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Tunneling-voltage-dependent contrast of the experimental STM images (a, b) compared to the simulated STM images (c, d). Each image comprises a close-up inset for a direct comparison of features associated with PTCDA and K. The unit cell of the adsorbate layer (blue boxes) comprising the structural model is superimposed in a semitransparent manner. Explanations of the displayed quantities are identical to those of Figure 2.
