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<title>Manipulating Type Size and Vertical Spacing (The GNU Troff Manual)</title>
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<h3 class="section" id="Manipulating-Type-Size-and-Vertical-Spacing-1">5.20 Manipulating Type Size and Vertical Spacing</h3>
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<p>These concepts were introduced in <a class="ref" href="Page-Geometry.html">Page Geometry</a>. The height of a
font’s tallest glyph is one em, which is equal to the type size in
points.<a class="footnote" id="DOCF82" href="groff.html_fot.html#FOOT82"><sup>82</sup></a> A vertical spacing of less than 120% of
the type size can make a document hard to read. Larger proportions can
be useful to spread the text for annotations or proofreader’s marks. By
default, GNU <code class="code">troff</code> uses 10 point type on 12 point
spacing.
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Typographers call the difference between type size and vertical spacing
<em class="dfn">leading</em>.<a class="footnote" id="DOCF83" href="groff.html_fot.html#FOOT83"><sup>83</sup></a>
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<li><a href="Changing-the-Type-Size.html" accesskey="1">Changing the Type Size</a></li>
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