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  Two-dimensional splines need to be created in an isotropic coordinate
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  Two-dimensional splines need to be created in an isotropic coordinate
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  system.  Device coordinates are used (with an anisotropy correction if
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  system.  Device coordinates are used (with an anisotropy correction if
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  needed.)
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  needed.)
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}
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}
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\references{
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\references{
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  Blanc, C. and Schlick, C. (1995),
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  \bibshow{R:Blanc+Schlick:1995}
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  \emph{X-splines : A Spline Model Designed for the End User},
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  in \emph{Proceedings of SIGGRAPH 95}, pp.\sspace{}377--386.
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  \url{https://dept-info.labri.fr/~schlick/DOC/sig1.html}
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}
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}
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\seealso{
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\seealso{
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  \code{\link{polygon}}.
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  \code{\link{polygon}}.
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  \code{\link{par}} for how to specify colors.
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  \code{\link{par}} for how to specify colors.