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. Author manuscript; available in PMC: 2006 Jul 19.
Published in final edited form as: Rev Sci Instrum. 2006 Feb;77(2):023702-1–023702-9. doi: 10.1063/1.2166509

FIG. 9.

FIG. 9

Experimentally obtained directional force data. The large black dots indicate pole locations and light grey dots indicate force directions (directions in which the bead was pulled). Axis of symmetry data (a) where forces were applied towards each pole, in between two poles, and in between three poles. (b) shows one octant of pole excitations.