##' @param xy Instance of \code{data.frame}, \code{SpatialPoints},
##' \code{SpatialPointsDataFrame} or \code{RhrMappedData}. If \code{xy} is
##' is a \code{data.frame}, then the first two columns are assumed to be the
##' \code{x} and \code{y} coordinates of the relocations.
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