Half-mission lensing reconstructions tests for the gradient (ϕ; upper) and curl (Ω; lower). Blue points show reconstruction power spectra from SMICA half-mission difference maps, after multiplication by a factor of 20. The orange points show the auto-spectrum of the reconstruction built from HM1 and HM2 (with no noise mean field), and the green points the cross-spectrum of the reconstruction built from HM1 with that built from HM2 (with no noise contribution to the reconstruction noise N(0)). The black line in the upper plot shows the Planck TT,TE,EE+lowE+lensing best-fit spectrum.
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