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{\bf Event selection and particle identification}  The event selection relies on the presence of an energetic isolated lepton and  two energetic b-quark jetsand one energetic isolated lepton  in the final state, accompanied by either two light-quark jets or an additional lepton. At $\sqrt{s} = 360$\,GeV, the lepton momentum can take values between 14 and 115\,GeV/$c$, a range in which an identification efficiency of 80\% can be conservatively assumed, with a negligible fake rate. Similarly, the b-quark jet energies can take values between 50 and 90\,GeV, for which b-tagging algorithms are very efficient and pure, especially with two b jets in the final state. A very conservative b-tagging efficiency of 60\% is assumed here. To emulate these efficiencies, all terms of Eq.~\ref{eq:optimal}, hence all covariance matrix elements, are multiplied by $0.6 \times 0.8 = 0.48$. {\bf Detector acceptance}