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. 2010 Jun 9;10(6):5872–5887. doi: 10.3390/s100605872

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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 8. — Statistical distribution of signal strength readings versus distance, for tags in front (blue) and behind (red) the traffic signal; and best fits produced with a path-loss model for signal strength.