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  drawing context for a grob or gTree.
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  drawing context for a grob or gTree.
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  \code{makeContent} is called next and is where any additional
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  \code{makeContent} is called next and is where any additional
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  calculations should occur and graphical content should
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  calculations should occur and graphical content should
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  be generated (see, for example,
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  be generated (see, for example,
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  \code{grid:::makeContent.xaxis}.
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  \code{grid:::makeContent.xaxis}).
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  This function should be used to \emph{modify} the \code{children}
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  This function should be used to \emph{modify} the \code{children}
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  of a gTree.
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  of a gTree.
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  The function \emph{must} return the modified \code{x}.
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  The function \emph{must} return the modified \code{x}.
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  Note that the default behaviour
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  Note that the default behaviour
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  for gTrees is to draw all grobs in the \code{children} slot,
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  for gTrees is to draw all grobs in the \code{children} slot,