Sky-coverage of single-survey temperature maps for 30, 44, and 70 GHz. Left: 30 GHz. Middle: 44 GHz. Right: 70 GHz. From top to bottom, Surveys 1 to 8. The region of the Galactic mask is shown in blue. The combination of red and purple regions is used for destriping. The small red patches, visible especially at 44 GHz, indicate pixels from which there is not enough coverage to solve the Stokes components, but which can still be used for the destriping solution. The combination on purple and blue regions is included in the final map. Unobserved regions are shown in white. The intensity of a pixel encodes Stokes I.