[R] layout question

[Bill Simpson]

I wanted to produce a layout like this:

      |----------|
      |          |
      |    1     | 
      |          |
|-----------------------|
|           |           |  
|     2     |    3      |   
|           |           |  
|-----------------------|
Three equal sized plots with the top one centred about the other two.

So far I am using
nf<-layout(matrix(c(1,1,2,3), 2, 2, byrow=TRUE),respect=TRUE)
which produces a layout like this:

|-----------------------|
|                       |
|          1            |
|                       |
|-----------------------|
|           |           |
|     2     |    3      |
|           |           |
|-----------------------|

The top plot is stretched horizontally.

Is there a way to get what I want with layout or by some other means?
Thanks for any help.

Bill

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