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Proportion of GM pollen in the neighbouring conventional field, 
, as a function of the isolation distance, l*. The classical model relying on the Brownian motion assumption (α = 2) predicts isolation distances of 13 m and 27 m to keep outcrossing below the 0.9% and 0.1% thresholds, respectively. The model relying on the LF assumption (α = 1) predicts larger isolation distances of 72 m and 164 m to keep GM outcrossing below the same thresholds. (Online version in colour.)
