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. Author manuscript; available in PMC: 2021 May 18.
Published in final edited form as: IEEE Trans Neural Syst Rehabil Eng. 2011 Oct 3;19(5):468–476. doi: 10.1109/TNSRE.2011.2166563

Fig. 1.

Fig. 1.

Examples of asymmetric waveforms. PAF was defined as the ratio of the current of the first phase to the current of the second phase. Charge balance was maintained by altering the phase duration of the lowest amplitude phase.