Fig. 3.

image

Spectral index from 145 MHz to 1.5 GHz (left panel) and error (right panel) maps of A520. In the both panels, the blue thick ellipse roughly follows the 3σ contour of the halo emission. The black thin ellipse shows the inner region of the halo. The black dashed regions are masked. The LOFAR contours begin with 3σ, where σ = 450 μJy beam−1, and are spaced with .

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