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Time-averaged, greyscale images of the microswimmers in the control ring (a(i)) and microratchet (a(ii)). The red dots indicate the positions of the saw tooth cliffs. (b) The normalized light intensity of the pixels along the centre circumference of the control ring (blue circles) and the ratchet (red squares) as functions of the angular position. The intensity was normalized with the spatially and temporarily averaged intensity.
