Fig. C.2
Using the precession model, we calcuated χ2(ΔW,ΔN). The contour levels 68, 71, 76, etc correspond to 1σ, 2σ, 3σ, etc. Non-zero offsets are possible and the smallest offsets are ΔW ≈ 0.320 mas and ΔN ≈ 0.280 mas, which corresponds to a BBH system of radius Rbin ≥ 425 μas.
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