Polarized intensity and white noise levels of the WMAP K band (top), Planck 30 GHz band (middle), and synchrotron amplitude from the COSMOGLOBE Gibbs chain (bottom), all evaluated at 30 GHz with a resolution of 72′. All maps have been scaled to a common frequency of 30 GHz. The leftmost column is a 10° wide square centered on the low signal-to-noise region highlighted by a red square in the middle column’s panels. The middle column shows the polarized total amplitude, P. The rightmost column shows the rms noise for the K-band and 30 GHz frequency maps and the COSMOGLOBE DR1 synchrotron amplitude map.