Correlation plot of the calibrated signal of α-Ophiuchi with the best binary fit solution: following the hint provided by the colinearity map of the calibrated data, the signal present in the data is fairly well reproduced by a binary companion located at angular separation ρ = 123.4 ± 1.7 mas, position angle θ = 86.5 ± 0.5 and contrast c = 25.1 ± 0.1. Residual structure in the data is accounted for by the introduction of an ad hoc amount of systematic error so that the reduced χ² = 1.