Fig. 3

With ℓ₁, ℓ₂, and ℓ₃, the proportional map lengths of the left, middle and right segments of a three-segment broken stick (ℓ₁ + ℓ₂ + ℓ₃ = 1), the figure shows the effect on the discrepancy ratio (Eq. 6) of changing ℓ₁ + ℓ₃, and of different ways of partitioning ℓ₁ + ℓ₃ between the outside segments. GPO relationship, map length 2 M. Lower curve: the effect of changing ℓ₁ + ℓ₃ while ℓ₁ = ℓ₃; upper curve, the same, but with no recombination in one of the two outside segments (say ℓ₃ = 0). At point A, all recombination is confined to the middle segment, with end segments either completely sharing or completely non-sharing. At point B, there is no recombination in the middle segment, with map length equally divided between the end segments. At point C, all recombination is confined to one of the end segments