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. 2010 Jul 13;10(7):6773–6787. doi: 10.3390/s100706773

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© 2010 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 9. — Reflection spectra obtained for DPFs with different soot loadings as indicated. DPF volume: 2.3 liter. Please note: in contrast to Figure 7, |S₁₁| is given in dB. Slightly modified after [43], reprinted with permission from Institute of Physics and IOP Publishing 2010.