FITS Header

Primary Header

SIMPLE  =                    T /FITS format
BITPIX  =                   16 /Dummy primary header
NAXIS   =                    0 /No data is associated with this header
EXTEND  =                    T /Extensions may (will!) be present
RESOLUTN=                    9 /Resolution Index
PIXTYPE = 'HEALPIX '           /Pixel algorigthm
ORDERING= 'NESTED  '           /Ordering scheme
NSIDE   =                  512 /Resolution Parameter
NPIX    =              3145728 /Number of pixels
FIRSTPIX=                    0 /First pixel (0 based)
LASTPIX =              3145727 /Last pixel (0 based)
TELESCOP= 'WMAP    '           /Wilkinson Microwave Anisotropy Probe
COMMENT This file contains WMAP Intensity and Polarization (I, Q, U, and S)
COMMENT Res 9 skymaps for the differencing assembly indicated by
COMMENT the DA keyword.
COMMENT Simulated data was used to construct these maps!
COMMENT The seventh year of data went into the map.
REFERENC= 'WMAP Explanatory Supplement:  http://lambda.gsfc.nasa.gov/' /
STOKES  = 'IQUS    '           /
DA      = 'Q1      '           /WMAP Differencing Assembly
FREQ    = 'Q band  '           /Frequency band
RELEASE = 'DR4     '           /WMAP Release
DATE    = '2010-04-13T14:16:52' /file creation date (YYYY-MM-DDThh:mm:ss UT)
END

Stokes Maps

XTENSION= 'BINTABLE'           /binary table extension
BITPIX  =                    8 /8-bit bytes
NAXIS   =                    2 /2-dimensional binary table
NAXIS1  =                   20 /width of table in bytes
NAXIS2  =              3145728 /number of rows in table
PCOUNT  =                    0 /size of special data area
GCOUNT  =                    1 /one data group (required keyword)
TFIELDS =                    5 /number of fields in each row
TTYPE1  = 'TEMPERATURE '       /
TFORM1  = 'E       '           /
TUNIT1  = 'mK,thermodynamic'   /
TTYPE2  = 'Q_POLARISATION '    /
TFORM2  = 'E       '           /
TUNIT2  = 'mK,thermodynamic'   /
TTYPE3  = 'U_POLARISATION '    /
TFORM3  = 'E       '           /
TUNIT3  = 'mK,thermodynamic'   /
TTYPE4  = 'SPUR_SIGNAL '       /
TFORM4  = 'E       '           /
TUNIT4  = 'mK,thermodynamic'   /
TTYPE5  = 'N_OBS   '           /
TFORM5  = 'E       '           /
TUNIT5  = 'counts  '           /
EXTNAME = 'Stokes Maps'        /
DATE    =                    0 /
PIXTYPE = 'HEALPIX '           /
ORDERING= 'NESTED  '           /
NSIDE   =                  512 /
FIRSTPIX=                    0 /
LASTPIX =              3145727 /
END

Weight Arrays

XTENSION= 'BINTABLE'           /binary table extension
BITPIX  =                    8 /8-bit bytes
NAXIS   =                    2 /2-dimensional binary table
NAXIS1  =                   28 /width of table in bytes
NAXIS2  =              3145728 /number of rows in table
PCOUNT  =                    0 /size of special data area
GCOUNT  =                    1 /one data group (required keyword)
TFIELDS =                    7 /number of fields in each row
TTYPE1  = 'N_OBS   '           /
TFORM1  = 'E       '           /
TTYPE2  = 'M11     '           /
TFORM2  = 'E       '           /
TUNIT2  = 'counts  '           /
TTYPE3  = 'M12     '           /
TFORM3  = 'E       '           /
TUNIT3  = 'counts  '           /
TTYPE4  = 'M13     '           /
TFORM4  = 'E       '           /
TUNIT4  = 'counts  '           /
TTYPE5  = 'M23     '           /
TFORM5  = 'E       '           /
TUNIT5  = 'counts  '           /
TTYPE6  = 'M22     '           /
TFORM6  = 'E       '           /
TUNIT6  = 'counts  '           /
TTYPE7  = 'M33     '           /
TFORM7  = 'E       '           /
TUNIT7  = 'counts  '           /
EXTNAME = 'Weight Arrays'      /
DATE    =                    0 /
PIXTYPE = 'HEALPIX '           /
ORDERING= 'NESTED  '           /
NSIDE   =                  512 /
FIRSTPIX=                    0 /
LASTPIX =              3145727 /
COMMENT Weight arrays must be divided by a scaling factor sigma_0^2
COMMENT to provide a weight array in physical units (mK^-2).  See WMAP
COMMENT Explanatory Supplement.
END