One-dimensional spatial profiles of stacks performed on simulations generated using various CO (left) and Lyα (right) models. For each profile, we plot the stack on the full simulated map (the orange lines) as well as a stack performed on a simulated map that contains only the DM halos included in the galaxy catalogue being stacked on (so there is no contribution at all from neighbouring halos; the indigo lines). We also plot a two-Gaussian fit (black lines) as well as the two Gaussian components individually (grey dotted lines).