PDFs of the log B_10 Mpc field across all the simulated filaments in the B₀ = 0.1 nG model, for all the pairs in the mock sample (black line) and for the best subsample (red line). The dashed blue lines show the log B_10 Mpc distribution from all pairs weighted over the pixel emissivity. The filled hatched areas encompass the 10−90 percentile ranges. The vertical solid lines show the median of the distributions.