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Fig. 3.
Radio spectral index maps. Top panel: from the CHANG-ES data calculated between 1.5 and 6 GHz. Bottom panel: between the 144 MHz LOFAR and the 1.5 GHz VLA maps. Red contours show the surface brightness distribution of the 1.5 GHz map (top) and 144 MHz map (bottom) with the same contour levels as in Fig. 1.
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