Enlargement of part of the Planck 2018 CMB polarization map. The coloured background shows the temperature anisotropy field smoothed to the same scale as the polarization field, enabling us to visualize the correlation between the two fields. Top map: 10° × 10° patch centred on the south ecliptic pole, smoothed with a 20′ FWHM Gaussian (the data are natively at 5′ resolution). Bottom panel: further expansion of a 2.5° ×2.5° region in the same direction.
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