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The sensitivity of optimal integrated observables to electroweak triple gaugecouplings is investigated for the process e-e+ -> W-W+ -> 4 fermions at futurelinear colliders. By a suitable reparameterisation of the couplings we achievethat all 28 coupling parameters have uncorrelated statistical errors and arenaturally normalised for this process. Discrete symmetry properties simplifythe analysis and allow checks on the stability of numerical results. Weinvestigate the sensitivity to the couplings of the normalised eventdistribution and the additional constraints that can be obtained from the totalrate. Particular emphasis is put on the gain in sensitivity one can achievewith longitudinal beam polarisation. We also point out questions that may bestbe settled with transversely polarised beams. In particular we find that withpurely longitudinal polarisation one linear combination of coupling parametersis hardly measurable by means of the normalised event distribution.

Triple gauge couplings in polarised $e^-e^+ \rightarrow W^-W^+$ and their measurement using optimal observables