Area covered by Bisous filaments in EAGLE and SDSS. Upper-left panel: projection of the Bisous filaments (black) along the X-direction through the whole EAGLE simulation box (100 Mpc). Upper-right panel: same as on the left, but selecting only filaments within high LD regions. Lower-left panel: Bisous filaments in the SDSS main footprint (black) projected on the plane of sky in the radial range z = 0.02 − 0.05, or ≈85−215 Mpc from Tempel et al. (2014). Lower-right panel: same as on the left, but selecting only filaments within high LD regions.