Posterior distributions for τ estimated from: the LFI baseline likelihood (τ = 0.063 ± 0.020); the WMAP data set smoothed with a cosine window, cleaned as given in Table 12, and masked with the analysis mask P06 (τ = 0.062 ± 0.012); and the difference between these two data sets, WMAP − LFI, to which we apply a mask given by the intersection of the R1.8x and P06 masks (τ ≤ 0.033 at 95% CL).
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