Overdensity parameter δ_g vs. radius r measured from the central SMG. Open dots represent when the only source measured within that radius is the target SMG, and black dots represent when at least one more source than the central SMG is observed. Error bars represent Poissonian errors. The dot is enclosed in a square when Poisson probability is p ≤ 0.05. The name of each SMG is indicated in the legend and the number of sources found within a radius r is indicated next to each point. A horizontal line represents δ_g = 0.