FITS Headers
FIRAS_COVARIANCE_MATRIX_LOWF.FITS
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 defined in Astronomy and COMMENT Astrophysics Supplement Series v44/p363, v44/p371, v73/p359, v73/p365. COMMENT Contact the NASA Science Office of Standards and Technology for the COMMENT FITS Definition document #100 and other FITS information. DATE = '24/09/97' / FITS file creation date (dd/mm/yy) ORIGIN = 'CDAC ' / Cosmology Data Analysis Center TELESCOP= 'COBE ' / COsmic Background Explorer satellite INSTRUME= 'FIRAS ' / COBE instrument [DIRBE, DMR, FIRAS] OBJECT = 'ALL-SKY ' / part of sky given [ALL-SKY, GAL-SLICE] PRODUCT = 'COV-MAT ' / Covariance matrix EQUINOX = 2000.0 / equinox of coords in following tables COMMENT REFERENC= 'For additional information, please refer to the' / REFERENC= 'COBE Far Infrared Absolute Spectrophotometer (FIRAS)' / REFERENC= 'Explanatory Supplement, ed. J.C. Mather et al,' / REFERENC= 'COBE Ref. Pub. No. 97-C (Greenbelt, MD: NASA/GSFC),' / REFERENC= 'available in electronic form from the NSSDC.' / COMMENT COMMENT COBE specific keywords DATE-BEG= '24/11/89' / date of initial data represented (dd/mm/yy) DATE-END= '21/09/90' / date of final data represented (dd/mm/yy) PIXRESOL= 6 / Quad tree pixel resolution [6, 9] COMMENT COMMENT FIRAS specific keywords CHANSCAN= 'LOWF ' / Field indicating combination of data from COMMENT / various channels and mirror transport COMMENT / mechanism scan modes. LOWF is a combination COMMENT / of the low frequency RLSS, RLFS, RLFL, LLSS, COMMENT / LLFS, and LLFL data. HIGH is a combination o COMMENT f COMMENT / the high frequency RHSS, RHSF, RHLF, LHSS, COMMENT / LHSF, and LHLF data. HIF2, HIF3, and HIF4 COMMENT / divide the HIGH data into three frequency COMMENT / bands, as indicated by the NU_ZERO and COMMENT / NUM_FREQ fields. HRES is a combination of th COMMENT e COMMENT / high resolution RLLF and LLLF data. For the COMMENT / uncombined channel/scan mode labels, the firs COMMENT t COMMENT / two characters of the label indicate the COMMENT / channel, the first being the instrument side: COMMENT / right (R) or left (L); and the second being COMMENT / the frequency: high (H) or low (L). The COMMENT / third and fourth characters indicate the scan COMMENT / mode, the third being the scan length: short COMMENT / (S) or long (L); and the fourth being the sca COMMENT n COMMENT / speed: slow (S) or fast (F). In addition, COMMENT / the scan mode may take the following values COMMENT / for low frequency data only (channel = RL or COMMENT / LL): COMMENT / FS: decimated SF data; COMMENT / FL: truncated LF data. MODLLABL= 'PASS4 ' / FIRAS calibration model solution label MISS_SEG= 'ENTIRE_MISSION' / FIRAS segment of mission represented NU_ZERO = 68.020812 / Optical frequency of initial data point in GHz DELTA_NU= 13.604162 / Optical frequency interval between data points COMMENT / in GHz NUM_FREQ= 43 / Number of frequency points with good data GALATEXC= 15 / Absolute value of galactic latitude in degrees COMMENT / below which input data was excluded in COMMENT / producing this dataset END
Extension Header 2
XTENSION= 'BINTABLE' / Extension type is Binary Table BITPIX = 8 / Binary data NAXIS = 2 / Data are in a table NAXIS1 = 730 / Number of 8 bit bytes in each row NAXIS2 = 43 / Number of rows PCOUNT = 0 / Number of bytes of data following table GCOUNT = 1 / Group count (always 1 for bintable extensions) TFIELDS = 2 / Number of fields (columns) in the table COMMENT COMMENT COMMENT FIRAS Covariance Matrix COMMENT Project Dataset Record Structure COMMENT COMMENT COMMENT Row number of covariance matrix TFORM1 = '1I ' / TTYPE1 = 'ROW_NUM ' / entire fieldname = ROW_NUM TUNIT1 = ' ' / COMMENT Row of covariance matrix, in (MJy/sr)^2 TFORM2 = '182E ' / TDIM2 = '(182) ' / TTYPE2 = 'ROW_COVR' / entire fieldname = ROW_COVR TUNIT2 = '(MJy/sr)^2' / COMMENT END
