Color histogram for the third nearest (left-hand panel) and third most distant (right-hand panel) clusters. The black (red) histogram is the color distribution in the cluster (control field) line of sight. The vertical red line indicates the expected color of an old passively evolving population, whereas the dashed lines mark the color range where red galaxies are counted. Error bars are -based for illustration only. Error bars of the control field color distribution are omitted to avoid crowding, and are negligible with respect to the cluster color distribution.
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