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  The new page is painted with the background colour
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  The new page is painted with the background colour
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  (\code{\link{par}("bg")}), which is often transparent.  For devices
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  (\code{\link{par}("bg")}), which is often transparent.  For devices
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  with a \emph{canvas} colour (the on-screen devices \code{X11},
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  with a \emph{canvas} colour (the on-screen devices \code{X11},
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  \code{windows} and \code{quartz}), the window is first painted with the
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  \code{windows} and \code{quartz}), the window is first painted with the
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  canvas colour and then the background colour.
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  canvas colour and then the background colour.
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  There are two hooks called \code{"before.plot.new"} and
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  There are two hooks called \code{"before.plot.new"} and
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  \code{"plot.new"} (see \code{\link{setHook}}) called immediately
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  \code{"plot.new"} (see \code{\link{setHook}}) called immediately
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  before and after advancing the frame. The latter is used
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  before and after advancing the frame. The latter is used
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  in the testing code to annotate the new page. The hook function(s) are
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  in the testing code to annotate the new page. The hook function(s) are
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  called with no argument.  (If the value is a character string,
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  called with no argument.  (If the value is a character string,