Open Access
Fig. 3.
NGC 4013 total intensity image of LOFAR data at 150 MHz. Contours start at the 3σ level with a σ of 94.3 μJy beam−1 and increase in powers of 2 (up to 32). The beam size is 6.0″ × 6.0″ and is shown in the bottom left corner of the image.
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