FITS Headers


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         
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     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     FIRAS specific keywords                                             
CHANSCAN= 'HIGH    '           /  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 =            612.18729 /  Optical frequency of initial data point in GHz
DELTA_NU=            13.604162 /  Optical frequency interval between data points
COMMENT                          / in GHz                                       
NUM_FREQ=                  170 /  Number of frequency points with good data     
GALATEXC=                   20 /  Absolute value of galactic latitude in degrees
COMMENT                          / below which input data was excluded in       
COMMENT                          / producing this dataset                       

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  =                  170 / 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    FIRAS Covariance Matrix                                              
COMMENT    Project Dataset Record Structure                                     
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'         /                                                

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