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A sketch of the annulus light pattern showing the active motors inside the annulus and the inactive motors at the center and in the outer region. The numbers shown are the measured total flux of micromotors from each region to the other over a 71 second time period with a magnetic field applied at a micromotor concentration of around 0.016 per μm2. The diameters of the inner and outer regions of the annulus are approximately 90 μm and 280 μm, respectively.
