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Fig. B.1.


Images by VLBI of the inner 160 mas × 160 mas around the centre of the expansion ellipse. The ellipse and its centre are indicated by the dotted line and the white central dot, respectively. The position of V407 Cyg in Gaia DR2, brought back to t = 0 by application of proper motions, is also shown with a white cross (whose size represents the associated statistical uncertainty); the white dot indicates the position of the assumed centre of expansion. Beam sizes are shown by the filled ellipses in the bottom right corners. Noise levels are given in Tables 1 (EVN data) and 2 (VLBA data). The colour scale ranges from the 3σ noise level to the maximum intensity of each panel.

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