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Re: horizontal curly braces.

>by the way, when considering whether to use rules
>for extenders or small pieces, take into account that the rule
>approach yields lengths that exactly match the material being
>braced, while pieces will yield only an approximation. 

In the case of \overbrace and \underbrace you can use leaders to fill
the material precisely, in a similar fashion to \rightarrowfill.  An
appropriate definition would be something like (er, codes off the top
of his head):


This definition works, as long as the uses of \overbrace{foo} are when
foo is wider than the width of
\braceld\braceextd\bracemidd\braceextd\bracerd.  The problem with
extension pieces is when that's not the case...