Examples of 2D projected DM density fields. For each sub-box with a side of 3 cMpc/h, the red star and red circle correspond to the analysed central galaxy of mass M_* > 10⁸ M_⊙ and to the R₂₀₀ radius of its host FoF halo, respectively. The small white stars and white dots indicate other centrals and satellite galaxies located in the sub-box, respectively. The length of the orange line in the bottom left part of the panels corresponds to ten times the resolution scale of the grid chosen to project the DM density and extract the skeleton, i.e. ten times 20 ckpc/h.