PDS_VERSION_ID      = PDS3                                                    
                                                                              
RECORD_TYPE         = FIXED_LENGTH                                            
RECORD_BYTES        = 80                                                      
OBJECT              = TEXT                                                    
  PUBLICATION_DATE    = 1995-07-10                                            
  NOTE                = "Description of contents of CATALOG                   
                         directory "                                          
END_OBJECT          = TEXT                                                    
END                                                                           
                                                                              
                                                                              
                                                                              
      The CATALOG directory contains mission, host, instrument,               
reference, personnel, and data set PDS catalog objects for                    
this archive volume.  The files follow the 'streamlined' format               
adopted by the Planetary Data System (PDS) in late 1993 and                   
documented in the Planetary Data System Standards Reference                   
(Version 3.1, 3 August 1994; JPL D-7669, Part 2).                             
                                                                              
     Each catalog object is in ASCII, with a maximum of 78                    
characters per line.  Each line is delimited with a carriage-                 
return (ASCII 13) line-feed (ASCII 10) pair.                                  
                                                                              
     The templates are:                                                       
                                                                              
MISSION.CAT                                                                   
                                                                              
     A brief description of the mission.  It includes a                       
chronology of events, definition of mission phases, and science               
objectives.                                                                   
                                                                              
                                                                              
VL1HOST.CAT                                                                   
VL2HOST.CAT                                                                   
                                                                              
     A description of the Viking Lander and Viking Orbiter                    
spacecrafts (1 and 2).                                                        
                                                                              
                                                                              
VL1INST.CAT                                                                   
VL2INST.CAT                                                                   
                                                                              
     An overview of the Viking Meteorology Instrument System                  
used aboard the Viking Landers.                                               
                                                                              
Note: The VL1/VL2-M-LCS-5-ATMOS-OPTICAL-DEPTH-V1.0 dataset                    
      was derived from the Viking Lander Camera System (LCS).                 
      The LCS instrument template is not included within this                 
      achive, is a lean against the completion of this archive.               
      The LCS instrument template is scheduled to be completed                
      by early '96 by Washington University (GEO/WASHU).                      
                                                                              
                                                                              
VL_P.CAT                                                                      
VL_AVEP.CAT                                                                   
VL_MBIN.CAT                                                                   
VL_TBIN.CAT                                                                   
VL_OPAC.CAT                                                                   
                                                                              
     A description of the data sets contained in the archival                 
volume.  These files include information on the primary data                  
types included in this archive.  Brief discussions of the quality             
of the data are included where applicable.  The data sets in the              
archive volume are:                                                           
                                                                              
    Meteorology Calibrated Data Pressure         [VL_P]                       
    Meteorology Resampled Daily Average Pressure [VL_AVEP]                    
    Meteorology Resampled Data Binned P-T-V-CORR [VL_MBIN]                    
    Meteorology Resampled Data Binned P-T-V      [VL_TBIN]                    
    Atmospheric Optical Depth                    [VL_OPAC]                    
                                                                              
                                                                              
                                                                              
REFS.CAT                                                                      
                                                                              
     A listing of references used elsewhere in the streamlined                
templates and of references that might be generally useful in                 
working with these data.                                                      
                                                                              
                                                                              
PERS.CAT                                                                      
                                                                              
     A listing of key people involved in analyzing the radio                  
data and in producing the archival data set.