Short-spacing corrected total intensity images of NGC 891 at a resolution of 12″ FWHM. a: 1.5 GHz (rms noise: σ = 24 μJy beam⁻¹), b: 6 GHz (rms noise: σ = 5.9 μJy beam⁻¹). All individual VLA maps have been PB-corrected before short-spacing corrections were applied. Contour levels are σ × (3, 6, 12, 24, etc). The 3σ contours near the edges of the C-band map are due to the radially increasing noise levels after PB correction. Filled black circles indicate the size of the synthesised beam.