ggtern are instigated via the default
constructor: ggtern(...), which is essentially a
convenience wrapper for the following: ggplot{...} +
coord_tern(), indeed, if one wishes to use
ggplot{...} + coord_tern() then this is quite
satisfactory.ggtern(data = NULL, ...)ggtern(...) returns an object of class
ggplot.ggtern package,
(including many examples), click
HERE.