Individual contribution of cells in the Δ_i − T_i plane for the reference momentum-driven wind model along three different LOS: left panel refers to the LOS with the lowest absorption. The optical depth along this LOS in our simulation is τ(0.5 keV) = 0.06. Central panel indicates the median LOS corresponding to the solid, black line in Fig. 2, the median optical depth is τ(0.5 keV) = 0.21. The right panel refers to the LOS defining the top envelope of simulated curves in Fig. 2. In this case the optical depth is τ(0.5 keV) = 0.88. The colour scale represents the value of τ_i computed at 0.5 keV. The LOS with the lower absorption lacks of cells with Δ_i> 100. Instead these cells dominate the X-ray optical depth in the median and top LOS, where most (~60%) of the absorption is provided by two systems with Δ_i> 300 and T_i> 10⁶ K (dark red points).