[Kwant] QHE code

Hi Kwanters, I recently come across the file in http://topocondmat.org/w3_pump_QHE/Laughlinargument.html. When I try to run the code and plot pho_xx (which is E_x in the code) against B, I can't get a similar plot with the experimental data. Maybe it's a silly question, but do anyone have any clue? Thanks. Best, Johnny