PDS_VERSION_ID              = PDS3                                            
RECORD_TYPE                 = STREAM                                          
OBJECT                      = TEXT                                            
  PUBLICATION_DATE          = 2014-04-11                                      
  INTERCHANGE_FORMAT        = ASCII                                           
  NOTE                      = "Description of the EXTRAS directory"           
END_OBJECT                  = TEXT                                            
END                                                                           
                                                                              
                     EXTRAS Directory Contents                                
                                                                              
The EXTRAS directory contains additional files beyond the scope               
of the PDS archive requirements.                                              
                                                                              
The following files are found in the EXTRAS directory:                        
                                                                              
EXTRINFO.TXT           - The file you are now reading                         
                                                                              
V15V16ROEPROFILES.SAV  - An IDL save file that contains all the               
                         information in the DATA/ directory.                  
                                                                              
                                                                              
Users who possess the free IDL Virtual Machine software or who                
possess a non-free licensed version of IDL can use                            
V15V16ROEPROFILES.SAV to quickly access and manipulate the                    
results of the Venera 15 and 16 radio occultation experiment.                 
V15V16ROEPROFILES.SAV contains two arrays - ANCARR and EDSARR.                
                                                                              
ANCARR is a 29 x 7 string array. Each of the 29 rows pertains to one          
occultation. The first column contains the name of spacecraft                 
(V15 or V16). The second column contains the date of the occultation          
in the Moscow winter timezone. The third column contains the time of          
the occultation in the Moscow winter timezone. The fourth column              
contains the latitude of the occultation in degrees north. The fifth          
column contains the longitude of the occultation in degrees west.             
The sixth column contains the solar zenith angle of the occultation           
in degrees west. The seventh column contains the name of original             
file supplied by A. L. Gavrik. This information can also be found in          
the DATA/ANC/ directory.                                                      
                                                                              
EDSARR is a 29 x 2 x 400 double-precision array. Each of the 29 rows          
pertains to one occultation. The first column contains 400 values for         
altitude in km. The second column contains the corresponding values for       
electron density in number per cubic centimeter. Since the number of          
data points in a given profile varies from profile to profile, not all        
400 values are necessarily meaningful. If both altitude and electron          
density are zero, then the values should be discarded. This information       
can also be found in the DATA/EDS/ directory.                                 
                                                                              
In the event of inconsistencies between information in the DATA/ and          
EXTRAS/ directories, the information in the DATA/ directory should            
be given precedence.