***** File TABL_IKS.DOC                                                       
                                                                              
   Mission: VEGA 1                                                            
Instrument: IKS                                                               
Submission: IKS Spectra FITS Files                                            
                                                                              
                                                                              
Original Format                                                               
                                                                              
   The data were received as 103 FITS files, numbered consecutively.  The     
   first file contained the final 6-12 micron spectrum; the second file       
   contained the data used to draw Figure 7 of the associated paper in        
   'Icarus'; the remaining 101 each contained a single spectrum.              
                                                                              
                                                                              
Reformatting at SBN                                                           
                                                                              
   o  The binary FITS files were converted to ASCII tables to facilitate      
      ease of use.  Scaling factors as listed in the FITS header BSCALE       
      keyword were applied to all values (wavelength and intensity).          
                                                                              
   o  It was noted that in each FITS header for a spectrum file there was     
      a COMMENT line containing a format number and distance to the comet     
      nucleus, in kilometers.  The original file numbers appeared to be       
      random with respect to these format numbers, but as format number       
      increased distance to the nucleus decreased.  The reformatted files     
      were, therefore, renamed.  The arbitrary sequence number was dropped    
      and the format number inserted into the spectrum file names.  The       
      first file was renamed "iksfinal.tab" and the second "iksfig7.tab".     
                                                                              
   o  The minimum and maximum values occurring in each column of the          
      resulting tables were determined and inserted into the PDS label        
      using the MAXIMUM and MINIMUM keywords.  Note that in the FITS label    
      the DATA-MAX and DATA-MIN keywords covered both wavelength and          
      intensity values, and are therefore not necessarily the same as         
      the MAXIMUM and MINIMUM values for any particular column in the         
      converted files.                                                        
                                                                              
                                                                              
Known Anomalies/Problems                                                      
                                                                              
   o  Three of the FITS files (numbers 9, 11 and 31) had different BSCALE     
      factors from the other files.  In the cases of files 11 and 31,         
      application of the given BSCALE factor yielded numbers in the same      
      regime as all the other spectrum files.  In file 9, however, applying   
      BSCALE yielded a difference of three orders of magnitude in the ranges  
      of the data values.  No reason could be found to account for this       
      difference.  It has been noted in the accompanying PDS label, but the   
      data have not been altered.                                             
                                                                              
   o  Values in the figure file, "iksfig7.tab", have one less significant     
      digit than those in the data files. (This is also the only file with    
      three columns, the third being and error value.)                        
                                                                              
   o  Note that in all the spectrum files the series of wavelength values,    
      in the left-hand column, is identical.                                  
                                                                              
                                                                              
                                                                              
Following is a translation list from old file number to new:                  
                                                                              
     Original      New                                                        
                                                                              
   iksir001.tab iksfinal.tab                                                  
   iksir002.tab iksfig7.tab                                                   
   iksir003.tab iks121.tab                                                    
   iksir004.tab iks140.tab                                                    
   iksir005.tab iks168.tab                                                    
   iksir006.tab iks100.tab                                                    
   iksir007.tab iks169.tab                                                    
   iksir008.tab iks167.tab                                                    
   iksir009.tab iks170.tab                                                    
   iksir010.tab iks113.tab                                                    
   iksir011.tab iks171.tab                                                    
   iksir012.tab iks077.tab                                                    
   iksir013.tab iks172.tab                                                    
   iksir014.tab iks136.tab                                                    
   iksir015.tab iks173.tab                                                    
   iksir016.tab iks125.tab                                                    
   iksir017.tab iks174.tab                                                    
   iksir018.tab iks117.tab                                                    
   iksir019.tab iks175.tab                                                    
   iksir020.tab iks109.tab                                                    
   iksir021.tab iks176.tab                                                    
   iksir022.tab iks088.tab                                                    
   iksir023.tab iks177.tab                                                    
   iksir024.tab iks032.tab                                                    
   iksir025.tab iks163.tab                                                    
   iksir026.tab iks138.tab                                                    
   iksir027.tab iks165.tab                                                    
   iksir028.tab iks134.tab                                                    
   iksir029.tab iks180.tab                                                    
   iksir030.tab iks129.tab                                                    
   iksir031.tab iks181.tab                                                    
   iksir032.tab iks123.tab                                                    
   iksir033.tab iks182.tab                                                    
   iksir034.tab iks119.tab                                                    
   iksir035.tab iks183.tab                                                    
   iksir036.tab iks115.tab                                                    
   iksir037.tab iks184.tab                                                    
   iksir038.tab iks111.tab                                                    
   iksir039.tab iks162.tab                                                    
   iksir040.tab iks102.tab                                                    
   iksir041.tab iks186.tab                                                    
   iksir042.tab iks098.tab                                                    
   iksir043.tab iks187.tab                                                    
   iksir044.tab iks079.tab                                                    
   iksir045.tab iks188.tab                                                    
   iksir046.tab iks034.tab                                                    
   iksir047.tab iks189.tab                                                    
   iksir048.tab iks141.tab                                                    
   iksir049.tab iks190.tab                                                    
   iksir050.tab iks139.tab                                                    
   iksir051.tab iks191.tab                                                    
   iksir052.tab iks137.tab                                                    
   iksir053.tab iks192.tab                                                    
   iksir054.tab iks135.tab                                                    
   iksir055.tab iks193.tab                                                    
   iksir056.tab iks133.tab                                                    
   iksir057.tab iks132.tab                                                    
   iksir058.tab iks131.tab                                                    
   iksir059.tab iks130.tab                                                    
   iksir060.tab iks128.tab                                                    
   iksir061.tab iks166.tab                                                    
   iksir062.tab iks127.tab                                                    
   iksir063.tab iks126.tab                                                    
   iksir064.tab iks161.tab                                                    
   iksir065.tab iks124.tab                                                    
   iksir066.tab iks160.tab                                                    
   iksir067.tab iks122.tab                                                    
   iksir068.tab iks159.tab                                                    
   iksir069.tab iks120.tab                                                    
   iksir070.tab iks158.tab                                                    
   iksir071.tab iks118.tab                                                    
   iksir072.tab iks157.tab                                                    
   iksir073.tab iks116.tab                                                    
   iksir074.tab iks156.tab                                                    
   iksir075.tab iks114.tab                                                    
   iksir076.tab iks155.tab                                                    
   iksir077.tab iks112.tab                                                    
   iksir078.tab iks152.tab                                                    
   iksir079.tab iks110.tab                                                    
   iksir080.tab iks151.tab                                                    
   iksir081.tab iks108.tab                                                    
   iksir082.tab iks150.tab                                                    
   iksir083.tab iks101.tab                                                    
   iksir084.tab iks149.tab                                                    
   iksir085.tab iks099.tab                                                    
   iksir086.tab iks148.tab                                                    
   iksir087.tab iks093.tab                                                    
   iksir088.tab iks147.tab                                                    
   iksir089.tab iks080.tab                                                    
   iksir090.tab iks146.tab                                                    
   iksir091.tab iks078.tab                                                    
   iksir092.tab iks145.tab                                                    
   iksir093.tab iks076.tab                                                    
   iksir094.tab iks144.tab                                                    
   iksir095.tab iks033.tab                                                    
   iksir096.tab iks143.tab                                                    
   iksir097.tab iks164.tab                                                    
   iksir098.tab iks142.tab                                                    
   iksir099.tab iks178.tab                                                    
   iksir100.tab iks179.tab                                                    
   iksir101.tab iks185.tab                                                    
   iksir102.tab iks030.tab                                                    
   iksir103.tab iks031.tab