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Between 10 and 20 worm cycles, more the better. Like most statistical data, the more samples the better the analysis. Sampling is typically every few seconds. Keep in mind that we are not talking about full frame downloads but a sub frame hence your download speeds will be fast. Experiment with the drift fitting algorithm, don't just accept the default. You may find a better (read tighter) fit with a different algorithm. There is good information in the Pempro manual. Study it and understand frequency waveform fundamentals to get the most from the tool. Finally make sure you measure your results post application of PEC. If all things have gone to plan you should end up with a relatively flat line.
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