Fig. B.6
Calculation of χ2(ΔW,ΔN) using the BBH model. Contour levels are 246, 247, 250, 255, etc., corresponding to the minimum, 1σ, 2σ, 3σ, etc. There is a valley of possible offsets, but the size of the offset must be the same as the radius of the BBH system. This is true when the offsets are ΔW1 ≈ +0.490 mas and ΔN1 ≈ 0.005 mas.
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