Fig. 1
Top: greyscale mosaic of the area of XXL-N field observed with the VLA at 3 GHz with rms contours overlaid (contour levels are 10, 20, 30 and 40 μJy beam-1). Bottom: three examples of single- and multicomponent sources represented as greyscale maps with contours overlaid. The contour levels are 2iσ (i = 2,3, and 4, 1σ = 11μJy beam-1).
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