Hello again, I have simulated a 10 atoms wide zigzag graphene nanoribbon built from the nanoribbon builder and then simulated the (same?) GNR cut from the graphene sheet. The I-V curve of the original GNR is sort of sensible as attached but the I-V curve of the GNR cut from the graphene sheet seems incorrect as attached. When I visualise each structure in the Viewer, they seem the same as you can also see in the attachment. What can cause this difference of their I-V curve being different, or I could ask if the GNR cut from the graphene sheet is not perfectly right for som reason? Cheers, Jim.