I'm trying to understand how to set graphical parameters for trees created with the party package.  For example take the following code:
 
library(party)
    data(airquality)
    airq <- subset(airquality, !is.na(Ozone))
    airct <- ctree(Ozone ~ ., data = airq, 
                   controls = ctree_control(maxsurrogate = 3))
    plot(airct)
 
My problem is, I've got a ctree that has 14 terminal nodes, and as a result of the default graphical paramters of plot(ctree), all of the text is completely undreadable (decison node text is too large and as a result, these nodes overlap one another, terminal node barplot text overlaps hideously).  What I would like to do is learn how to customize the elements of these plots.  For the text, I have tried par(cex=.4, cex.main=.4, cex.axis=.2, cex.lab=.2)... to no avail.  As far as reducing the size of the node ovals, I'm completely lost there... 
 
Anyone have any suggestions?
 
Thanks in advance!
Chris
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