Panel a: VLA archival image obtained on August 27, 1990, at 3.6 cm with the C-array configuration. The values of the contour levels are drawn in the corresponding colour scales to the right. The full width at half power of the synthesized beam is shown in the bottom right. Panel b: Same as the top panel, after smoothing to the resolution of our new 3 cm image. Panel c: Same as the other panels, but for our new 3 cm image obtained on March 11, 2016, with the C-array configuration. The bipolar structure of the jet is shown, consisting of a central core associated with NIRS 3 and two main knots to theNE and SW.
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