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+<head>
+<title>UK TeX FAQ -- question label keepfonts</title>
+</head><body>
+<h3>Which font files should be kept</h3>
+<p>Metafont produces from its run three files, a metrics (TFM) file, a
+generic font (GF) file, and a log file; all of these files have the
+same base name as does the input (<em>e.g.</em>, if the input file was
+<i>cmr10.mf</i>, the outputs will be <i>cmr10.tfm</i>,
+<i>cmr10.nnngf</i>
+
+and <i>cmr10.log</i>).
+<p>For TeX to use the font, you need a TFM file, so you need
+to keep that. However, you are likely to generate the same font
+at more than one magnification, and each time you do so you'll
+(incidentally) generate another TFM file; these files are
+all the same, so you only need to keep one of them.
+<p>To preview or to produce printed output, the DVI processor will need a
+font raster file; this is what the GF file provides. However, while
+there used (once upon a time) to be DVI processors that could use
+GF files, modern processors use packed raster (PK) files.
+Therefore, you need to generate a PK file from the GF file; the
+program <i>gftopk</i> does this for you, and once you've done that you
+may throw the GF file away.
+<p>The log file should never need to be used, unless there was some sort
+of problem in the Metafont run, and need not be ordinarily kept.
+<p><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=keepfonts">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=keepfonts</a>
+</body>