WHIM hydrogen column density distributions (black crosses) resulting from the LD–WHIM density scatter in the simulations (C12) for the SW (left panel) and PC (right panel) structures. The best-fit log-normal models (red lines) in the fitted range (solid line) are shown together with the extrapolation (dotted line). The best value and the 1σ confidence intervals are indicated with dashed green lines and the blue shaded regions, respectively.