An artificial data set consisting of 3000 points in 3 well-separated clusters of size 1000 each.
data(xclara)
A data frame with 3000 observations on 2 numeric variables giving the \(x\) and \(y\) coordinates of the points, respectively.
Anja Struyf, Mia Hubert & Peter J. Rousseeuw (1996) Clustering in an Object-Oriented Environment. Journal of Statistical Software 1. http://www.jstatsoft.org/v01/i04