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                    Understanding and optimizing reflow
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                <div><p>You can <dfn class="term">reflow</dfn> a PDF document
to read it on handheld devices, smaller displays, or standard monitors
at large magnifications, without having to scroll horizontally to
read each line. </p>
<p>When you reflow an Adobe PDF document, some content carries into
the reflowed document and some doesn’t. In most cases, only readable
text reflows into the reflowed document. Readable text includes
articles, paragraphs, tables, images, and formatted lists. Text
that doesn’t reflow includes forms, comments, digital signature
fields, and page artifacts, such as page numbers, headers, and footers.
Pages that contain both readable text and form or digital signature
fields don’t reflow. Vertical text reflows horizontally. </p>
<p>As an author, you can optimize your PDF documents for reflow
by tagging them. Tagging ensures that text blocks reflow and that
content follows the appropriate sequences, so readers can follow
a story that spans different pages and columns without other stories
interrupting the flow. The reading order is defined by the structure
tree, which you can change in the Structure pane.</p>
<div class="fignone"><img alt="" id="xc_05" src="images/xc_05.png" /><div class="figdesc">Headings and columns (top) reflow in a logical reading order
(bottom).</div><br /></div></div>

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