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(A) Differential conductance spectra dI/dV versus sample voltage V. STM feedback was opened at I = 50 pA, V = 2.6 V (black) and V = 2.8 V (red, offset by 0.1 nS for clarity), respectively. (B) Constant-current STM image of the NDI cyclophanes. Tunneling parameters: I = 50 pA, V = 1.8 V.
