[R] graphics and 'layout' question

[Arne.Muller at sanofi-aventis.com]

Hello,

I got stuck with a graphics question: I've 3 figures that I present on a single page (window) via 'layout'. The layout is 

layout(matrix(c(1,1,2,3), 2, 2, byrow=TRUE));

so that the frst plot spans the both columns in row one. Now I'd like to magnify the fist figure so that it takes 20% more vertical space (i.e. more space for the y-axis). How would I do this in R?

    thanks a lot for your help,

    Arne