Fig. 6. Histograms of standard deviations of NACs, forcefield polarizabilities, and C₆ dispersion coefficients for first-neighbor-based and second-neighbor-based atom types. Second-neighbor-based atom types included both first and second neighbors. Each standard deviation was computed across different occurrences of the same atom type. The second-neighbor-based atom types showed much smaller standard deviations than the first-neighbor-based atom types.