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Fig. 4


5 GHz EVN and MERLIN images of NGC 4418 with different relative weighting. In a) the weight of the EVN is increased by a factor of ten with respect to MERLIN. As expected, the features F and G are still prominent, but the features A, B, C, D, E, and H are weaker. In b) the weights of MERLIN data are increased by a factor of ten with respect to the EVN. F and G are now lost in the noise, but we still see A, B, C, D, E, and H. The noise rms increases to 95 μJy/beam for panel a) and 150 μJy/beam for b). For easy comparison the contours in panels a) and b) have been set to the same (−2,2,4,6,8,10,12,14,16) times 90 μJy as in Fig. 2.

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