***** File ERRSINFO.TXT                                                       
                                                                              
     Original identification of the errata reported in this directory is      
principally due to the IHW Lead Center (LC) at the Jet Propulsion Laboratory  
(JPL), and in particular to Mikael Aronsson.  The major exception to this is  
the errata for the Large-Scale Phenomena (L-SP) Discipline, which is reported 
by the L-SP Discipline Specialist (M. B. Niedner).                            
                                                                              
     We at the NASA/Goddard Space Flight Center (where the CD-ROMs were       
produced and pre-mastered) received Aronsson's errata files well enough in    
advance of actual CD-ROM fabrication to edit some, but by no means all, of the
FITS headers which either contained erroneous keyword values or possessed some
defect in (FITS) structure.  In many instances, it should be pointed out, the 
errors were of a straightforward nature and were incontrovertible.  When a    
correction was made to a header or a table, Aronsson's comment in the relevant
errata file was (at least in most cases) deleted.  Very rarely, if ever, was  
material edited when the "error" was a matter of opinion or conjecture, or was
a "close call":  the original headers (or tables) were allowed to stand and   
Aronsson's comments were preserved.  The attitude was that the archive        
end-user should make up his or her own mind in these (many) instances.        
                                                                              
     Although a great deal of effort in error detection had been expended by  
Mikael Aronsson (through years of receiving and reviewing submissions from the
IHW Discipline Specialists), once the archive was "on-line" on NASA/GSFC's    
mass storage facility (refer to ACKNWLDG.TXT file in root directory), it was  
possible to run the entire corpus of datafiles, headers, tables, etc., through
a series of simple and routine "checks".  These tests had mostly to do with   
file size, FITS structure, uniqueness of internal filenumbers, and so on. We  
detected some additional errors (not seen by Aronsson) during this phase of   
data preparation, and the appropriate corrective measures were taken.         
Additionally, a letter went out from the CD-ROM production team at NASA/GSFC  
to the Discipline Specialist community stating that the archive was on-line,  
and hence the opportunity existed to make final corrections in a reasonably   
small number of files; several of the Discipline Specialists sent us requests 
to make such changes and they were made.                                      
                                                                              
     According to Mikael Aronsson, who produced the so-called "Printed Archive
indices" contained on these CD-ROMs (in the /INDEX/NETABLES directory), as    
well as the two Discipline-specific indices NETRADIO.IDX and NETSPECT.IDX     
(same directory), many of the errors listed in the errata files were corrected
by him in those indices which he produced.  [It should be pointed out that    
many indices on these CD-ROMs, including the "quick look" indices, were       
produced at NASA/GSFC]  What we have, then, is a situation in which the errors
resident in some of the FITS headers and table files may or may not be present
in the relevant Printed Archive indices or Discipline-specific indices.  The  
archive user is simply encouraged to compare the contents of the errata files 
with the appropriate headers, tables, and indices.                            
                                                                              
                                                                              
                                                                              
Malcolm B. Niedner, Jr.                                                       
  IHW Discipline Specialist for Large-Scale Phenomena                         
  NASA/Goddard Space Flight Center                                            
                                                                              
