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. 2014 Feb 19;14(2):3408–3427. doi: 10.3390/s140203408

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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 12. — Internal PD. (a) PR map of the signals measured with the HFCT, (b) Normalized average spectral power of the signals measured with the HFCT, (c) PR map of the signals measured with the ILS, (d) Normalized average spectral power from the signals measured with the ILS.