NJPL1D00PDS100000000           = SFDU_LABEL                                   
NOTE                           = "This structure describes the format         
 of an orbit table entry in a Viking IRTM Chunk File.  Note: An IRTM          
 'orbit' is denoted by the first revolution number of a set of                
 sequences grouped together and represented by a single entry in the          
 Orbit Table. It consists of data sequences from one or more (normally        
 one, occasionally a few) actual Viking Orbiter revolutions, which            
 were received in a single Experiment Data Record (EDR).  For more            
 information see the text file IRTMDATA.TXT."                                 
                                                                              
OBJECT                          = START_SEQUENCE_TABLE_ROW                    
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 1                                           
 BYTES                          = 2                                           
 NOTE                           = "First row in SEQUENCE_TABLE with           
  sequence data for current orbit"                                            
END_OBJECT                      = START_SEQUENCE_TABLE_ROW                    
                                                                              
OBJECT                          = STOP_SEQUENCE_TABLE_ROW                     
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 3                                           
 BYTES                          = 2                                           
 NOTE                           = "Last row in SEQUENCE_TABLE with            
  sequence data for current orbit"                                            
END_OBJECT                      = STOP_SEQUENCE_TABLE_ROW                     
                                                                              
OBJECT                          = SEQUENCES                                   
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 5                                           
 BYTES                          = 2                                           
 NOTE                           = "Number of sequences in orbit"              
END_OBJECT                      = SEQUENCES                                   
                                                                              
OBJECT                          = OBSERVATIONS                                
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 7                                           
 BYTES                          = 2                                           
 NOTE                           = "Number of data observations in             
  orbit"                                                                      
END_OBJECT                      = OBSERVATIONS                                
                                                                              
OBJECT                          = ORBITER_NUMBER                              
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 17                                          
 BYTES                          = 2                                           
 NOTE                           = "1 for Viking 1, 2 for Viking 2"            
END_OBJECT                      = ORBITER_NUMBER                              
                                                                              
OBJECT                          = ORBIT_NUMBER                                
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 19                                          
 BYTES                          = 2                                           
 NOTE                           = "Current orbit number"                      
END_OBJECT                      = ORBIT_NUMBER                                
                                                                              
OBJECT                          = START_YEAR                                  
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 21                                          
 BYTES                          = 2                                           
 NOTE                           = "Start year - 1900 of data in orbit"        
END_OBJECT                      = START_YEAR                                  
                                                                              
OBJECT                          = START_DAY                                   
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 23                                          
 BYTES                          = 2                                           
 NOTE                           = "Start day-of-year of data in orbit"        
END_OBJECT                      = START_DAY                                   
                                                                              
OBJECT                          = START_HOUR                                  
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 25                                          
 BYTES                          = 2                                           
 NOTE                           = "Start hour of data in orbit"               
END_OBJECT                      = START_HOUR                                  
                                                                              
OBJECT                          = START_MINUTE                                
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 27                                          
 BYTES                          = 2                                           
 NOTE                           = "Start minute of data in orbit"             
END_OBJECT                      = START_MINUTE                                
                                                                              
OBJECT                          = TEMPORARY_ORBIT_NUMBER                      
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 35                                          
 BYTES                          = 2                                           
 NOTE                           = "Temporary VO-2 orbit number used for       
  processing VO-1 Survey Mission Data (VO-1 orbit > 1000)"                    
END_OBJECT                      = TEMPORARY_ORBIT_NUMBER                      
                                                                              
OBJECT                          = IRTM_TAPE_FILE_ID                           
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 37                                          
 BYTES                          = 2                                           
 NOTE                           = "ID of IRTM SEED file tape from which       
  orbit data was selected for database"                                       
END_OBJECT                      = IRTM_TAPE_FILE_ID                           
                                                                              
OBJECT                          = ELAPSED_PROCESSING_DAY                      
 TYPE                           = VAX_INTEGER                                 
 START_BYTE                     = 39                                          
 BYTES                          = 2                                           
 NOTE                           = "Processing day of original orbit, in       
  days since Jan 0, 1976"                                                     
END_OBJECT                      = ELAPSED_PROCESSING_DAY                      
                                                                              
OBJECT                          = SEDR_HEADER_GROUP                           
 TYPE                           = UNDEFINED                                   
 START_BYTE                     = 41                                          
 BYTES                          = 200                                         
 NOTE                           = "Data from the Header of the                
  Supplementary Experiment Data Record (SEDR) in archaic (Varian              
  floating point) format. This data has been converted to VAX floating        
  point format in the IRTM cumulative directory files: TS1000.DAT and         
  TS2000.DAT.  See detached labels of those files for a description."         
END_OBJECT                      = SEDR_HEADER_GROUP                           
                                                                              
END