How to fill colors correctly using geom_polygon in ggtern?

Question

Here is the code which I am using to create boundaries in my ternary diagram:

library(ggtern)
DATA <- data.frame(x = c(0,0,0.04),
               y = c(1,0         


        

Answer 1

Have you tried geom_polygon(aes(fill=col), alpha=0.5) ?