Planck 2018 results
Open Access

Fig. 49.

image

Difference between the mean EE spectra of the 300 end-to-end simulations and the noise-free simulation; both share the same input CMB and foreground maps. The difference between the two spectra, shown in blue, is smoothed in Δ = 20 flat bins. The blue shaded area gives the variance between the 300 simulations. The green line is the beam-leakage correction model shown for scale; it is cancelled in the difference between the mean end-to-end simulation and the noise-free spectra. For scale as well, the grey line presents 5% of the input simulation power (e.g., CMB plus foreground from the Planck Sky Model). From top to bottom the panels are the 100 × 100,143 × 143, 100 × 143, and 217 × 217 spectra. Apart from the lowest bin ( = 20, which is not used for the likelihood analysis), the 100 × 143 spectra do not show any significant residual, while all of the others show signs of possible correlated noise. We do not show the other cross-spectra that behave similarly. In the auto-frequency spectra plot, we show (with a red line) the empirical end-to-end EE correlated noise model, produced by fitting smoothing splines to the blue lines, after removing strongly varying trends at low and high .

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