WMAP Foreground Reduced, Reduced Resolution, Single Year Q,U Maps Per Differencing Assembly
FITS Header Information

The maps are contained in a binary table Q_POLARISATION and U_POLARISATION columns. A second table supplies the noise covariance matrices of the polarization maps.

Primary Header

SIMPLE  =                    T /FITS format
BITPIX  =                    8 /Dummy primary header
NAXIS   =                    0 /No data is associated with this header
EXTEND  =                    T /Extensions may (will!) be present
RESOLUTN=                    4 /Resolution Index
PIXTYPE = 'HEALPIX '           /Pixel algorigthm
ORDERING= 'NESTED  '           /Ordering scheme
NSIDE   =                   16 /Resolution Parameter
NPIX    =                 3072 /Number of pixels
FIRSTPIX=                    0 /First pixel (0 based)
LASTPIX =                 3071 /Last pixel (0 based)
COMMENT This file contains WMAP Polarization (Q and U) Res 4)
COMMENT Foreground Reduced skymaps for the differencing assembly
COMMENT indicated by the DA keyword.
COMMENT The first year of data went into the map.
DATE    = '2009-12-28T23:19:43' /file creation date (YYYY-MM-DDThh:mm:ss UT)
TELESCOP= 'WMAP    '           /Wilkinson Microwave Anisotropy Probe
REFERENC= 'WMAP Explanatory Supplement:  http://lambda.gsfc.nasa.gov/' /
STOKES  = 'QU      '           /
DA      = 'Ka1     '           /WMAP Differencing Assembly
FREQ    = 'Ka band '           /Frequency band
RELEASE = 'DR4     '           /WMAP Release
END

Temperature and Polarization Map Table

XTENSION= 'BINTABLE'           /binary table extension
BITPIX  =                    8 /8-bit bytes
NAXIS   =                    2 /2-dimensional binary table
NAXIS1  =                    8 /width of table in bytes
NAXIS2  =                 3072 /number of rows in table
PCOUNT  =                    0 /size of special data area
GCOUNT  =                    1 /one data group (required keyword)
TFIELDS =                    2 /number of fields in each row
TTYPE1  = 'Q_POLARISATION '    /
TFORM1  = 'E       '           /
TUNIT1  = 'mK,thermodynamic'   /
TTYPE2  = 'U_POLARISATION '    /
TFORM2  = 'E       '           /
TUNIT2  = 'mK,thermodynamic'   /
EXTNAME = 'Stokes Maps'        /
DATE    =                    0 /
PIXTYPE = 'HEALPIX '           /
ORDERING= 'NESTED  '           /
NSIDE   =                   16 /
FIRSTPIX=                    0 /
LASTPIX =                 3071 /
END

More information concerning the contents of this file is available.