Fig. 4
SDSS colour image of the cluster 2XMMi J143742.9+340810 with 4 arcmin a side centred on the X-ray position, which is marked by the cross-hair. Two cluster galaxies (LRGs) with spectra are marked by red squares. The measured spectroscopic redshift for this system is 0.5446, which is computed as the weighted average, 
, of the spectroscopic redshifts of the two LRGs.
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