Fig. 6.
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Spectral index map of the halo at 20″ resolution between 144 and 675 MHz (top). The halo spectral index varies on the scale of about 20 kpc. Contour levels are drawn at [1, 2, 4, 8, …] × 3.0 σrms and are from the LOFAR 144 MHz image. Corresponding spectral index uncertainty (bottom). The beam size is indicated in the bottom left corner of the image.
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