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(A) Fourier transformation of the time-dependent PHE readout signal taken from 100 nL droplet sequences prepared at the same flow ratio of ferrofluid to oil of 1:1 and varied flow rate from 1 to 20 mL/h. (B) Close-up of the response signal appearance of one droplet for different droplet volumes. (C) Stray field calculation of two droplets with the volume of 70 and 100 nL. The droplets are biased in the geomagnetic field.
