## The function is currently defined as
function(lcol = "darkgrey", lty = 2)
{
lx = 2 / sqrt(3)
lines(c(lx / 4, lx), c(1 / 2, 0),
lty = lty, col = lcol)
lines(c(3 * lx / 4, 0), c(1 / 2, 0),
lty = lty, col = lcol)
lines(c(lx / 2, lx / 2), c(0, 1),
lty = lty, col = lcol)
}
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