Fig. 4.
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Continuum mosaic obtained from one 11.5-h Apertif observation, centred on the Lockman Hole region. A number of extended sources are visible (including a giant radio galaxy at the top right). The noise level is about 35 μJy beam−1, except close to a few very bright sources, where calibration artefacts are still visible (see Sect. 12 for more details).
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