b. The actual travel trajectory of the plume rather than the (theoretical) straight-line dispersion.This would reduce the straight-line distance of detection (Xmax).c. The persistence of the stability conditions.While unstable conditions could very well persist for the short travel distances, it would be an extreme case that a specific (long) release would travel for its whole release time and for more than 10 hours’travel time in a straight line with unchanging dispersion characteristics under nighttime conditions (E,F,G).