FIGURE 3.

The depth dependence of the characteristic path length (open symbols) and the clustering coefficient (filled symbols) for proteins of fixed sizes (N = 150: squares, 24 proteins; N = 210: triangles, 15 proteins; N = 310: circles, 15 proteins). The characteristic path length consistently decreases for residues at greater depths; moreover, its value depends on system size. On the other hand, at depths >4 Å, the clustering coefficient attains a fixed value of ∼0.35 irrespective of system size and the location of the residue. Even for the surface residues, the clustering coefficient is independent of system size, although its value is location dependent and somewhat higher than 0.35.