Convergence map (5 deg on a side) for fixed source redshift z_s = 1. In the left panel, we consider all the matter present along the line of sight from z = 0 to z = 1, while in the central and right panels, we remove the matter located in a redshift slice as indicated in the legend. The red and yellow squares highlight some particular high-density regions that disappear in the central and right panels when discarding the matter present in the considered redshift slices.