Top: fractional differences between the lensing power spectrum band powers from the ϕTT reconstruction over the aggressive multipole range and the Planck 2018 best-fit cosmology using Planck TT,TE,EE+lowE+lensing (blue points). Bottom: temperature-only curl reconstruction band-power amplitudes. In both cases, the orange points show the same data with a coarser binning, where the construction of the binning function and mid-points follows the same procedure as the blue points (see Sect. 2.1). The curl bin at 264 ≤ L ≤ 901 deviates from zero with a formal significance of 4.3σ. This bin was chosen to maximize the deviation; after simple consideration of “look-elsewhere” effects as described in the text, we evaluate the PTE of that deviation to be 0.41% (or roughly 2.9 Gaussian σ), still suggestive of a problem in the curl reconstruction.
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