Figure 6.

Shown are the number of restrained amide–aromatic pairs (that is amide protons and aromatic rings with at least one defined restraint between them) for the four aromatic residue types and three $Z$ score classifications: upfield ( $Z\le -\mathrm{2}$ ), downfield ( $Z\ge \mathrm{2}$ ), and normal ( $-\mathrm{2}\le Z\le \mathrm{2}$ ). The colors of the bars correspond to the number of restraints between the pairs; bar heights are plotted using a logarithmic scale.