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(a) Control measurement using unshaken pellets (top) and the distribution of values obtained by averaging the results of 13 shaking runs using 30 pellets each (bottom). Potential maps of: (b) PE pellets on clean PTFE prior to shaking, (c) pellets shaken for 300 seconds on PTFE and (d) PTFE after removal of PE pellets. Error bars are standard deviations of the average.
