Planck 2013 results
Free Access

Fig. 41


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- power spectrum amplitude at ≤ 49 (blue); and when replacing the low- 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- amplitude, Alow.

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