Fig. 18.
History of τ determination from WMAP to Planck. With Planck T tag we refer to Planck low-ℓ and high-ℓ temperature likelihood, with Planck T-E, we refer to low-ℓ and high-ℓ temperature likelihood combined with high-ℓ TE and EE likelihood. WMAP 9-yr + Planck 353 refers to the WMAP 9-yr low-ℓ and high-ℓ likelihoods with the large-scale polarization data cleaned by Planck 353 GHz.
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