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<a name="Overfull-hboxes"></a>
<div class="header">
<p>
Next: <a href="_0040smallbook.html#g_t_0040smallbook" accesskey="n" rel="next"><code>@smallbook</code></a>, Previous: <a href="Preparing-for-TeX.html#Preparing-for-TeX" accesskey="p" rel="prev">Preparing for TeX</a>, Up: <a href="Hardcopy.html#Hardcopy" accesskey="u" rel="up">Hardcopy</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html#Command-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Overfull-_0060_0060hboxes_0027_0027"></a>
<h3 class="section">19.10 Overfull &ldquo;hboxes&rdquo;</h3>
<a name="index-Overfull-hboxes"></a>
<a name="index-hbox_002c-overfull"></a>
<a name="index-Final-output"></a>

<p>TeX is sometimes unable to typeset a line within the normal
margins.  This most often occurs when TeX comes upon what it
interprets as a long word that it cannot hyphenate, such as an
electronic mail network address or a very long identifier.  When this
happens, TeX prints an error message like this:
</p>
<div class="example">
<pre class="example">Overfull @hbox (20.76302pt too wide)
</pre></div>

<a name="index-hbox"></a>
<p>(In TeX, lines are in &ldquo;horizontal boxes&rdquo;, hence the term, &ldquo;hbox&rdquo;.
&lsquo;<samp>@hbox</samp>&rsquo; is a TeX primitive not used in the Texinfo language.)
</p>
<p>TeX also provides the line number in the Texinfo source file and
the text of the offending line, which is marked at all the places that
TeX considered hyphenation.  See <a href="Debugging-with-TeX.html#Debugging-with-TeX">Debugging with TeX</a>, for more
information about typesetting errors.
</p>
<p>If the Texinfo file has an overfull hbox, you can rewrite the sentence
so the overfull hbox does not occur, or you can decide to leave it.  A
small excursion into the right margin often does not matter and may not
even be noticeable.
</p>
<p>If you have many overfull boxes and/or an antipathy to rewriting, you
can coerce TeX into greatly increasing the allowable interword
spacing, thus (if you&rsquo;re lucky) avoiding many of the bad line breaks,
like this:
</p>
<a name="index-_005cemergencystretch"></a>
<div class="example">
<pre class="example">@tex
\global\emergencystretch = .9\hsize
@end tex
</pre></div>

<p>(You should adjust the fraction as needed.)  This huge value for
<code>\emergencystretch</code> cannot be the default, since then the typeset
output would generally be of noticeably lower quality; its default
value is &lsquo;<samp>.15\hsize</samp>&rsquo;.  <code>\hsize</code> is the TeX dimension
containing the current line width.
</p>
<a name="index-Black-rectangle-in-hardcopy"></a>
<a name="index-Rectangle_002c-black-in-hardcopy"></a>
<a name="index-Box_002c-ugly-black-in-hardcopy"></a>
<a name="index-Ugly-black-rectangles-in-hardcopy"></a>
<p>For any overfull boxes you do have, TeX will print a large, ugly,
black rectangle beside the line that contains the overfull hbox unless
told otherwise.  This is so you will notice the location of the
problem if you are correcting a draft.
</p>
<a name="index-finalout"></a>
<p>To prevent such a monstrosity from marring your final printout, write
the following in the beginning of the Texinfo file on a line of its own,
before the <code>@titlepage</code> command:
</p>
<div class="example">
<pre class="example">@finalout
</pre></div>


<hr>
<div class="header">
<p>
Next: <a href="_0040smallbook.html#g_t_0040smallbook" accesskey="n" rel="next"><code>@smallbook</code></a>, Previous: <a href="Preparing-for-TeX.html#Preparing-for-TeX" accesskey="p" rel="prev">Preparing for TeX</a>, Up: <a href="Hardcopy.html#Hardcopy" accesskey="u" rel="up">Hardcopy</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Command-and-Variable-Index.html#Command-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
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