Impact of corrections of systematic effects on cosmological parameters. The figure show 1-dimensional posterior distributions for the ΛCDM models. We show results for the baseline 2018 Planck TT,TE,EE+lowE(solid black line) likelihood (which includes the 2018 PlikTT,EE,TE and the 2018 lowlTT likelihoods), as well as the results obtained with the old 2015 TT, TE, EE (solid red line) likelihood (which includes the 2015 PlikTT,EE,TE the 2015 lowlTT likelihoods). In both cases we also used the 2018 lowE likelihood at large scales in polarization, in order to compare the 2015 versus 2018 results using the same constraint on the optical depth to reionization. All the other lines show the impact of neglecting various systematic effects, whose corrections have been introduced after the second, 2015, data release. In particular, we show the impact on the 2018 results of neglecting the beam leakage (dashed orange), the correlated noise and sub-pixel effects (dotted cyan), the PE corrections (dot-dashed pink), and all of the above (solid blue). Most of the changes in parameters between 2015 and 2018 can be attributed to these systematic effects (mostly the beam-leakage correction in TE). Other remaining modifications, such as those in the mapmaking or dust modelling, have a smaller impact.
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