PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM
OBJECT                = TEXT
  PUBLICATION_DATE    = 2012-07-10
  NOTE                = "Description of contents of INDEX directory"
END_OBJECT            = TEXT
END

Files in the Index directory are provided to help the user locate products
in the archive. There is one index table for each of the four SAM RDR data 
sets. Each index table (file name L*_INDEX.TAB) is described by a PDS label
in a separate file (named L*_INDEX.LBL). Both files are text files. A TAB
file has one row for each SAM RDR product in the data set. The columns in 
the row are fixed-width, separated by commas, with character fields 
enclosed in double quotation marks ("). Each row ends with the ASCII 
carriage return and line feed characters. Index tables can be loaded into 
spreadsheet programs such as Excel for ease of searching. The label file
defines each column and gives its start byte, number of bytes, and data type.

The index tables contain these columns:

1. Volume ID
2. Path name
3. File name
4. Product ID
5. Product version ID
6. Product creation time
7. Release ID
8. Start time
9. Stop time
10. Spacecraft clock start count
11. Spacecraft clock stop count
12. Local mean solar time 
13. Planet day (sol) number
14. Observation ID
15. Solar longitude
16. SAM experiment ID
17. SAM GC column number

Currently the entire SAM RDR archive is contained on the single archive
volume MSLSAM_1XXX. If it ever becomes necessary to divide the archive
into multiple volumes, then the L*_INDEX.TAB files will list only the 
products on a single volume, and additional index tables named 
L*_CUMINDEX.TAB will be provided that list the products on all volumes.