White noise standard deviation maps for a single arbitrarily selected sample. Rows show, from top to bottom, the 30, 44 and 70 GHz frequency channels, while columns show, from left to right, the temperature and Stokes Q and U parameters. Note that the 70 GHz maps are scaled by a factor of 2, to account for the fact that this map is pixelized at N_side = 1024, while the two lower frequencies are pixelized at N_side = 512.