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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/).
Comparison of the magnitude of a tri-accelerometer among three different activities. The accelerometer has sensor readings from three axes, i.e., x-axis, y-axis, and z-axis. (a) Comparison of walking and standing; (b) Comparison of standing and sitting.