Fig. 1.
a: Effelsberg map of the total intensity distribution of NGC 891 at 4.85 GHz (FWHM of the synthesised beam: 147″, rms noise: σ = 325 μJy beam−1). b: Effelsberg map of the total intensity distribution of NGC 4565 at 8.35 GHz (FWHM of the synthesised beam: 
, rms noise: σ = 260 μJy beam−1). Contour levels in both maps are σ × (3, 6, 12, 24, etc). Filled black circles indicate the size of the synthesised beam.
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