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\details{
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\details{
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  This by default makes use of \command{qpdf}, available from
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  This by default makes use of \command{qpdf}, available from
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  \url{http://qpdf.sourceforge.net/} (including as a Windows binary) and
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  \url{http://qpdf.sourceforge.net/} (including as a Windows binary) and
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  included with the CRAN macOS distribution of \R.  If \code{gs_cmd}
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  included with the CRAN macOS distribution of \R.  If \code{gs_cmd}
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  is non-empty and \code{gs_quality != "none"}, GhostScript will used
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  is non-empty and \code{gs_quality != "none"}, GhostScript will used
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  first, then \command{qpdf} if it is available.  If \code{gs_quality !=
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  first, then \command{qpdf} if it is available.  If
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  "none"} and \code{gs_cmd} is \code{""}, an attempt will be made to find a
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  \code{gs_quality != "none"} and \code{gs_cmd} is \code{""}, an attempt
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  GhostScript executable.
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  will be made to find a GhostScript executable.
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  \command{qpdf} and/or \command{gs_cmd} are run on all PDF files found,
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  \command{qpdf} and/or \command{gs_cmd} are run on all PDF files found,
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  and those which are reduced in size by at least 10\% and 10Kb are
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  and those which are reduced in size by at least 10\% and 10Kb are
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  replaced.
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  replaced.
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