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    are equally spaced, and \code{zlim[1]} and \code{zlim[2]} were taken
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    are equally spaced, and \code{zlim[1]} and \code{zlim[2]} were taken
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    to be midpoints. (This was the default prior to \R 1.1.0.)
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    to be midpoints. (This was the default prior to \R 1.1.0.)
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    The current default is to have colour intervals of equal lengths
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    The current default is to have colour intervals of equal lengths
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    between the limits.}
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    between the limits.}
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  \item{\dots}{graphical parameters for \code{\link{plot}} may also be
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  \item{\dots}{graphical parameters for \code{\link{plot}} may also be
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    passed as arguments to this function.}
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    passed as arguments to this function, as can the plot aspect ratio
- 
 
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    \code{asp} (see \code{\link{plot.window}}).}
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}
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}
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\description{
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\description{
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  Creates a grid of colored or gray-scale rectangles with colors
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  Creates a grid of colored or gray-scale rectangles with colors
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  corresponding to the values in \code{z}.  This can be used to display
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  corresponding to the values in \code{z}.  This can be used to display
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  three-dimensional or spatial data aka \dQuote{images}.
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  three-dimensional or spatial data aka \dQuote{images}.