Fig. 5
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Colour-coded spectral-index image between 144 MHz and 1.43 GHz. The contour levels show the flux-density distribution at 144 MHz with(−l, 1, 2, 4, 8, …) times 0.78 mJy beam−1.The joint beam (shown bottom left corner) used to restore both the LOFAR and VLA images is 1.52″ × 1.03″ with a position angle of −4.44°.
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