***** File CALINFO.TXT                                                        
                                                                              
     This directory contains compressed digital calibration data associated   
with some of the Halley images obtained by the Large-Scale Phenomena Network. 
                                                                              
     Text tables linking calibration and Halley files are given in the file   
CALIB.TXT in the DOCUMENT subdirectory, and a delimited index of the same     
information is in the file CALIB.IDX in the INDEX subdirectory.  [N.B.:  most,
but not all calibration data are contained in separate files; some are        
deposited on the Halley images themselves.  Refer to the last section of      
CALIB.TXT.]                                                                   
                                                                              
     The type of calibration varies: there are sensitometer spots, step       
wedges, and standard stars, depending on what was provided by the original    
observers. FITS headers provide all of the known information about the        
calibration data sets, although in some cases no relative intensities for     
(e.g.) step wedges were provided by the observers.  A previous pixel          
compression technique was used on the calibration data in this directory and  
on the full-resolution Halley images in directory Cyymmmdd; refer to the file 
COMPRESS.TXT in the DOCUMENT subdirectory for specific details on compression.
A full description of the calibration data themselves is given in CALIB.TXT,  
also in the DOCUMENT subdirectory.                                            
                                                                              
     The extensions for files of calibration data follow the IHW filename     
conventions (.IMQ = compressed image, .HDR = header, .LBL = label).  To       
reconstruct the original FITS byte stream, the .HDR and the .IMQ files for the
appropriate observation must be concatenated.  The original FITS headers have 
been modified using the FITS extensions to take account of the fact that the  
data have been compressed.                                                    

 Name                    Last modified      Size  Description
 Parent Directory                             -   
 calinfo.txt             04-May-1990 05:45  2.3K  
 lspn4023.hdr            07-Jan-1990 08:45   14K  [FITS header]
 lspn4023.imq            07-Jan-1990 08:46  264K  
 lspn4023.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4024.hdr            07-Jan-1990 08:46  8.4K  [FITS header]
 lspn4024.imq            07-Jan-1990 08:46   11K  
 lspn4024.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4025.hdr            07-Jan-1990 08:46  8.4K  [FITS header]
 lspn4025.imq            07-Jan-1990 08:46   11K  
 lspn4025.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4026.hdr            07-Jan-1990 08:46  8.4K  [FITS header]
 lspn4026.imq            07-Jan-1990 08:46   11K  
 lspn4026.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4027.hdr            07-Jan-1990 08:46  8.4K  [FITS header]
 lspn4027.imq            07-Jan-1990 08:46   11K  
 lspn4027.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4028.hdr            07-Jan-1990 08:46   11K  [FITS header]
 lspn4028.imq            07-Jan-1990 08:46   51K  
 lspn4028.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4029.hdr            07-Jan-1990 08:46  8.4K  [FITS header]
 lspn4029.imq            07-Jan-1990 08:46   56K  
 lspn4029.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4030.hdr            07-Jan-1990 08:46   11K  [FITS header]
 lspn4030.imq            07-Jan-1990 08:46   45K  
 lspn4030.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4031.hdr            07-Jan-1990 08:46   11K  [FITS header]
 lspn4031.imq            07-Jan-1990 08:46   65K  
 lspn4031.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4032.hdr            07-Jan-1990 08:46   11K  [FITS header]
 lspn4032.imq            07-Jan-1990 08:46   68K  
 lspn4032.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4033.hdr            07-Jan-1990 08:46   11K  [FITS header]
 lspn4033.imq            07-Jan-1990 08:46  357K  
 lspn4033.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4034.hdr            07-Jan-1990 08:46  8.4K  [FITS header]
 lspn4034.imq            07-Jan-1990 08:46   11K  
 lspn4034.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4035.hdr            07-Jan-1990 08:46  8.4K  [FITS header]
 lspn4035.imq            07-Jan-1990 08:46   11K  
 lspn4035.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4036.hdr            07-Jan-1990 08:31   11K  [FITS header]
 lspn4036.imq            07-Jan-1990 08:46   65K  
 lspn4036.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4037.hdr            07-Jan-1990 08:46   11K  [FITS header]
 lspn4037.imq            07-Jan-1990 08:47  360K  
 lspn4037.lbl            30-Apr-1990 05:45  1.6K  [PDS label]
 lspn4038.hdr            07-Jan-1990 08:47   11K  [FITS header]
 lspn4038.imq            07-Jan-1990 08:47  360K  
 lspn4038.lbl            30-Apr-1990 05:45  1.6K  [PDS label]