\item{x2}{a numeric vector giving the coordinates of the observations
on the \emph{y}-axis. Both \code{x1} and \code{x2} must be specified
to be used.}
- \item{...}{further arguments to be passed to \code{plot()}.}
+ \item{\dots}{further arguments to be passed to \code{plot()}.}
}
\description{
The function \code{mst} finds the minimum spanning tree between a set of