Comparison of the posterior distributions for Ωch2, ns, and H0 for the default six-parameter ΛCDM model constrained by Planck (red); compared to the case when we allow a variable low-ℓ power spectrum amplitude at ℓ ≤ 49 (blue); and when replacing the low-ℓ temperature likelihood with a Gaussian prior on τ, the optical depth of reionisation (purple). The lower right panel shows the posterior distribution for the low-ℓ amplitude, Alow.
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