Spectroscopic redshift distribution of the galaxies targeted in our sample as a black histogram. The vertical black dashed lines delimit the redshift selection of the results presented in this paper. The red line shows our Gaussian fit to the distribution without using rejection algorithms, pinpointing z = 0.836 ± 0.008 as the core redshift of the densest structure we find. The peak at slightly higher redshift (z ∼ 0.88) is likely produced by members from the north-western cluster C (see Table 2 and Fig. 1).
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