3D overdensity map of the Hyperion proto-supercluster, in comoving megaparsecs. Colours scale with log(σ_δ), exactly as in Fig. 1, from blue (2σ_δ) to the darkest red (∼8.3σ_δ, the highest measured value in our 3D cube). The x−, y− and z−axes span the ranges 149.6 ≤ RA ≤ 150.52, 1.74 ≤ Dec ≤ 2.73 and 2.35 ≤ z ≤ 2.55. The NE and SW components are indicated. We highlight the fact that this figure shows only the proto-supercluster, and omits other less extended and less dense density peaks which fall in the plotted volume (see discussion in Sect. 3.2.).