Maps of infall index ξ computed from the 3D model. Upper frames show the peak density along each LOS (frame a) and the distance (relative to the cloud centre) to that location along the LOS (frame b). The lower frames show the ξ maps for density thresholds n₀ = 10⁴ cm⁻³ and n₀ = 10⁶ cm⁻³. The dark green colour corresponds to masked areas where the maximum density along the LOS falls below the density threshold n₀.