Table 2.

Database statistics for 14,053 unique chains

	Minimum	Maximum	Mean	Median	SD	Skewnessa	Kurtosisb
Number of atoms	242	12773	1761	1491	1171	1.94	6.59
Number of residues	50	1610	224	188	149	1.92	6.51
Mean radius (Å)	59	1601	261	228	149	1.92	6.78
Net charge	–76	38	–3.19	–3	7.68	–0.83	4.38
Dipole moment (Debye)	5	5563	543	436	420	3.09	18.29
Charge per atom	–0.038	0.036	–0.001	–0.002	0.006	0.55	4.46
Dipole per atom	0.034	4.53	0.370	0.305	0.285	3.46	24,66

^aThe symmetry of the distribution. The skewness of a normal Gaussian distribution is 0.

^bThe sharpness or flatness of the distribution. The kurtosis of a normal Gaussian distribution is 0.