[R] barplot - x-axis

[Antje]

Hi there,

I have a barplot and the labels at the x-axis are strings, which are 
rotated by 90°. But now the sub-title of the barplot is in between these 
labels, which does not look very nice...
Could anybody help me finding the parameter-setting to prevent this?

par(mai=c(1.5,1,1,0.6))
barplot(data, las=2, ylim = c(0,plotMax+1), ylab = "Percentage", main = 
filename, sub = subtitle)

Thank you!
Antje