Figure 3.
The 2 plots describe spatial influence. Panel a plots s g p against distance d g p from 0 to 20 metres for beta 0.08, 0.12, and 0.18. All 3 curves decrease from 1 at 0 metres. At 20 metres, beta 0.08 decreases to about 0.20, beta 0.12 to about 0.09, and beta 0.18 to about 0.03. Panel b shows a two-dimensional spatial field for beta 0.12, with delta x and delta y extending from about negative 10 to 10. The gate sits at 0, 0, where the field reaches 1. The field decreases in concentric bands with increasing distance from the gate, reaching about 0.1 near the outer boundary.Spatial decay modeling of gate congestion: (a) decay curves under different values of β and (b) two-dimensional spatial influence field of a boarding gate