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Fig. 3. Distribution of the HOMO–LUMO orbitals and the main transmission channel in the pX2 chain as represented in Fig. 1 with n = 5 (A) n = 6 (B) and n = 12 (C). The isosurface values were 2.5 × 10−2 for the HOMO–LUMO orbitals and 2.5 × 10−3 for the transmission channels. (A) Taken from ref. 16.