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. 2020 Jul 9;15(7):e0235545. doi: 10.1371/journal.pone.0235545

Fig 4. Medians of standardized sEMG features (RMS and WL) across test periods P0–P4.

Fig 4

Muscle areas: cor = corrugator supercilii, orb = orbicularis oculi, lev = levator labii superioris, zyg = zygomaticus major, and ris = risorius; feature transformations: rms = root mean square, and wl = waveform length.