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Figure 3
(a) Example shape descriptors for l = 2. The ratio R2/Rg is plotted against the anisotropic ratio for ellipsoids (black dots) or cylinders (red squares), allowing the identification of prolate or oblate features. (b) Including the use of [\hat{B}_l] as a shape classifier, normalized against [\hat{B}_0], provides further discriminative power between shapes. Small values of [\hat{B}_2] represent approximately spherical particles, while large values represent either prolate or oblate particles. The density in part (b) represents the empirical distribution of [(R_2/R_g, \, \hat{B}_2)] pairs, as obtained from known PDB structures (see Appendix A[link] for details).

IUCrJ
Volume 2| Part 3| March 2015| Pages 309-316
ISSN: 2052-2525
doi:10.1107/S2052252515002535