A horribly pedestrian alternative to plotrix:
barplot(x,beside=TRUE, ylim=c(0,90), etc.)
par('usr') # just getting plot limits
[1] 0.44 15.56 0.00 90.00
par(new=T)
lines(c(0.44,15.56),c(20,20))
lines(c(0.44,15.56),c(40,40))
etc.
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