I think it would be wise to separate out the source of the elements from errors within them. I would recommend replacing the U with a letter for non-official sources. I am not in favour of replacing spaces by letters, since I use the spaces as an indication that the elements are not corrupt. Rather than introduce a third line, or replacing spaces by letters I append extra items to the right of the standard data. These items include element source, and indications of errors. This method has 2 advantages: (a) The extras are easily removed if anyone needs the original elements. (b) If the elements are extracted by finding the initial '1 ' and '2 ' then the extras accompany the elements. If a third line is used, I recommend starting it with '3 ' so that it is obvious that it belongs with the lines above rather than with the lines below. Mike Waterman ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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