Hi devs,

I am learning kwant alone, but I have doubts. I have several confusions which 
are related to calculate transport by using kwant:

1. When disorder is included what the number of iterations or what is the 
convergence standard in calculation ?
2. Will the length of scattering region affect computed result ?For example, I 
construct the system with scattering region and two leads, will the length of 
scattering region affect the transport properties? If the length of scattering 
region is too small, is there any interaction between two leads? If transport 
properties depend on the length of scattering region, what we should consider 
it?  What calculations can illustrate the influence of the length of scattering 
region?

what is the best solution or if you can give me some advices to solve that 
problem I will appreciate it, thanks a lot! 

Best regards

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