um distance is determined by testing
 all vertices in the buffer curve, as well
 as midpoints of the curve segments.
 Due to the way buffer curves are constructed, this
 should be a very close approximation.
<P>

<P>
<DL>
<DT><B>Author:</B></DT>
  <DD>mbdavis</DD>
</DL>
<HR>

<P>
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