Label in oblique orientation

Hi, 
I drew a barplot with this code:

BarSize<-barplot(Size$SumArea,names.arg=Size$Class)

However the name of each bar is long. Thus, some names do not appear. I want
to write labels with Oblique orientation. 
Can you help me to do that? 
Thank you in advance.


--
View this message in context: http://r.789695.n4.nabble.com/Label-in-oblique-orientation-tp4211944p4211944.html
Sent from the R help mailing list archive at Nabble.com.