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. 2014 Nov 14;14(11):21588–21602. doi: 10.3390/s141121588

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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. — Spatial distributions of feature vectors for different tool wear categories. (a) The first and fifth harmonic feature; (b) The eleventh and thirteenth harmonic feature.