(a) VLBA images at 8.4 (top left), 15.3 (top right), and 22.2 GHz (bottom) from epoch 1. In each case the bottom contour is 0.1 mJy/beam increasing in factors of 2. The data have been weighted with Briggs’ weighting scheme (Briggs 1995) using a robustness parameter of 0. (b) VLBA images at 8.4 (top left), 15.3 (top right), and 22.2 GHz (bottom) from epoch 2. In each case the bottom contour is 0.1 mJy/beam increasing in factors of 2. The data have been weighted with Briggs’ weighting scheme (Briggs 1995) using a robustness parameter of 0. (c) VLBA images at 8.4 (top left), 15.3 (top right), and 22.2 GHz (bottom) from epoch 3. In each case the bottom contour is 0.1 mJy/beam increasing in factors of 2. The data have been weighted with Briggs’ weighting scheme (Briggs 1995) using a robustness parameter of 0. (d) VLBA images at 8.4 (top left), 15.3 (top right), and 22.2 GHz (bottom) from epoch 4. In each case the bottom contour is 0.1 mJy/beam increasing in factors of 2. The data have been weighted with Briggs’ weighting scheme (Briggs 1995) using a robustness parameter of 0.