overline/underline strings

Dear All,

is there a way to realize NCL strings to be underlined, overlined etc.?

For example for Reynolds stress:
____
u'v'

corresponding to $\overline{u'v'}$ in LaTeX notation.

If there is no official support for such string modifications,
workarounds would also be appreciated.

Kind regards,
Marcus Letzel

-- 
Marcus Oliver Letzel  (Dipl.-Met., MSc)
Institute of Meteorology and Climatology
Leibniz University of Hannover
Herrenhaeuser Str. 2
30419 Hannover, Germany
Tel    +49 511 762-4413/-2677
Fax    +49 511 762-4418
Email  letzel_at_muk.uni-hannover.de
http://www.muk.uni-hannover.de/~raasch/PALM_group
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