triplot() # empty plot
tripoints(0.1, 0.2, 0.7) # a point
tripoints(c(0.2, 0.6), c(0.3, 0.3), c(0.5, 0.1),
pch = c(2, 6)) # two points
trilines(c(0.1, 0.6), c(0.2, 0.3), c(0.7, 0.1),
col = "blue", lty = "dotted") # a line
trilines(centerlines(3))
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