See http://sbarnhill.mvps.org/WordFAQs/Overbar.htm

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Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
Word MVP FAQ site: http://word.mvps.org
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"puzzled" wrote in message
news
I'd like to combine a letter (C) with a line over indicating that it's an
average value.