Circular regions where injection spectral indices are extracted in RSE and RN. The diameter of the circular regions is 15 arcsec which is equal to the beam size. The LOFAR (solid) and uGMRT (dotted) contour levels are identical to those in Fig. 5. Here σLOFAR = 350 μJy beam−1 and σuGMRT = 75 μJy beam−1.
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