***** File SOFTINFO.TXT                                                       
                                                                              
     This information file describes the SOFTWARE directory, which            
contains source and executable code which should be of use to the IHW Archive 
user.  The SOFTWARE directory is divided into subdirectories according to     
specific function or program, except for a general category of utilities.     
Source code (as ASCII fixed length text), binaries, or both may be included.  
                                                                              
     The IMDISP subdirectory contains software to display the image           
and spectral data contained on the IHW CD-ROMs; this software, provided by    
PDS/JPL and improved by outside users, works only in the PC MS-DOS            
environment.  The FTB subdirectory contains software to browse FITS Tables;   
this software, provided by the Astronomical Data Center (ADC) of the National 
Space Science Data Center (NSSDC, at NASA/GSFC), runs only in the VAX/VMS     
environment.  The UTILS subdirectory contains software to join or separate    
FITS headers and datafiles into true FITS byte streams; editors do not        
easily work with byte streams. This code runs in an MS-DOS environment, and   
was provided by IHW Large-Scale Phenomena Discipline at NASA/Goddard Space    
Flight Center.   For vol 26, in the EPHEMRIS directory is the source code for 
an extraction program (EXTRAJ.C) to be used with the "save tape" file         
provided for the ICE spacecraft encounter with comet Giacobini-Zinner.  In    
this same directory on Vol 25 is the GIODAT.FOR subroutine that was           
supplied by ESTEC for use with the GIOTTO ephemeris file (EPGIOTTO.DOC).      
                                                                              
     In some cases, there are true FITS files already on the CD.  These files 
have the extension .fit.  In other cases, the FITS files have been split      
into two parts, a FITS header with the extension .hdr and the actual data     
with the extensions .img or .dat or .tab.  The following instructions         
can be used to create true FITS files from the separate pieces under various  
operating systems.                                                            
                                                                              
1.  Unix operating system.                                                    
                                                                              
cat filename.hdr filename.img > ~/filename.fit                                
cat filename.hdr filename.tab > ~/filename.fit                                
and so on for each type of data.                                              
                                                                              
2.  VMS operating system.                                                     
                                                                              
copy filenam1.hdr,filenam2.tab disk$name:[rootname]filename.fit               
copy filenam1.hdr,filenam2.img disk$name:[rootname]filename.fit               
(alphabetical order is the header file and then data file, e.g., .hdr .img)   
                                                                              
3.  MS DOS operating system.                                                  
                                                                              
copy filename.hdr /b + filename.img /a d:\filename.fit                        
copy filename.hdr /b + filename.tab /a d:\filename.fit                        
(the switches for /b indicate no end of file and /a for an end of file)       
                                                                              
4.  Macintosh operating system.                                               
                                                                              
Use a utility that lets you join (or concatenate) any number of files in      
a single chunk.   (Such a program is "Chunkjoiner", available as shareware    
                                                                              
from Fabrizio Oddone which was found at Goddard Space Flight Center on the    
Goodies server selected through Appleshare and MAC network support, after     
logging into the MAC info center as Guest.   It works with data forks and     
can launch from a CDROM as well.  It operates under System 7.)