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  \item{xlim, ylim}{numeric vectors of length 2, giving the x and y
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  \item{xlim, ylim}{numeric vectors of length 2, giving the x and y
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    coordinates ranges.}
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    coordinates ranges.}
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  \item{log}{character; indicating which axes should be in log scale.}
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  \item{log}{character; indicating which axes should be in log scale.}
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  \item{asp}{numeric, giving the \bold{asp}ect ratio y/x,
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  \item{asp}{numeric, giving the \bold{asp}ect ratio y/x,
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    see \sQuote{Details}.}
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    see \sQuote{Details}.}
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  \item{\dots}{further graphical parameters as in \code{\link{par}}.
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  \item{\dots}{further \link{graphical parameters} as in \code{\link{par}}.
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    The relevant ones are \code{xaxs}, \code{yaxs} and \code{lab}.
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    The relevant ones are \code{xaxs}, \code{yaxs} and \code{lab}.
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  }
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  }
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}
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}
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\details{
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\details{
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  \describe{
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  \describe{
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      \code{asp > 1} can be used to produce more accurate maps when using
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      \code{asp > 1} can be used to produce more accurate maps when using
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      latitude and longitude.
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      latitude and longitude.
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  }}
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  }}
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  Note that the coordinate ranges will be extended by 4\% if the
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  Note that the coordinate ranges will be extended by 4\% if the
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  appropriate graphical parameter \code{xaxs} or \code{yaxs} has value
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  appropriate \link{graphical parameter} \code{xaxs} or \code{yaxs} has value
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  \code{"s"} (which is the default).
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  \code{"s"} (which is the default).
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  To reverse an axis, use \code{xlim} or \code{ylim} of the form
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  To reverse an axis, use \code{xlim} or \code{ylim} of the form
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  \code{c(hi, lo)}.
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  \code{c(hi, lo)}.
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  \code{\link{plot}}, \code{\link{hist}}, \code{\link{image}}, \dots,
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  \code{\link{plot}}, \code{\link{hist}}, \code{\link{image}}, \dots,
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  instead and refer to their help pages for explanation of the
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  instead and refer to their help pages for explanation of the
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  arguments.
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  arguments.
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  A side-effect of the call is to set up the \code{usr}, \code{xaxp} and
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  A side-effect of the call is to set up the \code{usr}, \code{xaxp} and
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  \code{yaxp} graphical parameters.  (It is for the latter two that
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  \code{yaxp} \link{graphical parameters}.  (It is for the latter two that
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  \code{lab} is used.)
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  \code{lab} is used.)
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}
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}
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\seealso{
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\seealso{
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  \code{\link{xy.coords}},
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  \code{\link{xy.coords}},
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  \code{\link{plot.xy}},
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  \code{\link{plot.xy}},