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Schematic illustration and minimum reduced energy per particle (a) Esheet for a sheet, (b) Etube for a tube and (c) their energy difference ΔE=Etube−Esheet as a function of the number of particles nz and nx parallel and perpendicular to the particle long axis. Energies are given relative to the minimum energy per particle in a dimer. The contour spacing is 0.05 in a and b and 0.02 in c.
