Nothing
error.bars <-
function(x, upper, lower, width = 0.02, ...)
{
xlim <- range(x)
barw <- diff(xlim) * width
segments(x, upper, x, lower, ...)
segments(x - barw, upper, x + barw, upper, ...)
segments(x - barw, lower, x + barw, lower, ...)
range(upper, lower)
}
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