[R] Combining lines and barplot

[Dirk Eddelbuettel]

With a data frame containing daily data, I would like to overlay a barplot of
daily outcomes with the daily high and low.  However, when use the
straightforward
	      
	      barplot(X$"day_end", col="gray", ylim=c(0,120))
	      lines(X$"day_high", col="blue")
	      lines(X$"day_low", col="blue")

the lines do not correspond to the same (daily) x-axis values.  How can I
make them do that?  

Thanks,  Dirk

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