 4.

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Top: Details of the core region in 3C 84 for six selected epochs. Bottom left: Angle of the jet launching direction as a function of time. The angle is measured east of north. The measured direction from each epoch is shown in blue and the average of a GP regression to the data in orange. The orange shading indicates the 1 sigma (dark shade) and 3 sigma (light shade) uncertainty from the GP regression. Bottom right: Average direction from the GP regression, plotted in angular coordinates for a more intuitive representation of the direction change. Red corresponds to earlier epochs and blue to later epochs.
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