Fig. 3
From top to bottom: the left column shows a zoomed-in image around 3C197.1, 4C +46.17 and 6C B075752.1+501806 respectively which highlights their different spiky patterns due to non-isoplanaticity in the ionosphere. The right column shows the residual images after the sources have been peeled off. The images represent an average of the seven spectral bands of the 3C 196 data.
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