PDS_VERSION_ID = PDS3                                                         
                                                                              
RECORD_TYPE    = "STREAM"                                                     
                                                                              
OBJECT     = TEXT                                                             
  PUBLICATION_DATE = 2011-05-17                                               
  NOTE             = "AAREADME for supplementary indices"                     
END_OBJECT = TEXT                                                             
                                                                              
END                                                                           
                                                                              
Supplementary Indices                                                         
=====================                                                         
This directory contains supplementary indices that a user might find helpful  
in sorting through the data in this data set.  In most cases they have been   
extracted from the INDEX/ directories of the original HAL_0001-HAL_0018 CDROM 
volume set.  They were largely undocumented, but the INDXINFO.TXT file in     
this directory (from the HAL_0018 volume) provides some explanation of the    
meaning of each of the file extensions included.  The actual index contents   
are in the *.IDX files; the *.STR files provide column headings which are     
often suggestive; the *.HDR files are FITS headers that may contain some      
additional field descriptions.                                                
                                                                              
The index files present are:                                                  
                                                                              
  CALIB.*       This table appears to be associating specific observations    
                with the calibration observation used to reduce the data.     
                The first two columns correspond to LSPN file names in this   
                data set (without the extension); the date column can be      
                used to locate the files within the data and calibration      
                directories.                                                  
                                                                              
  EPHEM.*       This ephemeris for Comet Halley was actually copied from the  
                HAL_0023 volume, and covers a wider date range than the data  
                in this data set do.  An attempt was made to collect the      
                separate ephemeris tables originally supplied with the LSPN   
                data into one file, but numerous formatting errors were       
                discovered - some resulting in truncated numeric values.  It  
                was easier to include this table than try to correct the      
                combined tables. (The degree of confidence in this table is   
                high.)                                                        
                                                                              
  LSPNOBS.*     This table lists observatories, telescopes and the observers  
                who made use of them to contribute observations to this       
                data set.                                                     
                                                                              
  NETLARGE.*    This table, also copied from HAL_0023, lists all observations 
                submitted to the Large-Scale Phenomona Net with a large set   
                of observational parameters and conditions.  In addition to   
                the entries for the 1439 observations and 173 calibration     
                observations included in this data set, it has entires for    
                1771 additional attempted observations which returned null    
                results.  These 1771 attempts would have constituted the      
                data contents of the "null results" data set                  
                "IHW-C-LSPN-N-NDR-HALLEY-V1.0".                               
                                                                              
NOTE                                                                          
----                                                                          
The DOCUMENT/SUMMARY/INDEX/ subdirectory in this data set also contains       
copies of the NETLARGE.* and EPHEM.* tables that came from the final          
volume in the LSPN series (HAL_0018).  The HAL_0023 volume was prepared       
a year or two later, and in other respects appears to have fixed some         
typos, but both versions are included for the industrious users who care      
to chase down these details.