Median number density (no weighting applied) of the intergalactic oxygen (turquoise line) and O VII (dashed purple line) as a function of distance from nearest halo within Bisous filaments. The shaded regions indicate the 68% scatter in the density distribution from all the filaments combined. Within each distance bin, only particles not belonging to any FoF group were included. Haloes were selected within the mass range log M₂₀₀(M_⊙) = 12 − 13.5. The corresponding range of R₂₀₀ = 220 − 660 kpc is indicated on the upper axis. The horizontal dashed lines indicate the approximate detection limits with future X-ray detectors, with the lower and higher limits representing a filament parallel or perpendicular to the line of sight, respectively.