Spectroscopic redshift histogram for galaxies within 30 arcmin of the RXC J0034.6−0208 cluster position. The caption information is the same as for Fig. 8. The Gaussian fit of the low-redshift peak gives z = 0.056 ± 0.002, while the high-redshift structure peaks at z = 0.082 ± 0.001. The likelihood distributions are in green the eastern component, in purple the northwestern object, and in blue the southwestern structure.