Presents the results of cec function in the form of a plot.
Colors of data points depend of the cluster they belong to.
Ellipses are drawn with regards to the covariance (either model or sample) of each cluster.
If this parameter is TRUE, ellipses will be drawn.
model
If this parameter is TRUE, the model (expected) covariance will be used for each cluster insted of sample covariance (MLE) of the points in the cluster, when drawing ellipses.