Figure 6
From: A smart approach to EMG envelope extraction and powerful denoising for human–machine interfaces

Pearson’s correlation coefficients of noisy and filtered EMG-LE with respect to noiseless EMG-LE. Solid lines refer to the EMG signal corrupted with flat amplitude powerline interference (yellow line) and the related filtered signal (blue line); dashed lines refer to the EMG signal corrupted with amplitude modulated powerline interference (purple line) and the related filtered signal (orange line).