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Fig. 11.


Radio map produced at the end of the direction-dependent calibration process. The rms noise is between 1.3 and 1.5 mJy beam−1, depending on the image region, at a resolution of 18″ × 11″. Red lines show the separation between facets and the red dots indicate the flux-weighted mean location of the sources used as direction-dependent calibrators. If a border between two facets crosses a source (as it happened for the primary target), the facet edge is modified so that each source is fully enclosed within one single facet. This is shown in the smaller panel where colour-coded there are the effective masks used to identify facets. We note that the border that goes over the extended emission of the Toothbrush cluster is not straight, so that the cluster is fully included in the left region.

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