Comparison of 2015 and 2018 polarization frequency maps. From left to right columns: (1) 2018 Stokes Q maps; (2) 2018 Stokes U maps; (3) Stokes Q difference map between 2018 and 2015; and (4) Stokes U difference map between 2018 and 2015. Note the different temperature scales. Rows indicated results for each of the seven polarized Planck frequency channels. All maps are smoothed to a common resolution of 1° FWHM.
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