Rest-frame colour–magnitude relation for galaxies in the field of view of our GMOS image, taken from the SDSS photometric catalog. Small circles correspond to galaxies with zphot> 0.4, assuming they are at the same redshift as the group (z ~ 0.6). Filled circles are the members of the new group found in this work at z = 0.6010. The red and blue lines correspond to the red and blue sequence, respectively.
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