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3.2.3 Headers and Footers
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Headers and footers occupy the top and bottom of each page,
respectively, and contain data like the page number and the article or
chapter title.  Their appearance is not affected by the running text.
Some packages allow for different titles on even- and odd-numbered pages
(for printed, bound material).

   Headers and footers are together called titles, and comprise three
parts: left-aligned, centered, and right-aligned.  A '%' character
appearing anywhere in a title is automatically replaced by the page
number.  *Note Page Layout::.