Planck 2018 results
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Fig. 25.

image

Marginalized 68% and 95% parameter constraint contours when adding AL as a single-parameter extension to the base-ΛCDM model, with (red) and without (blue) small-scale polarization, compared to the constraints in the base-ΛCDM model (grey). The dashed contours show equivalent results for Planck TT,TE,EE+lowE when using the CamSpec likelihood, which gives results with AL nearer unity and with slightly larger errors. The second row of subplots show, on the left axis, the predicted lensing deflection angle variance (from lensing multipoles 2 ≤ L ≤ 2000), which is a measure of the amount of actual lensing: the TT,TE,EE+lowE likelihood prefers about 10% more actual lensing power (associated with lensing smoothing), but in the (unphysical) varying-AL case this can be achieved using cosmological parameters that predict less lensing than in ΛCDM but substantially larger AL, giving a preference for AL ≈ 1.2.

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