RA–Dec overdensity maps, in three redshift slices as indicated in the labels. The background grey-scale indicates the overdensity log(1 + δ_gal) value (darker grey is for higher values). Regions with log(1 + δ_gal) above 2, 3, 4, 5, 6, and 7 σ_δ above the mean are indicated with blue, cyan, green, yellow, orange, and red colours respectively. The red dotted line encloses the region retained for the analysis, and the blue dotted line is the region covered by the VUDS survey. The two black dashed ellipses (repeated in all panels for reference) show the rough positions of the two main components of the proto-supercluster identified in this work, dubbed “NE” (rightmost panel) and “SW” (leftmost panel). The field dimensions in RA and Dec correspond roughly to ∼120 × 130 cMpc in the redshift range spanned by the three redshift slices.