Dear all,
Is there a simple way to add reference lines in background? I am trying with
abline() or grid() but the lines, since they are executed after the plot
function, are draw on top. How can I draw such lines beneath the main plot?
Here is an example:
x<-rnorm(100)
boxplot(x)
abline(h=c(-1,0,1))
grid(NA, 4, lwd = 2)
regards,
Luigi Marongiu, MSc
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