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Fig. 4
LOFAR map of NGC 891 at a resolution of 40.0′′ × 35.7′′ shown by the filled ellipse in the bottom left, overlaid onto an optical image from the Digitized Sky Survey. Contours are at 3, 5, 8, 12, 18, 32, 44, 88, 164, 200 × σ where σ = 1.1 mJy beam−1 is the rms noise level.
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