Fig. 1
Image of the compact source 3C66 A and the extended source 3C66 B after the initial direction-independent calibration (left panel) and after the direction-dependent facet calibration (right panel). Both images are smoothed to the same resolution of 14′′ and are displayed on the same colour scale. The strong artefacts around 3C66 A after the direction-independent calibration in the left map are caused by the calibration not being adequate for this direction. After calibrating specifically for this direction these artifacts are mostly gone.
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