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The spatial distribution of ∂FDEP/∂z. (a) The average ∂FDEP/∂z versus two driving (10 kHz and 5 MHz) frequencies, demonstrating attractive FDEP with 10 kHz and repulsive FDEP with 5 MHz. (b) The average ∂FDEP/∂z and FDEP versus the separation distance z. FDEP was obtained by integrating ∂FDEP/∂z.
