ggplot - line_range help, second tier axis label

Hi All,

Will try and keep brief, excuse the poor graphics skills, first time using
GIMP. I would like to make the first one look (somewhat) like the second if
possible.

From: http://d.imagehost.org/0519/Screen_shot_2010-12-08_at_3_50_23_PM.png
To here:
http://d.imagehost.org/0293/Screen_shot_2010-12-08_at_3_50_23_PM2.png

I imagine the line going over the top with the p-values is probably not
doable? But how about the sort of 'second tier' of labeling on the x axis? I
know there is a legend but I'd like to have the graph without the legend as
I think the second shows things a better than the first. At first I thought
the 'var1var2' variable was redundant, but if I use the var2 alone then the
two A's go first followed by the two B's, so I need that labeling to keep
them in order as far as I can see.

If I can get the second tier of labeling sorted then that will be enough as
I can put the p-values in there worst case.

Was also hoping to have 1A and 1B closer together and 2A and 2B closer so it
looked more like what it is (two groups of two) than it does (one group of
four).

Code to generate the first:

library(ggplot2)
figure4 <- data.frame(cen = c(0.057126,0.040649,0.080966,0.027876), min =
c(0.041141,0.022242,0.057944,0.016731), max =
c(0.079322,0.07429,0.113136,0.046444), var1 = c("1","1","2","2"), var2 =
c("A","B","A","B"), var1var2 = c("1A","1B","2A","2B"))
ggplot(figure4, aes(var1var2, cen, ?ymin = min, ymax=max, linetype=var1)) +
scale_linetype_manual(values = c(1,3)) + geom_pointrange() +
geom_errorbar(width=0.2) + opts(title="Title goes here") + labs(x="Var2",
y="Y units", linetype="Var1")

Thanks
Matt

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