Fig. 4.
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Observed data with error bars and best fit (solid line) of the τ statistics at the 68% confidence level (dashed lines) for the three different methods used to estimate the covariance matrix of the τ statistics. The τ statistics were estimated using parameters (α, β, η) sampled with least-squares. We note that τ2 and τ5 are multiplied by ϑ in the middle and right panels.
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