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  \item{x}{ A grid grob. }
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  \item{x}{ A grid grob. }
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}
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}
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\details{
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\details{
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  These functions are called in the calculation of
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  These functions are called in the calculation of
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  \code{"grobwidth"} and \code{"grobheight"} units.
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  \code{"grobwidth"} and \code{"grobheight"} units.
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  Methods should be written for classes derived from grob or gTree
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  Methods should be written for classes derived from grob or \I{gTree}
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  where the size of the grob can be determined (see, for example
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  where the size of the grob can be determined (see, for example
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  \code{grid:::widthDetails.frame}).
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  \code{grid:::widthDetails.frame}).
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  The ascent of a grob is the height of the grob by default and
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  The ascent of a grob is the height of the grob by default and
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  the descent of a grob is zero by default, except for text grobs
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  the descent of a grob is zero by default, except for text grobs