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. 2014 Aug 12;14(8):14732–14743. doi: 10.3390/s140814732

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 6. — Signals acquired at different walking speeds: (a) 4 km/h; (b) 5 km/h; (c) 6 km/h; (d) 7 km/h (top: proposed system, bottom: reference system).