SFD98 E(B-V) Map
FITS Header Information

Primary Header

SIMPLE  =                    T / file does conform to FITS standard             
BITPIX  =                    8 / 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    = '2003-02-05T00:00:00' /file creation date (YYYY-MM-DDThh:mm:ss UT)    
OBJECT  = 'ALL-SKY '           / Portion of sky given                           
COMMENT   This file contains an all-sky Galactic reddening map, E(B-V), based on
COMMENT   the derived reddening maps of Schlegel, Finkbeiner and Davis (1998).  
COMMENT   Software and data files downloaded from their website were used to    
COMMENT   interpolate their high resolution dust maps onto pixel centers        
COMMENT   appropriate for a HEALPix Nside=512 projection in Galactic            
COMMENT   coordinates. This file is distributed and maintained by LAMBDA.       
REFERENC= 'Legacy Archive for Microwave Background Data Analysis (LAMBDA)       
REFERENC= '                http://lambda.gsfc.nasa.gov/                         
REFERENC= 'Maps of Dust Infrared Emission for Use in Estimation of Reddening and
REFERENC= ' Cosmic Microwave Background Radiation Foregrounds',                 
REFERENC= ' Schlegel, Finkbeiner & Davis 1998 ApJ 500, 525                      
REFERENC= 'Berkeley mirror site for SFD98 data: http://astron.berkeley.edu/dust/
REFERENC= 'Princeton mirror site for SFD98 data:                                
REFERENC= '                           http://astro/princeton.edu/~schlegel/dust/
REFERENC= 'HEALPix Home Page: http://www.eso.org/science/healpix/               
RESOLUTN=                    9 / Resolution index                               
SKYCOORD= 'Galactic'           / Coordinate system                              
PIXTYPE = 'HEALPIX '           / Pixel algorithm                                
ORDERING= 'NESTED  '           / Ordering scheme                                
NSIDE   =                  512 / Resolution parameter                           
NPIX    =              3145728 / # of pixels                                    
FIRSTPIX=                    0 / First pixel (0 based)                          
LASTPIX =              3145727 / Last pixel (0 based)                           
END                                                                             

Extension Header #1

XTENSION= 'BINTABLE'           /binary table extension                          
BITPIX  =                    8 /8-bit bytes                                     
NAXIS   =                    2 /2-dimensional binary table                      
NAXIS1  =                    8 /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 =                    2 /number of fields in each row                    
TTYPE1  = 'TEMPERATURE'        /label for field   1                             
TFORM1  = '1E      '           /data format of field: 4-byte REAL               
TUNIT1  = 'magnitudes'         /physical unit of field                          
TTYPE2  = 'N_OBS   '           /label for field   2                             
TFORM2  = '1E      '           /data format of field: 4-byte REAL               
TUNIT2  = 'counts  '           /physical unit of field                          
EXTNAME = 'Archive Map Table'  /name of this binary table extension             
DATE    = '2003-02-05T00:00:00' /Table creation date                            
PIXTYPE = 'HEALPIX '           /Pixel algorithm                                 
ORDERING= 'NESTED  '           /Ordering scheme                                 
NSIDE   =                  512 /Resolution parameter                            
FIRSTPIX=                    0 /First pixel (0 based)                           
LASTPIX =              3145727 /Last pixel (0 based)                            
COMMENT   The TEMPERATURE field contains E(B-V) in magnitudes.                  
COMMENT   N_obs is set to 1 for all pixels. The N_obs field is filled           
COMMENT    only to provide a format consistent with that used by                
COMMENT    WMAP products.                                                       
END                                                                             

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