Synthetic radio maps at 8.6 GHz for the same binary separation as in the epoch of the LBA observations (top), for roughly the present epoch (middle), and for roughly the periastron passage (bottom) for the model described in Sect. 3.2. In all images, the red contours are at 0.1 mJy beam^-1 and 0.3 mJy beam^-1. In the top image the black contours are 0.5 mJy beam^-1 and 1.0 mJy beam^-1, in the middle image they start at 0.5 mJy beam^-1 and increase in 2.0 mJy beam^-1, and in the bottom one, there is only one contour at 0.5 mJy beam^-1.