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Fig. 1.
Radio emission from the giant radio halo at the center of MACS J0018.5+1626 (CL0016+26), shown in contours, superposed on the X-ray image obtained by Chandra (colour). The HPBW is 40″, the noise level is 0.05 mJy per beam and the shown contour levels are 0.3, 0.5, 0.7, 1 mJy per beam.
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