Computation of a radial profile of one filament. Left panel: black dots show the extremities of the segments of filament given by DisPerSE. The straight black line connecting these extremities constitutes the filament spine. The area within a physical distance up to 20 Mpc from the filament spine is shown in light and dark gray. This area was used to compute a radial profile of the filament, as shown in the right panel. The area within a physical distance of 10−20 Mpc from the filament spine is shown in dark gray. It is defined as a background region. The average signal in the background region is subtracted from the radial profile. White disks are masked regions that were excluded from our analysis.