By means of the above methods, we will show how QI can be better understood using both QI maps and the phase of individual MOs. First, we revisit the case of benzene, to outline the expectations from conjugated molecules and for comparison with the butane study below. We consider two kinds of connections with the electrodes as shown in Figure . For benzene, we use the Hückel model with nearest neighbour coupling and the value of β is set to be -1. Benzene has six π orbitals with two degenerate pairs of orbitals as the frontier orbitals. Here, we will refer to the frontier orbitals as the HOMO and HOMO ′ and LUMO and LUMO ′ to highlight their degenerate nature and distinguish the non-degenerate HOMO-1 and LUMO+1 orbitals (that in the usual numbering would be the HOMO-2 and LUMO+2). The connection to the electrodes results in a small splitting between the degenerate pairs and influences the energetic ordering of the MOs. For para-substituted benzene, the HOMO and LUMO are the frontier MOs, whereas for meta-substituted benzene, HOMO ′ and LUMO ′ are the frontier MOs. The difference in the electrode positions results in a significant change in the transmission as shown in Figure . More specifically, benzene with meta connection exhibits a sharp dip at E F , whereas that with para connection exhibits a flat curve around E F .