LeoII-A filament in three-axes: right ascension (RA, in degrees), declination (Dec, in degrees), and line-of-sight distance (in megaparsecs). Filament-hosted galaxies and uniformly sampled gas particles (to simulate WHIM diffuse gas) are shown with dark and light blue points, respectively. The 3D fitted spine axis is shown with a green curve around which the gas particles are sampled. Distances of filament galaxies are derived from their heliocentric radial velocities (retrieved from HyperLEDA in Kim et al. 2016) based on the assumption of a linear Hubble distance – redshift relationship by applying a standard flat ΛCDM cosmology (Planck 2013 results in Planck Collaboration XVI 2014, Ω_m = 0.307, H₀ = 67.8 km s⁻¹ Mpc⁻¹).