Grid package: how to customize cell spacing?

Sat, Sep 8, 2012 7:21 AM

Hello,

I am using the recipe below to place plots side by side: 
http://wiki.stdout.org/rcookbook/Graphs/Multiple%20graphs%20on%20one%20page%20%28ggplot2%29/

How can I reduce or customize the horizontal spacing between the grid cells? I have researched the Grid package but can't find the way to do so.

TIA,
Best regards,
Giovanni