geom_smooth is a function that provides additional functionality to the standard geom_smooth function in the
event that it is being used on a ggtern object. Parameters are the same, with the exception of the introduction of the limitarea parameter.geom_smooth_tern(mapping = NULL, data = NULL, stat = "SmoothTern",
position = "identity", limitarea = TRUE, fullrange = FALSE, ...)aes or aes_string. Only needs to be set
at the layer level if you are overriding the plot defaults.TRUE,
the value of fullrange has no meaning, since the full-range becomes essentially becomes limited by the ternar