PDS_VERSION_ID = PDS3 
RECORD_TYPE = FIXED_LENGTH 
RECORD_BYTES = 80 
OBJECT = TEXT 
PUBLICATION_DATE = 2010-07-15 
NOTE = "Description of the INDEX directory contents for the Huygens DTWG data
set." 
END_OBJECT = TEXT 
END 

The INDEX directory contains an index for this volume (INDEX.TAB) Accompanying each product files is a PDS label (INDEX.LBL).
The *.TAB files are ASCII files.  Each line (or record) in INDEX.TAB contains information about a single data file in this data archive volume.
Each line in a *.TAB file is made up of comma-delimited fixed-length fields.