Fig. 8
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Two point non-thermal radio spectral indices at low (θlow; 54–144 MHz) and high (θhigh; 1370–4850 MHz) frequencies. The top panels show the spectral indices θlow (left panel) and at θhigh (right panel). The bottom panels show the corresponding uncertainty maps. The black contours represent a total gas-mass surface density 25 M⊙ pc−2.
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