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Fig. 2

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Low resolution radio images of massive galaxy cluster MACS J0717.5 + 3745 with contours starting at (− 3σ, 3σ) and scaling by a factor of 2 with coordinates in the map at BJ2000 for same sky area. Left to right: 0.074 GHz (VLSS survey; σ = 73 mJy/beam; resolution =80′′ × 80′′), 0.234 GHz (GMRT; σ = 5 mJy/beam; with resolution similar to WSRT), 0.325 GHz (WSRT/ WNESS survey, σ = 3 mJy/beam; resolution =54′′ × 84′′; Coordinates in the map at BJ1950), 0.612 GHz (GMRT, σ = 0.69 mJy/beam; with resolution similar to WSRT).

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