Spiderweb protocluster field at z ≈ 2.16. Blue circles display the full sample of candidate HAEs from Koyama et al. (2013) and Shimakawa et al. (2018b). Red circles show those HAEs with measured spectroscopic redshift (Shimakawa et al. 2018b; Pérez-Martínez et al. 2023). Orange crosses and contours respectively show the CO(1−0) emitters reported by Jin et al. (2021) and the limits of the COALAS ATCA footprint. Empty squares depict the subsample of SMGs reported by Dannerbauer et al. (2014) in this field. Black stars show the LAEs from Pentericci et al. (2000), while X-ray sources from Tozzi et al. (2022a) are shown by black crosses. The Spiderweb galaxy is marked with a yellow star. We display a bar with 1 Mpc physical scale at z = 2.16 in the lower-left corner of the diagram for reference.