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Fig. 1
SDSS image of the cluster 2XMMi J143742.9+340810 at a redshift of 0.5446, with X-ray surface brightness contours (0.2−4.5 keV) overlaid in yellow. The plotted cyan circle has a radius of one arcmin around the X-ray position. The field of view is 4′ × 4′ centred on the X-ray emission peak.
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