***** 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             01-Feb-1990 04:45  2.3K  
 lspn4001.hdr            01-Feb-1990 04:45  8.4K  [FITS header]
 lspn4001.imq            01-Feb-1990 04:45   28K  
 lspn4001.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4002.hdr            01-Feb-1990 04:45   11K  [FITS header]
 lspn4002.imq            01-Feb-1990 04:45  357K  
 lspn4002.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4003.hdr            01-Feb-1990 04:45   11K  [FITS header]
 lspn4003.imq            01-Feb-1990 04:45  357K  
 lspn4003.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4004.hdr            01-Feb-1990 04:45   11K  [FITS header]
 lspn4004.imq            01-Feb-1990 04:45  301K  
 lspn4004.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4005.hdr            01-Feb-1990 04:45   11K  [FITS header]
 lspn4005.imq            01-Feb-1990 04:45  360K  
 lspn4005.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4006.hdr            01-Feb-1990 04:45   11K  [FITS header]
 lspn4006.imq            01-Feb-1990 04:45   70K  
 lspn4006.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4007.hdr            01-Feb-1990 04:45   11K  [FITS header]
 lspn4007.imq            01-Feb-1990 04:45   73K  
 lspn4007.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4008.hdr            01-Feb-1990 04:45   14K  [FITS header]
 lspn4008.imq            01-Feb-1990 04:45  262K  
 lspn4008.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4009.hdr            01-Feb-1990 04:45   14K  [FITS header]
 lspn4009.imq            01-Feb-1990 04:45  264K  
 lspn4009.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4010.hdr            01-Feb-1990 04:45   11K  [FITS header]
 lspn4010.imq            01-Feb-1990 04:45  357K  
 lspn4010.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4011.hdr            01-Feb-1990 04:45   11K  [FITS header]
 lspn4011.imq            01-Feb-1990 04:45  363K  
 lspn4011.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4012.hdr            01-Feb-1990 04:45   14K  [FITS header]
 lspn4012.imq            01-Feb-1990 04:45  262K  
 lspn4012.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4013.hdr            01-Feb-1990 04:45   14K  [FITS header]
 lspn4013.imq            01-Feb-1990 04:45  262K  
 lspn4013.lbl            01-Feb-1990 04:45  1.6K  [PDS label]
 lspn4014.hdr            01-Feb-1990 04:45   11K  [FITS header]
 lspn4014.imq            01-Feb-1990 04:45  360K  
 lspn4014.lbl            01-Feb-1990 04:45  1.6K  [PDS label]