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\title{Draw an X-Axis on a Grid Viewport}
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\title{Draw an X-Axis on a Grid Viewport}
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\description{
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\description{
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  This function draws an x-axis.
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  This function draws an x-axis.
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}
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}
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\usage{
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\usage{
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grid.xaxis(at = NA, label = TRUE, main = TRUE, gp = gpar(),
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grid.xaxis(at = NULL, label = TRUE, main = TRUE, gp = gpar(),
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           draw = TRUE, vp = NULL)
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           draw = TRUE, vp = NULL)
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}
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}
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\arguments{
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\arguments{
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  \item{at}{A numeric vector of x-value locations for the tick marks.}
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  \item{at}{A numeric vector of x-value locations for the tick marks.}
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  \item{label}{A logical value indicating whether to draw the labels
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  \item{label}{A logical value indicating whether to draw the labels