Four different zoomed-in outputs of the pipeline for NGC 1068 with the polarization map superimposed. The polarization vectors are only displayed for the selected cut of [S/N]_P ≥ 3 and [S/N]_I ≥ 30. This juxtaposition shows different smoothing methods, all maps are binned to 0.1″ pixels. Top-left: without smoothing. Top-right: simple Gaussian smoothing of FWHM of 0.2″. Bottom-left: Gaussian smoothing with FWHM of 0.2″ where pixels are weighted with their inverse squared error. Bottom-right: combination and weighted Gaussian smoothing where the different observation through a same polarizer filter are both averaged and smoothed at the same time for a better reduction.