In the example shown in , there is command that adds ellipses in the individual map.
habillage = "Label", # color by groups
palette = c("#00AFBB", "#E7B800", "#FC4E07"),
addEllipses = TRUE, ellipse.type = "confidence",
repel = TRUE # Avoid text overlapping
Where can I find more information about what is that ellipse exactly and how that is defined? For example, in the at figure, I don't know why 1VAU which is in red, is not in the red ellipse. Any note about that?