AMI maps of NGC 891 observed at a central frequency of 15.5 GHz with the Small Array (SA) at 142′′ × 121′′ resolution (left) and the Large Array (LA) at 36′′ × 24′′ resolution (right). For the SA image, contours are at 3, 5, 8, 16, 32, 64 × σ where σ = 1.5 mJy beam⁻¹ is the rms noise level. For the LA image, contours are at 3 (white), 5, 8, 12, 18, 36, 72, 108 × σ where σ = 0.11 mJy beam⁻¹ is the rms noise level. The colour scales are in units of Jy/beam. The sizes of the synthesized beams are shown by the filled ellipses in the bottom left corners.