PDS_VERSION_ID        = PDS3                                                  
RECORD_TYPE           = STREAM                                                
OBJECT                = TEXT                                                  
  PUBLICATION_DATE    = 2013-03-08                                            
  NOTE                = "Description of the CATALOG directory contents        
                         for the NS CDR/DDR archive volume."                
END_OBJECT            = TEXT                                                  
END                                                                           
                                                                              
This subdirectory contains the catalog object files for the entire volume.
The following files are included in the catalog subdirectory.

CATINFO.TXT: Identifies and describes of function of each file in the
catalog directory.

CDR_DS.CAT: Describes the general content of the CDR data set and includes 
information about the duration of the mission and the person or group 
responsible for producing the data. 

DDR_DS.CAT: Describes the general content of the DDR data set and includes 
information about the duration of the mission and the person or group 
responsible for producing the data.

NS_INST.CAT: Describes physical attributes of the NS instrument and provides
relevant references to published literature.

INSTRUMENT_HOST.CAT: Describes the MESSENGER spacecraft.

MISSION.CAT: Describes the scientific goals and objectives of the MESSENGER
program. It also identifies key people and institutions.

PERSON.CAT: Lists and provides contact information for the people involved
with the NS instrument on the MESSENGER mission.

REF.CAT: Provides references (reference objects) to scientific papers and
other publications of interest to those using the data, both for NS and the
mission as a whole.