Density profiles around filaments in EAGLE and TNG100 at z = 0, in analogy to Fig. 9. Galaxy, DM, and gas profiles are shown in blue, orange, and purple, each normalised to their respective cosmic mean. Light and dark shades represent the first and fourth quartile in filament width; for clarity we omit the two middle quartiles. Profiles for EAGLE-Ref100 and TNG100 are shown as dashed and solid lines, respectively. The grey shaded area marks overdensities ≳10 that are dominated by galaxies within the filaments. The two simulations agree qualitatively for all six profiles shown, and even quantitative discrepancies are minor.