[R] Plotting barplot and scatterplot on same device - x-axis problem

[Thomas Pedersen]

Hi R-users

I'm a relative newbie and uses R mostly for graphical purpose. I have a
layout problem when plotting a scatterplot and a barplot using
par(new=TRUE). The baseline of the x-axis is not positioned equal for the
two plotting functions (see picture) and I have been unable to find out how
this is changed. 

http://www.nabble.com/file/p18025066/pic.jpeg 

I have added the script if this is of interrest:

par(mar = c(7, 4, 4, 2) + 0.1)

barplot(rbind(data$Asn,data$Glu,data$NH3),
 beside=T,
 axes=TRUE,
 xlim=c(0,57),
 ylim=c(0,10))

par(new=TRUE)

plot(1:14,data$Acidification.time,
 axes=FALSE,
 type="b",
 xlab="",
 ylab="",
 xlim=c(0.3,14.7),
 ylim=c(6,8))

axis(1,pos=6,
 labels=FALSE,
 at=c(0.3,1:14,14.7))

text(1:14, par("usr")[3], srt = 90, adj = 1,
 labels = data$Month, xpd = TRUE)

axis(4,pos=14.7)

All help will be greatly appreciated
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