Figure 3: The LDN1622 region, as seen by WMAP in Stokes parameters (left), (centre), and (right column), at 23 GHz (top row) and 33 GHz (bottom row). All maps are displayed at the common angular resolution of . The circles ( , , and ) indicate the main aperture ( ) and the region for the background correction ( ) used for the aperture photometry method. The masked regions are not included in the flux density determination (see text for details).