[Kwant] Question about lead_info[].wave_functions[]

Hi all, I have a question regarding the lead_info[x].wave_functions[x]. I am not sure what this is actually returning? I tried to run the function on your quantum_wire_revisited.py-system, like this prop = sm.lead_info[0] print(prop.wave_functions[0]) with W = 2, if that is important. It then returns a 1x2 array or 2x2 matrix depending on the energy. What does this matrix contain? I read about propagatingmodes in the documentation, but I am not sure what it meant. Best, Camilla