[Kwant] fill command continuum Hamiltonian

Dears, Is it possible to obtain a finite system with three different regions using a discretize continuum Hamiltonian approach? I am using the fill command but I have issues obtaining a finite system, my idea is to have a finite system and fill each part of the system with different Hamiltonian talking about those three regions. I would appreciate if you have any idea to make it, thank in advance Best regards, -- Dr. Jorge Huamaní Correa Professor at Universidad Tecnológica del Perú CTI Vitae : https://ctivitae.concytec.gob.pe/appDirectorioCTI/VerDatosInvestigador.do?id...