Planck 2018 results
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Fig. 23.

image

Constraints on the value of the consistency parameter AL, as a single-parameter extension to the base-ΛCDM model, using various combinations of Planck data. When only power spectrum data are used, AL >  1 is favoured at about 3σ, but including the lensing reconstruction the result is consistent at 2σ with AL = 1. The dotted lines show equivalent results for the CamSpec likelihood, which peak slightly nearer to AL = 1, indicating some sensitivity of the AL results to choices made in constructing the high-multipole likelihoods.

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