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  \code{\link{plot}},
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  \code{\link{plot}},
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  and the workhorse function \code{\link{plot.xy}}.
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  and the workhorse function \code{\link{plot.xy}}.
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  \code{\link{abline}} for drawing (single) straight lines.
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  \code{\link{abline}} for drawing (single) straight lines.
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  \code{\link{par}} for how to specify colors.
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  \code{\link{par}} for line type (\code{lty}) specification and how to
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  specify colors.
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}
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}
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\examples{
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\examples{
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# draw a smooth line through a scatter plot
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# draw a smooth line through a scatter plot
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plot(cars, main = "Stopping Distance versus Speed")
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plot(cars, main = "Stopping Distance versus Speed")
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lines(stats::lowess(cars))
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lines(stats::lowess(cars))