Surface Chart Depth Axis showing all Data Series' on top of each other (Excel 2007)

Hi Everyone,

I'm having trouble getting a Surface Chart to work correctly, I just can't find the way to get the Depth Axis (Z Axis) to scale, it is just showing all data series on a single plane.

Hopefully I have managed to attach the document so you can have a look, I am a Novice when it comes to excel so any help would be greatly appreciated.


Many Thanks,

Jason