Impact of different choices for the PE corrections on 1-dimensional posterior distributions of cosmological parameters and PE amplitudes from Planck TT,TE,EE+lowE. The red lines show results when leaving the PE parameters free to vary independently for EE and TE, while the grey lines assume coupled parameters for the EE and TE spectra. The green lines show results obtained when fixing the polarization efficiencies in the spectrum-based approach to the values indicated by the vertical green dotted-dashed lines. Finally the black lines show results obtained when fixing the polar efficiencies in the map-based, baseline case, to the values indicated by the vertical black dashed lines. The solid lines show results for the ΛCDM case, while the dotted ones show results for the ΛCDM+A_L model. This plot shows that the recovered values for PE change according to the cosmological model.