Fig. 2.
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Spectral index maps for 3C 457, 3C 465, and 3C 442A at 25″ × 25″. The colour scale is set between 0.5 and 1.7 for every image. The contours are drawn at [3, 5, 10, 50, 100, 200]×σrms of the LBA image. Every map shows spectral index values with a threshold of 2σrms. Finally, the beam for that map and the physical scale of the source are also indicated.
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