[R] Plot with nested x-labels

[Jim Lemon]

Antje wrote:
> Hi there,
>
> I was wondering wether it is possible to creeate plots with nested 
> lables like in excel?
> If yes, could anyone provide me the information how to do it?
> I've attached an image of an Excel plot to show you, what I'd like to 
> plot with R :-)
>
Hi Antje,
The very question asked by Ofir Levy that led to the new hierobarp 
function in the plotrix package.

Jim