PDS_VERSION_ID      = PDS3                                                    
RECORD_TYPE         = FIXED_LENGTH                                            
RECORD_BYTES        = 80                                                      
OBJECT              = TEXT                                                    
  PUBLICATION_DATE    = 2010-10-29                                            
  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.                                            
                                                                              
     DOCINFO.TXT, this file, is a summary of the contents of the DOCUMENT     
directory.  It is an ASCII file with an attached PDS label.  The file has     
fixed length records with 80 characters per record.  Each record ends with    
an ASCII carriage-return line-feed pair in positions 79 and 80.               
                                                                              
     ARCH_SIS.TXT is an ASCII file describing structure and contents of the   
archival volume.  It has an attached PDS label and fixed-length records with  
80 characters per record.  Each record ends with an ASCII carriage-return     
line-feed pair in positions 79-80.                                            
                                                                              
     TRK_2_25.TXT is an ASCII file describing structure and contents of       
Archival Tracking Data Files (ATDFs).  It has an attached PDS label and       
fixed-length records with 80 characters per record.  Each record ends with    
an ASCII carriage-return line-feed pair in positions 79-80.                   
                                                                              
     ATDF_TUT.TXT is an ASCII file which provides examples of how to read     
binary records in an ATDF.  A hexadecimal dump of the first few records       
of 0022078A.TDF is given, then the 'decoding' of the binary data into useful  
numbers and characters is given for the first three records.  This an ASCII   
file with 120 characters per record, including an ASCII carriage-return       
line-feed pair in positions 119 and 120.  It has an attached PDS label.       
                                                                              
     TRK_2_18.TXT is an ASCII file describing structure and contents of the   
Orbit Data File (ODF).  It has an attached PDS label and fixed-length         
records with 80 characters per record.  Each record ends with an ASCII        
carriage-return line-feed pair in positions 79 and 80.                        
                                                                              
     VENUS_GRAVITY_HANDBOOK.PDF is a PDF document that discusses the models   
and methods used in determining the gravity field. This document includes     
equations and figures that cannot be rendered in ASCII text, and therefore    
no ASCII version of this file is given. The PDF document may be viewed with   
free software from www.adobe.com and other sources.