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Fig. 3

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M 51 at a central frequency of 151 MHz with a bandwidth of 47.7 MHz overlayed onto an optical DSS image using a cubehelix colour scheme (Green 2011). The resolution is 20′′  and a robust weighting of −0.5 was used. Here the extended disk is seen clearly. The contours start at 1 mJy/beam and increase by a factor 1.5.

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