Extended Data Fig. 5: Comparison of bond-resolved STM measurements conducted with CO-functionalized and spontaneously functionalized STM tips.

a, Bond-resolved STM image of 7/9-AGNR, obtained with a tip that was spontaneously functionalized via an unknown molecule from the surface (Vs = 0.02 V, It = 80 pA, f = 581 Hz, Vac = 12 mV). b, Bond-resolved STM image of 7/9-AGNR, obtained with a tip deliberately functionalized with CO (Vs = 0.02 V, It = 180 pA, f = 581 Hz, Vac = 12 mV).