[R] Plot window - save as Postscript question

[Knut Krueger]

R  2.4.0 for Windows
The following plot appears as a squared window (as all r-plots)
Not all subtitles are visible, but  all subtitle will appear, when  
changing the aspect ratio of the plot window with the mouse to a wide 
format.
But does not work when using the save as postscript menu item from the 
plot window.
is there any solution for that?

opar <- par(mfrow = c(2,2), oma = c(0, 0, 1.1, 0))
mp <- barplot2(VADeaths) # default
mp <- barplot2(VADeaths) # default
mp <- barplot2(VADeaths) # default
mp <- barplot2(VADeaths) # default
par(opar)

Regards Knut