Isocontours of the 2D probability histograms of N_H and N(CH⁺) predicted by simulations with a resolution R = 64³ (green curve), 256³ (blue curve), and 512³ (pink curve), after application of the chemical solver and the lines of sight reconstruction algorithm. This representation shows, in a simplified manner, the effect of the resolution on the result displayed in Fig. 5. The isocontours chosen at 8 × 10⁻⁵ (top panel) and 8 × 10⁻⁴ (bottom panel) highlight the changes in the distribution of the most probable lines of sight. These values correspond to the turquoise blue and orange levels of the 2D probability histograms of N_H and N(CH⁺) (see Fig. 5).