Results of the line fitting process applied on the 161 MOS spectra. (Lower-left panel) The main plot of this figure shows the values of the MOS redshifts calculated using [O II] (yellow), Hβ (indigo), and [O III]λ5007 (magenta) emission lines with respect to Hα redshifts (from SP15 or Cedrés et al. 2024), in both cases with their respective uncertainties as error bars. The symbols of each emission line are shown in the upper-left region. The green circles show outliers, which are galaxies with MOS redshifts that are different from the Hα redshifts. We linearly fitted each distribution (shown with the coloured dashed lines), taking care to exclude outliers. The dashed black line represents the one-to-one relation. In the lower-right corner we show a zoomed window on the structure A. (Upper-left panel) The histogram shows the distribution of z_Hα with the position of each structure (A, B and C) at their corresponding redshift and the number of detections in the upper-right corner (including duplicated z_Hα for galaxies 647_b and 657_b that have two MOS spectra each). (Lower-right panel) The histograms show the three distributions of MOS redshifts ([O II] in yellow, Hβ in indigo, and [O III]λ5007 in magenta) with the number of detections at the top. (Upper-right panel) The scatter plot shows how distant are the MOS redshifts from the Hα distribution, using log₁₀(|z_MOS−z_Hα|)/(1 + z_Hα). These values were used to identify the outliers shown with green circles. We show in the lower-right corner the medians of the uncertainty bars of each distribution.