PPM plots (left) and density maps (right) of protoclusters detected around z > 4 SMGs using the AH18 (top), B19 (center), and L18 (bottom) catalogs. Left: PPM plots for HDF850.1, GN10, and GN20. The vertical solid lines show the SMG spectroscopic redshifts. Colored dots refer to significance levels > 2σ (cyan), 3σ (green), 4σ (blue), 5σ (red), 6σ (brown), and 7σ (black). Right: Gaussian density maps for the overdensities, centered at the projected space coordinates of the SMGs. The solid black and dashed red circles are centered at the projected space coordinates of the SMGs. The former have a (physical) radius of 1 Mpc, estimated at z_ov, while the latter, with a radius ℛ_PPM, denote the region within which the PPM detects the overdensity. The dotted-dashed green circle is centered at the peak of the detection as found by the wavelet transform and has a radius ℛ_w.