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Fig. 1.
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Contour maps of the phase-reference calibrator J2040+4527 in the EVN epochs 2014.46, 2016.45, 2018.44, and 2020.82 from left to right, respectively. Contours are 4, 8, 16, and 32 times the 0.6 mJy beam−1. The restoring beam is overplotted on the bottom left corner of each panel (see Table 1).
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