eV "bulk" peak) survives the elimination (total and partial) of the empty (non-aromatic) end-rings which generates the edge modified AGNRs (without end states, and ΔEzz). As is well known, this "bulk" peak value, decreases as the length of the AGNR increases. For the 4x13 AGNR we find ΔEac =1.6 eV, but for the longer 4x18 (9, 36), and 4x24 (9, 48) AGNRs of lengths L ≈ 78Å, and L≈104 Å respectively, we obtain (by TDDFT) for both of them ΔEac = 1.45 eV. This value is in very good agreement with the recently measured gap of 1.4 eV by Talirz et al. , as is illustrated in Fig. . The peak at 1.45 eV is further verified by Fig. which shows the spectrum of the edge-modified 4x24 AGNR. We can also clearly see in Figs. S3(b), S3(c) the "surface" ΔEzz gap at about 2.1-2.2 eV.