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(a) Bundlelike nucleus: ordinary symbols are used to denote the dimensions a, b, and l, and the lateral and end surface free energies σ and σe. A density gradient of considerable extent in the l direction will exist at the end surface.
(b) Nucleus with chain folds: bold face symbols are used for the dimensions a, b, and l, and the lateral and end surface free energies σ and σe. Well defined surfaces exist on all faces.
