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  \code{\link{postscript}} device, and post-processing the output file
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  \code{\link{postscript}} device, and post-processing the output file
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  using \code{ghostscript}.  \code{bitmap} works in the same way using a
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  using \code{ghostscript}.  \code{bitmap} works in the same way using a
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  \code{postscript} device and postprocessing the output as
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  \code{postscript} device and postprocessing the output as
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  \dQuote{printing}.
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  \dQuote{printing}.
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  You will need a recent version of \code{ghostscript} (5.10 and
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  You will need a version of \code{ghostscript} (5.10 and
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  later have been tested): the full path to the executable can be set by
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  later have been tested): the full path to the executable can be set by
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  the environment variable \env{R\_GSCMD}.
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  the environment variable \env{R\_GSCMD}.
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  The types available will depend on the version of \code{ghostscript},
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  The types available will depend on the version of \code{ghostscript},
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  but are likely to include
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  but are likely to include
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  \code{"jpeggray"}, \code{"pdfwrite"}.
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  \code{"jpeggray"}, \code{"pdfwrite"}.
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  Note: despite the name of the functions they can produce PDF \emph{via}
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  Note: despite the name of the functions they can produce PDF \emph{via}
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  \code{type = "pdfwrite"}, and the PDF produced is not bitmapped.
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  \code{type = "pdfwrite"}, and the PDF produced is not bitmapped.
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- 
 
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  For formats which contain a single image, a file specification like
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  \code{Rplots\%03d.png} can be used: this is intepreted by GhostScript.
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  For \code{dev2bitmap} if just one of \code{width} and \code{height} is
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  For \code{dev2bitmap} if just one of \code{width} and \code{height} is
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  specified, the other is chosen to preserve aspect ratio of the
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  specified, the other is chosen to preserve aspect ratio of the
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  device being copied.
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  device being copied.
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}
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}
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\value{
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\value{