REVIEW Another format supported is XFIG. Such output is editable with the xfig graphics editor, allowing further annotations and modifications to be made to the automatically generated plot. The XFIG graphics can then be converted to an even larger collection of graphics formats, including PDF. For the graphics actually presented here in the book R has been used, in fact, to generate XFIG output which is then converted to PDF. Thus the code examples here, generating PDF directly, may give slightly different layouts to the figures that actually appear here.
A highly interoperable approach is to generate graphs in FIG format which can then be loaded into the xfig application, for example, for further editing. This allows, for example, minor changes to be made to fine tune the graphics, but at the cost of losing the ability to automatically regenerate the plot from the original R code. For LaTeX processing the rubber package (under Debian GNU/Linux) will automatically convert them to the appropriate EPS or PDF format. Of course, xfig can also generate PNG and JPG and many other formats.
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