Nothing
shadeDens = function(x0, x1, dens, col = "lightgrey", n.points = 200,
lty = 1,...){
xPts = seq(x0, x1, length = n.points)
yPts = dens(xPts,...)
xPts = c(x0, xPts, x1)
yPts = c(0, yPts, 0)
polygon(xPts, yPts, col = col, lty = lty)
}
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