Maps of J1746+6226 (calibrator of HD 160934) in the three epochs. In each map, the lowest contour levels correspond to 4 times the statistical rms noise (0.5, 0.2, and 0.2 mJy beam^-1) with a scale factor between contiguous contours of . The peak flux densities in the images are 0.32, 0.32, and 0.34  mJy beam^-1, respectively. The different morphology in epoch 2012.830 is due to the larger rms.