Nothing
PLOTplane <-
function(Rp, planecol="brown")
{
if(missing(planecol)) { planecol="brown" }
points(Rp[,1], Rp[,2], pch=21, col='red', bg='yellow')
segments(Rp[1,1],Rp[1,2], Rp[2,1],Rp[2,2], col=planecol)
segments(Rp[2,1],Rp[2,2], Rp[3,1],Rp[3,2], col=planecol)
segments(Rp[3,1],Rp[3,2], Rp[1,1],Rp[1,2], col=planecol)
}
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