Fig. B.7
Calculation of χ2(ΔW,ΔN) using the BBH model. Contour levels are 162, 163, 166, 171, 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 the case when the offsets are ΔW2 ≈ −0.085 mas and ΔN2 ≈ +0.105 mas.
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