Top: projected redshift distribution of galaxies with spectroscopic redshift information for the RXC J0034.6−0208 observation. The caption information is the same as for Fig. 10, with the exception that light-blue circles correspond to galaxies with redshift values of ∼0.056 and pink squares show galaxies with ∼0.082. The filled triangles shows the X-ray peak positions of the three extended substructures in the field. Bottom: SDSS r -band image of the region delimited by the black solid line in the top panel.