Fig. 4.

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A demonstration of the improved fidelity of diffuse emission in LoTSS-DR2 compared to LoTSS-DR1. The image on the left is the 20″ resolution LoTSS-DR1 image of a region where it is apparent that low level artificial halos are present in regions surrounding real diffuse emission (most prominent around the radio galaxy centred at 12h03m12s +51°48′46″). The image on the right shows the equivalent LoTSS-DR2 image of the region where the artificial halos are no longer present. Another clear difference that is apparent in these panels is the low level structures in the noise in the LoTSS-DR1 images that we have successfully removed from the LoTSS-DR2 images.
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