Left: spectral index map of the inner lobes of 4C 35.06 using the archival VLA images listed in Table 1. Overlaid are VLA 4885 MHz contours (− 5,18,27,36,81)σ. Right: spectral index map of the extended emission of 4C 35.06 using the LOFAR and WSRT images from this work. Overlaid are 33 contour levels from the LOFAR map spanning the range (− 3,183)σ. The beam sizes are given in the lower left corners.
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