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Fig. 2. Weightings for (A) the first principal component (PC I) and (B) the second
principal component (PC II) shown with the proportion of the signal that this
component describes. (C) Intensity spectra reconstructed from the vector
product of the PC loading scores and the PC weightings. The mean frequencies
(MF) for the reconstructed spectra are shown. The angle
is a measure
of the relative PC I and PC II loading scores and of the myoelectric
frequency.