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+<head>
+<title>UK TeX FAQ -- question label tfm</title>
+</head><body>
+<h3>What are TFM files?</h3>
+<p/>TFM stands for TeX Font Metrics; TFM files hold
+information about the sizes of the characters of the font in question,
+and about ligatures and kerns within that font. One TFM file is
+needed for each font used by TeX, that is for each design (point)
+size for each weight for each family; each TFM file serves for all
+magnifications of &lsquo;its&rsquo; font, so that there are (typically) fewer
+TFM files than there are PK files. TeX (LaTeX, etc.)
+itself needs only to know about the sizes of characters and their
+interactions with each other, but not what characters look like. By
+contrast, TFM files are not, in principle, needed by the
+DVI driver, which only needs to know about the glyphs that each
+character selects, so as to print or display them.
+<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=tfm">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=tfm</a>
+</body>