O VII column densities (colour maps) above the approximate current and near-future X-ray detection limit of log N_O VII(cm⁻²) = 15 through slices of 20 Mpc depth along the x-axis (the top and middle rows and the bottom-left panel), and the combination of all slices as a projection through the whole EAGLE box (100 Mpc, bottom-right panel). The region covered by high LD Bisous filaments is indicated in white, while the grey area shows the region covered by the lower density filaments. The red square in the middle-right panel corresponds to the region in Fig. 7.