Planck 2018 results
Open Access

Fig. 54.


Comparison of the uncertainties, i.e., the square root of the diagonals of the covariance matrices, of the Plik coadded power spectrum (calculated as described in Appendix C.4 of PPL15) and of the Plik_lite CMB bandpowers in TT. The plot shows the ratio between the Plik_lite and the Plik errors. As expected, the nuisance parameter marginalization (in particular over the point-source amplitudes), which is performed to produce the Plik_lite bandpowers, increases the errors on the CMB-only power spectrum by up to a factor of 2. We do not show the same results for EE and TE, since in those cases the errors are the same to within fractions of a percent.

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