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Sometimes you need to make final tweaks to the appearance of a graph for presentation. You can open PDF and SVG files with the excellent free program Inkscape, or with the commercial program Adobe Illustrator.
Font support can be a problem when you open a PDF file with Inkscape. Normally, point objects drawn with the PDF device will be written as symbols from the Zapf Dingbats font. This can be problematic if you want to open the file in an editor like Illustrator or Inkscape; for example, points may appear as the letter q, as in Figure 14-1, because that is the corresponding letter for a solid bullet in Zapf Dingbats.