PDS_VERSION_ID        = PDS3                                                  
LABEL_REVISION_NOTE   = "2014-02-09, C. See"                          
RECORD_TYPE           = STREAM                                                
                                                                              
OBJECT                = TEXT                                                  
  INTERCHANGE_FORMAT  = ASCII                                                 
  PUBLICATION_DATE    = 2006-10-06                                            
  NOTE                = "Description of contents in the EXTRAS                
                         subdirectory."                                       
END_OBJECT            = TEXT                                                  
END                                                                           
                                                                              
           Content Description of the EXTRAS Subdirectory                     
                                                                              
The EXTRAS subdirectory on this dataset volume contains useful 'extra'        
material associated with the DISR instrument Archive. Following is a list of  
the subdirectories contained in this subdirectory and a description of each: 
                                                                              
FILE               DESCRIPTION                                                
-----------        --------------------------------------------------         
                                                                              
DISR3_CALIBRATION_DATA  See Below
DISR_IN-FLIGHT_DATA     See Below
DISR_XDR_DATA           See Below
IDL_PROGRAMS            See Below

IMAGE_ELEMENTS     Improved DISR images + supporting data (darks, flats, etc).
MOSAICS            Mosaicked images.                                          
MOVIES             Movies of the descent sequence.                            
POSTERS            Poster quality figures with captions.  
PROBE_ATTITUDE     Tables of probe altitude and attitude during the descent.
PROCESSED_IMAGES   Images after processing by Erich Karkoschka.               
RENDERINGS         Movies generated from stereographic renderings using       
                   orthorectified DISR images                                 

Late-arriving (2014-01) archive support files include:

DISR3_CALIBRATION_DATA:  The labratory calibration data from the flight unit 
(DISR 03) in eXternal Data Representation (XDR) format, and in the file 
structure created by the labratory Ground Support Equipment (RTGSE & WGSE), 
so as to be compatible with the IDL source code deposited in directory 
IDL_PROGRAMS. The DISR 03 lab calibration is from 1996, with a couple of
additional tests on flight spare optics taken in 2001.  Also in this directory 
is a copy of the calibration data companion document written in 2012.

DISR_IN-FLIGHT_DATA: Data taken on the DISR flight instrument from the time 
of its mating to the Huygens Probe in 1996 until the Titan encounter in 2005. 
The data are in XDR format and the original directory structure so as to be 
compatable with the IDL source code presented in neighboring directory 
IDL_PROGRAMS. Also contined in the directory are the In-flight test reports, 
and a companion document (DISR_IDL_CODE_DOC) which describe the tests and
data.

DISR_XDR_DATA:  The raw Titan encounter in its original XDR format and 
directory structury to make it compatable with the IDL source code in the 
IDL_PROGRAMS directory.  The original ESCC data streams and several data 
replays (reconstructions) are included.  "stream_524b" is the one used to 
generate the PDS archive files.  A companion document explaining the data
volume is also included (DISR_XDR_DATA_DOC).

IDL_PROGRAMS: Contains much of the Interactive Developement Language (IDL) 
source code files generated by the DISR team while calibrating the DISR and 
interprating the data.  The code is segragated by author, and is generally 
undocumented, although some explanatory documents are also included 
(SOFTWARE_SUPPORT_DOCUMENTS), as well as a directory companion document 
(DISR_IDL_CODE_DOC) to help orientent the data user.