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Geometry of the problem (dimensions are in μm) (A) horizontal toroid in a U-shaped barrier; (B) vertical toroid in a U-shaped barrie; (C) spheroid in a U-shaped barrie; (D) toroi; (E) spheroi; (F) horizontal toroid in a microwel; (G) vertical toroid in a microwell and (H) spheroid in a microwell.
