[R] boxplot - margin settings

[Antje]

Hi there,

I'm trying to solve a boxplot problem (should be simple, but I cannot find the 
solution...):

data <- list(	"long_name1_xxxxxxxxxxx" = rnorm(100),
		"long_name2_yyyyyyyyyyyyyy" = rnorm(200))
boxplot(data , las = 2, mar = c(20,4,4,4))

Why does the margin not change whatever I put there???
With other plots it worked for me, why not in this case?
I just want to see the whole label...

I'm really sorry if I've missed a very obvious reason for this behaviour. Maybe 
someone can help me?

Ciao,
Antje