A 2D histogram between L and D, with N as the colour-coded number of counts. Dashed lines represent the fraction D/L with coefficients of 1, 0.9, 0.8, 0.7, 0.6 and 0.5 from top to bottom, respectively. The black line represents the median value of D at a given length L. On the sides are histograms of L and D. This is for all detected filaments across all regions, redshifts and simulations with L ≥ 2 Mpc. This is a distribution for AGN simulations, but the distribution for CSF is almost identical.