NICSSzz and its components perpendicular to the ring allows to provide a more comprehensive understanding of molecular aromaticity. As can be seen from the ∫NICSzz listed in Table , carborazine has a slightly smaller but still quite obvious negative ∫NICSzz value than benzene, while borazine has a much smaller corresponding value, indicating significant and weak aromaticity of carborazine and borazine, respectively. From Figure , it can be seen that the NICSzz curves of the σ electrons of benzene, carborazine, and borazine are almost the same, and the difference in total ∫NICSzz almost entirely comes from the different NICSzz of the π electrons in the three molecules, which is also quantitatively demonstrated by the decomposition of ∫NICSzz.