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-<head>
-<title>UK TeX FAQ -- question label overfull</title>
-</head><body>
-<h3>(La)TeX makes overfull lines</h3>
-<p/>When TeX is building a paragraph, it can make several attempts to
-get the line-breaking right; on each attempt it runs the same
-algorithm, but gives it different parameters. You can affect the way
-TeX&rsquo;s line breaking works by adjusting the parameters: this answer
-deals with the &ldquo;tolerance&rdquo; and stretchability parameters. The other
-vital &lsquo;parameter&rsquo; is the set of hyphenations to be applied: see
-&ldquo;<a href="FAQ-nohyph.html">my words aren&rsquo;t being hyphenated</a>&rdquo;
-(and the questions it references) for advice.
-<p/>If you&rsquo;re getting an undesired &ldquo;overfull box&rdquo;, what has happened is
-that TeX has given up: the parameters you gave it don&rsquo;t allow it to
-produce a result that <em>doesn&rsquo;t</em> overfill. In this circumstance,
-Knuth decided the best thing to do was to produce a warning, and to
-allow the user to solve the problem. (The alternative, silently to go
-beyond the envelope of &ldquo;good taste&rdquo; defined for this run of TeX,
-would be distasteful to any discerning typographer.) The user can
-almost always address the problem by rewriting the text that&rsquo;s
-provoking the problem &mdash; but that&rsquo;s not always possible, and in some
-cases it&rsquo;s impossible to solve the problem without adjusting the
-parameters. This answer discusses the approaches one might take to
-resolution of the problem, on the assumption that you&rsquo;ve got the
-hyphenation correct.
-<p/>The simplest case is where a &lsquo;small&rsquo; word fails to break at the end of
-a line; pushing the entire word to a new line isn&rsquo;t going to make much
-difference, but it might make things just bad enough that TeX won&rsquo;t
-do it by default. In such a case on can <em>try</em> the LaTeX
-<code>\</code><code>linebreak</code> command: it may solve the problem, and if it does, it
-will save an awful lot of fiddling. Otherwise, one needs to adjust
-parameters: to do that we need to recap the details of TeX&rsquo;s line
-breaking mechanisms.
-<p/>TeX&rsquo;s first attempt at breaking lines is performed without even
-trying hyphenation: TeX sets its &ldquo;tolerance&rdquo; of line breaking
-oddities to the internal value <code>\</code><code>pretolerance</code>, and sees what
-happens. If it can&rsquo;t get an acceptable break, TeX adds the
-hyphenation points allowed by the current patterns, and tries again
-using the internal <code>\</code><code>tolerance</code> value. If this pass also fails, and
-the internal <code>\</code><code>emergencystretch</code> value is positive, TeX will try
-a pass that allows <code>\</code><code>emergencystretch</code> worth of extra stretchability
-to the spaces in each line.
-<p/>In principle, therefore, there are three parameters (other than
-hyphenation) that you can change: <code>\</code><code>pretolerance</code>, <code>\</code><code>tolerance</code>
-and <code>\</code><code>emergencystretch</code>. Both the <code>tolerance</code> values are
-simple numbers, and should be set by TeX primitive count
-assignment &mdash; for example
-<blockquote>
-<pre>
-\pretolerance=150
-</pre>
-</blockquote><p>
-For both, an &ldquo;infinite&rdquo; tolerance is represented by the value
-<code>10</code><code>000</code>, but infinite tolerance is rarely
-appropriate, since it can lead to very bad line breaks indeed.
-<p/><code>\</code><code>emergencystretch</code> is a TeX-internal &lsquo;dimen&rsquo; register, and can
-be set as normal for dimens in Plain TeX; in LaTeX, use
-<code>\</code><code>setlength</code> &mdash; for example:
-<blockquote>
-<pre>
-\setlength{\emergencystretch}{3em}
-</pre>
-</blockquote><p>
-<p/>The choice of method has time implications &mdash; each of the
-passes takes time, so adding a pass (by changing
-<code>\</code><code>emergencystretch</code>) is less desirable than suppressing one (by
-changing <code>\</code><code>pretolerance</code>). However, it&rsquo;s unusual nowadays to find a
-computer that&rsquo;s slow enough that the extra passes are really
-troublesome.
-<p/>In practice, <code>\</code><code>pretolerance</code> is rarely used other than to manipulate
-the use of hyphenation; Plain TeX and LaTeX both set its value
-to <code>100</code>. To suppress the first scan of paragraphs, set
-<code>\</code><code>pretolerance</code> to <code>-1</code>.
-<p/><code>\</code><code>tolerance</code> is often a good method for adjusting spacing;
-Plain TeX and LaTeX both set its value to <code>200</code>. LaTeX&rsquo;s
-<code>\</code><code>sloppy</code> command sets it to <code>9999</code>, as does the
-<code>sloppypar</code> environment. This value is the largest
-available, this side of infinity, and can allow pretty poor-looking
-breaks (this author rarely uses <code>\</code><code>sloppy</code> &ldquo;bare&rdquo;, though he does
-occasionally use <code>sloppypar</code> &mdash; that way, the change of
-<code>\</code><code>tolerance</code> is confined to the environment). More satisfactory is
-to make small changes to <code>\</code><code>tolerance</code>, incrementally, and then to look to
-see how the change affects the result; very small increases can often
-do what&rsquo;s necessary. Remember that <code>\</code><code>tolerance</code> is a paragraph
-parameter, so you need to ensure it&rsquo;s actually applied &mdash; see
-&ldquo;<a href="FAQ-paraparam.html">ignoring paragraph parameters</a>&rdquo;.
-LaTeX users could use an environment like:
-<blockquote>
-<pre>
-\newenvironment{tolerant}[1]{%
- \par\tolerance=#1\relax
-}{%
- \par
-}
-</pre>
-</blockquote><p>
-enclosing entire paragraphs (or set of paragraphs) in it.
-<p/>The value of <code>\</code><code>emergencystretch</code> is added to the assumed
-stretchability of each line of a paragraph, in a further run of the
-paragraph formatter in case that the paragraph can&rsquo;t be made to look
-right any other way. (The extra scan happens if
-<code>\</code><code>emergencystretch&gt;0pt</code> &mdash; if it&rsquo;s zero or negative, no gain
-could be had from rerunning the paragraph setter.) The example above
-set it to <code>3em</code>; the Computer Modern fonts ordinarily fit three
-space skips to the <code>em</code>, so the change would allow anything up
-to the equivalent of nine extra spaces in each line. In a line with
-lots of spaces, this could be reasonable, but with (say) only three
-spaces on the line, each could stretch to four times its natural
-width. It is therefore clear that <code>\</code><code>emergencystretch</code> needs to be
-treated with a degree of caution.
-<p/>More subtle (but more tricky to manage) are the microtypographic
-extensions provided by PDFTeX. Since PDFTeX is the default
-&lsquo;engine&rsquo; for LaTeX and ConTeXt work in all distributions,
-nowadays, the extensions are available to all. There are two
-extensions, margin kerning and font expansion; margin kerning only
-affects the visual effect of the typeset page, and has little effect
-on the ability of the paragraph setter to &ldquo;get things right&rdquo;.
-Font expansion works like a subtler version of the trick that
-<code>\</code><code>emergencystretch</code> plays: PDFTeX &lsquo;knows&rsquo; that your current font
-may be stretched (or shrunk) to a certain extent, and will do that
-&ldquo;on the fly&rdquo; to optimise the setting of a paragraph. This is a
-powerful tool in the armoury of the typesetter.
-<p/>As mentioned above, the microtypographic extensions are tricky beasts
-to control; however, the <i>microtype</i> package relieves the user
-of the tedious work of specifying how to perform margin adjustments
-and how much to scale each font ... for the fonts the package
-knows about; it&rsquo;s a good tool, and users who can take on the
-specification of adjustments for yet more fonts are always welcome.
-<dl>
-<dt><tt><i>microtype.sty</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/microtype.zip">macros/latex/contrib/microtype</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/microtype.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/microtype/">browse</a>)
-</dl>
-<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=overfull">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=overfull</a>
-</body>