C-= ?

[Sharon Kimble]

What is the macro/code or whatever that shows the tree of a file, i.e.
an outline of the file showing all its section headings, chapter
headings, etc in a separate buffer above your working buffer, and is
called by "C-=". I did use it very successfully, but I overwrote its key
sequence but now want to re-associate it and use it again. Can you help
please?

Thanks
Sharon.
-- 
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