Constraints on the primordial correlation fraction, cosΔ, in the mixed ADI+CDI model with Planck TT+lowP data (dashed black curve) compared to the case where Planck lowP data are not used, but replaced by a Gaussian prior τ = 0.078 ± 0.019 (dashed red curve). The same exercise is repeated with Planck TT, TE, EE data (solid curves) demonstrating that to a great extent the preferred value of cosΔ is driven by the high-ℓ data.
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