Fig. 3.

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Radio images of the source NGC 507 at 144 MHz (top row), 400 MHz (central row), and 675 MHz (bottom row). The left column shows images at high resolution and the right column at low resolution, as reported in Table 2. Contours are drawn at −3, 3, 5, 10, 25, and 40σ. The beam is shown in the bottom-left corner and a reference physical scale is shown in the top-left corner.
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