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. 2017 Aug 2;17(8):1776. doi: 10.3390/s17081776

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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VPG signal (Y-component) obtained by averaging the signals of all of the ROIs (F, C, N or, rather, ROI T (Total)) over one test execution. The signal is represented in the time domain (a) and in the frequency domain (b), after the bandpass filtering process.

VPG signal (Y-component) obtained by averaging the signals of all of the ROIs (F, C, N or, rather, ROI T (Total)) over one test execution. The signal is represented in the time domain (a) and in the frequency domain (b), after the bandpass filtering process.