PDS_VERSION_ID     = PDS3                                                     
RECORD_TYPE        = "STREAM"                                                 
                                                                              
OBJECT             = TEXT                                                     
  NOTE             = "AAREADME file for the third volume of the               
    data set containing Lunar Atmospheric Density plots from the              
    Apollo 15 Cold Cathode Ion Gage (CCIG)"                                   
  PUBLICATION_DATE = 2007-09-30                                               
END_OBJECT         = TEXT                                                     
                                                                              
END                                                                           
                                                                              
Introduction                                                                  
============                                                                  
                                                                              
  This volume contains digitized plots of the density of the lunar            
  atmosphere as measured by the Apollo 15 Cold Cathode Ion Gage from          
  16 June 1972 through 31 December 1972.                                      
                                                                              
  The files were scanned directly from microfilm.  The original scans         
  were done with the optimal focus and contrast, but no attempts were         
  made to enhance the digital images.  Some images are difficult to           
  read and may benefit from further enhancement by the user.                  
                                                                              
                                                                              
Volume Format                                                                 
=============                                                                 
                                                                              
  This volume has been formatted according to the ISO-9660 level 2            
  Interchange Standard for directories and file names.                        
                                                                              
                                                                              
File Formats                                                                  
============                                                                  
                                                                              
  All text documents and other meta information files such as                 
  descriptions, PDS object definitions and detached PDS labels are            
  stream format files, with a carriage return (ASCII 13) and a line           
  feed character (ASCII 10) at the end of the record.  This allows            
  the files to be read by various operating systems.                          
                                                                              
                                                                              
Volume Contents                                                               
===============                                                               
                                                                              
  Files on this volume are organized into a set of subdirectories             
  below the top-level directory.  The following table shows the               
  structure and content of these directories. In the table, directory         
  names are enclosed in square brackets ([]).  See the *INFO.TXT files        
  in some directories for specific information on the files in that           
  directory.                                                                  
                                                                              
  [TOP-LEVEL-DIRECTORY]                                                       
  |                                                                           
  |-- AAREADME.TXT         This file                                          
  |                                                                           
  |-- VOLDESC.CAT          Description of the contents of this volume         
  |                                                                           
  |--[CATALOG]             Directory containing PDS catalog objects           
  |  |                                                                        
  |  |-- CATINFO.TXT       Description of files in this subdirectory          
  |  |-- DATASET.CAT       Description of this data set                       
  |  |-- INST.CAT          Description of the CCIG instrument                 
  |  |-- INSTHOST.CAT      Description of the ALSEP instrument host           
  |  |-- MISSION.CAT       Description of the Apollo 15 mission               
  |  |-- PERSON.CAT        List of personnel who created this volume          
  |  |-- REF.CAT           List of publications mentioned in catalog files    
  |  +-- MOON.CAT          Description of the Moon                            
  |                                                                           
  |--[DATA]                Directory containing data product                  
  |  |                                                                        
  |  |-- A15A_CCIG_72_M018174_PART2.TAB  Table of parameters for lunar density
  |  |                                   data plots in DOCUMENT directory     
  |  +-- A15A_CCIG_72_M018174_PART2.LBL  PDS label                            
  |                                                                           
  |--[DOCUMENT]        Directory of digitized plots of CCIG data              
  |  |                                                                        
  |  |-- DOCINFO.TXT   Refers user to relevant documents                      
  |  |                                                                        
  |  |-- A15_PSR.PDF   Apollo 15 Preliminary Science Report                   
  |  |-- A15_PSR.LBL   PDS label                                              
  |  |                                                                        
  |  |--[DENSITY_PLOTS]                                                       
  |  |  |                                                                     
  |  |  |-- A15A_CCIG_72_M018174*.TIF  Digitized plots of CCIG data           
  |  |  +-- A15A_CCIG_72_M018174*.LBL  PDS label for each plot                
  |  |                                                                        
  |  |-- LANDING_SITE_TRAVERSE.PNG  Graphic of landing site                   
  |  |-- LANDING_SITE_TRAVERSE.LBL  PDS label for landing site graphic        
  |  |                                                                        
  |  |-- SOLAR_EPHEMERIS.ASC  Solar ephemeris for Apollo 15 CCIG instrument   
  |  +-- SOLAR_EPHEMERIS.LBL  PDS label                                       
  |                                                                           
  |--[EXTRAS]                                                                 
  |  |                                                                        
  |  |-- EXTRINFO.TXT  Description of files in the EXTRAS directory           
  |  |                                                                        
  |  +-- [DENSITY_PLOTS_BROWSE]                                               
  |      |                                                                    
  |      +-- A15A_CCIG_72_M018174*_TN.JPG  Thumbnails of the large CCIG       
  |                                        plots in the DOCUMENT directory    
  |                                                                           
  +--[INDEX]               Directory containing index files                   
     |                                                                        
     |-- INDXINFO.TXT      Description of files in the INDEX directory        
     |-- INDEX.TAB         Table locating data files on this volume           
     |-- INDEX.LBL         PDS label for INDEX.TAB                            
     |-- CUMINDEX.TAB      Cumulative index for this multi-volume data set    
     |-- CUMINDEX.LBL      PDS label for CUMINDEX.TAB                         
     |-- CHECKSUM.TAB      Checksum file for this volume                      
     +-- CHECKSUM.LBL      PDS label for CHECKSUM.TAB                         
                                                                              
                                                                              
Whom to Contact for Information                                               
===============================                                               
                                                                              
For questions concerning this volume set, contact:                            
                                                                              
  National Space Science Data Center                                          
  Goddard Space Flight Center                                                 
  Greenbelt, MD 20771 USA                                                     
  (301) 286-6695                                                              
                                                                              
  Web Site:  http://nssdc.gsfc.nasa.gov/                                      
  E-mail:    request@nssdc.gsfc.nasa.gov                                      
                                                                              
For general information related to the PDS, contact:                          
                                                                              
  Planetary Data System, PDS Operator                                         
  M/S 202-101                                                                 
  Jet Propulsion Laboratory                                                   
  4800 Oak Grove Drive                                                        
  Pasadena, CA  91109-8099                                                    
  (818) 354-4321                                                              
                                                                              
  Web Site:  http://pds.jpl.nasa.gov/                                         
  E-mail:    pds_operator@jpl.nasa.gov