Fig. 2.
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Stacked VLBI images of 3C 452 at 4.9 (upper left), 8.4 (upper right), 15.4 (middle left), 23.6 (middle right), and 43.2 (bottom) GHz. The images were restored with circular beams of 1.48, 0.8, 0.45, 0.34, and 0.18 mas, respectively. The respective peak flux density and rms values are displayed at the top of each panel. The maps were produced using uniform weighting.
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