Solved by ptrblck in post #5 
              
              
                Thanks for the code! I created a small example script to show the difference between the 2D and 3D case. 
I think it’s due to the different variance, since you have to divide by a larger number of elements in the 3D case. 
The code is a bit ugly, but I think it will explain the effects: 
# Init Batc…