[Gate-users] how to define blocks with different numbers of crystals in different layers

[tstoole]

Hi, 
I am trying to set up a cylindrical pet system with blocks that 
have two layers of crystals. I am relatively new to gate. I have a simulation working when 
the number of crystals in the inner layer and outer layer are the same, 
say both have 10x10 . Now I am trying to modify the system so that the inner 
layer has a 9x9 array of crystals and the outer layer has an array 
of 10x10 crystals. I attempted to do this with a cubicArray but failed. 
Do I need to use genericRepeater? 
 
Does anyone have any hints or suggestions on how to accomplish this? 
Or better yet, is there an example around that does something similar? 
I have been looking through the email archive and online documentation 
and have not found the info yet. 

Thanks for any hints or suggestions, 

Terry