All, I have put together some suggestions to extend the number formatting capability in \unit, particularly for scientific and engineering purposes, including basic support for tolerances and uncertainties.
It is a bit long, so source is attached and a PDF is at http://dl.dropbox.com/u/36891398/units6.pdf Of course, this is just my opinion, so I welcome any feedback from the list. Best, Robin
units6.tex
Description: units6.tex
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