Fig. 7.
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Spectral index maps of NGC 507 between 144 MHz and 400 MHz at a resolution of 7 arcsec (left) and 20 arcsec (right). Only pixels with surface brightness above 3σ in both images were used. Contours show the LOFAR emission at 144 MHz and are drawn at [−3, 3, 5, 10, 20, 40, 60, 90] × σ. Typical errors in the brightest pixels are equal to ∼0.1 and in the faintest pixels to 0.15–0.2.
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