[Kwant] Computation time scaling for dimensions other than two?

[xiaoxiao . zhang]

Hello Kwant Community,
In the 2014 kwant paper New J. Phys. 16 063065, Fig. 6 gives the conductance 
computation time scaling for 2D systems of side length L:
O(L^2) for construction, O(L^3) for solving with the MUMPS-based solver, and 
O(L^4) for solving with RGF.
I was wondering what the general scaling is for other dimensions. I presume it 
is known to experts and might be helpful to many users.
Thank you.