Leiden/Argentine/Bonn (LAB) Galactic HI Survey
FITS Header Information

The maps are contained in a binary table containing TEMPERATURE, Q_POLARISATION, U_POLARISATION and N_OBS columns. A second table is supplied that contains the noise covariance matrices of the polarization maps.

Primary Header

SIMPLE  =                    T / file does conform to FITS standard
BITPIX  =                   32 / number of bits per data pixel
NAXIS   =                    0 / number of data axes
EXTEND  =                    T / FITS dataset may contain extensions
COMMENT   FITS (Flexible Image Transport System) format is defined in 'Astronomy
COMMENT   and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H
DATE    = '2007-05-24T22:20:12' / file creation date (YYYY-MM-DDThh:mm:ss UT)
END

Temperature and Polarization Maps Table

XTENSION= 'BINTABLE'           / binary table extension
BITPIX  =                    8 / 8-bit bytes
NAXIS   =                    2 / 2-dimensional binary table
NAXIS1  =                 8192 / 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
TTYPE2  = 'simulation'         / label for field   2
TFORM2  = '1024E   '           / data format of field: 4-byte REAL
COMMENT -----------------------------------------------
COMMENT Sky Map Pixelisation Specific Keywords
COMMENT -----------------------------------------------
PIXTYPE = 'HEALPIX '           / HEALPIX Pixelisation
ORDERING= 'RING    '           / Pixel ordering scheme, either RING or NESTED
NSIDE   =                  512 / Resolution parameter for HEALPIX
FIRSTPIX=                    0 / First pixel # (0 based)
LASTPIX =              3145727 / Last pixel # (0 based)
COMMENT
COMMENT -----------------------------------------------
COMMENT Data Description Specific Keywords
COMMENT -----------------------------------------------
INDXSCHM= 'IMPLICIT'           / Indexing : IMPLICIT or EXPLICIT
GRAIN   =                    0 / Grain of pixel indexing
COMMENT GRAIN=0 : no indexing of pixel data                         (IMPLICIT)
COMMENT GRAIN=1 : 1 pixel index -> 1 pixel data                     (EXPLICIT)
COMMENT GRAIN>1 : 1 pixel index -> data of GRAIN consecutive pixels (EXPLICIT)
COMMENT
TTYPE1  = 'TEMPERATURE'        / Temperature map
TFORM1  = '1024E   '           / data format of field: 4-byte REAL
COMMENT
END

More information concerning the contents of this file is available.