SIMPLE  =                    T / file does conform to FITS standard             
BITPIX  =                   16 / 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 
END                                                                             
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XTENSION= 'BINTABLE'           / binary table extension                         
BITPIX  =                    8 / 8-bit bytes                                    
NAXIS   =                    2 / 2-dimensional binary table                     
NAXIS1  =                    8 / width of table in bytes                        
NAXIS2  =             50331648 / number of rows in table                        
PCOUNT  =                    0 / size of special data area                      
GCOUNT  =                    1 / one data group (required keyword)              
TFIELDS =                    1 / number of fields in each row                   
TTYPE1  = 'SIGNAL  '           / label for field   1                            
TFORM1  = '1D      '           / data format of field: 8-byte DOUBLE            
EXTNAME = 'MAP     '           / name of this binary table extension            
PIXTYPE = 'HEALPIX '           / HEALPIX pixelisation                           
ORDERING= 'RING    '           / Pixel ordering scheme, either RING or NESTED   
NSIDE   =                 2048 / Resolution parameter for HEALPIX               
FIRSTPIX=                    0 / First pixel # (0 based)                        
LASTPIX =             50331647 / Last pixel # (0 based)                         
INDXSCHM= 'IMPLICIT'           / Indexing: IMPLICIT or EXPLICIT                 
END