How to create a graph layout?

I all,
I want to create a graph layout in a 3x3 matrix like this:

ylab  |__|  |__|   |__|
       ___  ___   ___
ylab  |__|  |__|   |__|
       ___  ___   ___
ylab  |__|  |__|   |__|
        xl     xl     xl

With this layout, then I'll insert the 9 plots. How ca I create it?

CdeB