PDS_VERSION_ID      = PDS3                                                    
RECORD_TYPE         = FIXED_LENGTH                                            
RECORD_BYTES        = 80                                                      
OBJECT              = TEXT                                                    
  PUBLICATION_DATE    = 1997-12-21                                            
  NOTE                = "Description of contents of DOCUMENT directory "      
END_OBJECT          = TEXT                                                    
END                                                                           
                                                                              
                                                                              
                                                                              
      The DOCUMENT directory contains documentation on the archival data      
set and files within the data set.                                            
                                                                              
     Each file is in ASCII, with 80 characters per line.  Each line is        
delimited with a carriage-return (ASCII 13) line-feed (ASCII 10) pair.        
                                                                              
     The files are:                                                           
                                                                              
                                                                              
DOCINFO.TXT                                                                   
                                                                              
     A brief description of this files within the DOCUMENT directory          
(this file).                                                                  
                                                                              
                                                                              
TRK_2_18.TXT                                                                  
                                                                              
     SIS for the Orbit Data File (ODF), which contain partially processed     
radio science data from the DSN.                                              
                                                                              
TRK_2_21.TXT                                                                  
                                                                              
     SIS for the Earth Orientation Parameter (EOP) file, which contains       
data on rotation of the Earth.                                                
                                                                              
TRK_2_23.TXT                                                                  
                                                                              
     SIS for Media Calibration Files -- Ionosphere Calibration files (ION)    
and Troposphere Calibration files (TRO).                                      
                                                                              
                                                                              
TRK_2_25.TXT                                                                  
                                                                              
     SIS for DSN Archival Tracking Data File (ATDF) containing raw radio      
science data from the DSN.