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Fig. 1


MERLIN-only continuum image of NGC 4418 at 5.0 GHz. Contour levels are (−2,2,4,6,8,10,12,14,16,18,20,22,24,26,28) times the noise root mean square (rms) σ = 300μJy/beam. We note that there are no negative features as strong as − 2σ, hence no dashed contours. The CLEAN restoring PSF of FWHM 105 mas×42 mas is plotted in the lower left inset. The labels A–H mark the positions of the compact features seen in Fig. 2. The label S (close to label C) corresponds to the 860 μm continuum peak position from Sakamoto et al. (2013).

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