Imageof the full FoV of the LOFAR observations after initial calibration, with NGC 891 in the centre, 3C66 A/B above the centre, and 3C65 at the lower edge of the image. Overlaid is the faceting scheme that was used for the facet calibration: in orange the squares of the calibrator regions that were used to calibrate the facets and in green the resulting facets that are defined by Voronoi tessellation around the calibrators.