Dear kwant users, Hello everyone, while using Kwant, I noticed that in the tutorials, a square lattice (a=1) is used for building structures. However, in the graphene tutorial, 'kwant.lattice.general' is used, with the following code: -------------- graphene = kwant.lattice.general([[1, 0], [1/2, np.sqrt(3)/2]], # lattice vectors [[0, 0], [0, 1/np.sqrt(3)]]) # Coordinates of the sites a, b = graphene.sublattices --------------- Attached is the image of the graphene lattice. I have found the method for using kwant.lattice.general: kwant.lattice.general(prim_vecs, basis=None, name='', norbs=None) But when it comes to the mentioned graphene, I cannot understand the usage of '’kwant.lattice.general’' The code mentions that the lattice vectors are ‘'[1, 0], [1/2, np.sqrt(3)/2]’', which appears to be a parallelogram. I assume it corresponds to a unit cell. However, the code mentions '’[[0, 0], [0, 1/np.sqrt(3)]]'’ as ‘'Coordinates of the sites'’, and I don't understand which two atoms it corresponds to. Can any scholar help me resolve my doubts? My second question is, when using Kwant, do I need to input the lattice constant? If so, where should it be written? Best wishes. Sincerely, Araya