Wilkinson Microwave Anisotropy Probe
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Intensity and Polarization Exclusion Masks
HEALPix, nested, res 9 (Nside=512), res 10 (Nside=1024), res 4 (Nside=16)
A number of WMAP data analysis applications use pixel masks which exclude foreground-contaminated portions of the sky from the analysis. Diffuse emission is masked using a combination of cuts in the K band map and a model of thermal dust emission. Point sources are masked based on a combination of external catalog data and WMAP-detected sources. A source exclusion radius of 0.6 degree is used for the intensity masks and 1.0 degrees for the polarization masks.
Mask values for each map pixel are provided in the N_obs field of the data file (the 'Temperature' field is set to zero for all pixels). A mask value of zero means the pixel is rejected; a value of one means the pixel is accepted.