PDS_VERSION_ID      = PDS3                                                    
RECORD_TYPE         = FIXED_LENGTH                                            
RECORD_BYTES        = 80                                                      
OBJECT              = TEXT                                                    
  PUBLICATION_DATE    = 2000-09-13                                            
  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; except where indicated, there are 80 characters   
per line in each file.  Each line is delimited with a carriage-return (ASCII  
13) line-feed (ASCII 10) pair.                                                
                                                                              
     The files are:                                                           
                                                                              
                                                                              
DOCINFO.TXT                                                                   
                                                                              
     A brief description of the files within the DOCUMENT directory (this     
file).                                                                        
                                                                              
RSADCSDP.TXT                                                                  
                                                                              
     A Software Interface Specification (SIS) for the archival volume.  This  
document describes the structure and content of the volume.                   
                                                                              
RSTP.TXT                                                                      
                                                                              
     The SIS for files containing temperature-pressure profiles derived from  
radio occultation measurements.  Two versions of the profiles are covered:    
standard resolution (data type TPS) and high-resolution (TPH).                
                                                                              
OCCSUM.TXT                                                                    
                                                                              
     The SIS for Occultation Summary files.  Two versions of the file are     
covered: files containing summaries of standard resolution profiles (data     
type OCS) and files containing summaries from high-resolution profiles (OCH). 
                                                                              
LOSAPDR.TXT                                                                   
                                                                              
     The SIS for Line of Sight Acceleration Profile Data Records (data        
type LOS).                                                                    
                                                                              
SHADR.TXT                                                                     
                                                                              
     The SIS for files containing Spherical Harmonic models (such as gravity  
fields or topography) in ASCII formats (data type SHA).                       
                                                                              
SHBDR.TXT                                                                     
                                                                              
     The SIS for files containing Spherical Harmonic models (such as gravity  
fields or topography) in binary formats (data type SHB).                      
                                                                              
RSDMAP.TXT                                                                    
                                                                              
     The SIS for Radio Science Digital Map products (data type IMG).          
                                                                              
EDS.TXT                                                                       
                                                                              
     The SIS for ionospheric electron density profiles, produced occasionally 
as a by-product of the radio occultation investigation.  Two versions of the  
profiles are covered: standard resolution data (data type EDS) and            
high-resolution (EDH).                                                        
                                                                              
SRX.TXT                                                                       
                                                                              
     The SIS for files produced during the Surface Reflection investigation.  
There are three data types: geometry (SRG), images (SRI), and tabulated       
calibrated observables (SRT).                                                 
                                                                              
OCCLOGA2.TAB                                                                  
                                                                              
     A table of data acquisition parameters from radio occultation            
opportunities during November and December 1998 (when the EDS data were       
acquired).  The table gives dates and times, DSN antenna numbers,             
signal-to-noise ratio, and file names of the ODR file for each observation    
opportunity.  There are also terse indicators of data quality.  Detached      
label  OCCLOGA2.LBL  describes the format and content of OCCLOGA2.TAB in      
detail.                                                                       
                                                                              
OCCLOGM1.TAB                                                                  
                                                                              
     A table of data acquisition parameters from radio occultation            
opportunities during the first 5-6 months of Mapping.  The table gives dates  
and times, DSN antenna numbers, signal-to-noise ratio, and file names of the  
ODR file for each observation opportunity.  There are also terse indicators   
of data quality.  Detached label  OCCLOGM1.LBL  describes the format and      
content of OCCLOGM1.TAB in detail.