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Time-frequency spectrograms using CWT of the first 10 s CF vGRF signals of CO, PD Stage 2, PD Stage 2.5, and PD Stage 3 subjects in a 10 s time window size from Ga [21] dataset: (a) original vGRF signal, (b) 0.1–5 Hz time-frequency spectrogram, and (c) 5–50 Hz time-frequency spectrogram.
