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. 2011 May 4;11(5):4899–4916. doi: 10.3390/s110504899

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© 2011 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 3. — Classification tree of the dataset obtained without thermal desorption. Results from other analytical protocols (thermal desorption pre-treatment at four different temperatures) were similar and are omitted for clarity.