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This article is copyrighted as indicated in the article. Reuse of AAPT content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 130.160.4.77 On: Fri, 19 Dec 2014 21:22:08
This article is copyrighted as indicated in the article. Reuse of AAPT content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 130.160.4.77 On: Fri, 19 Dec 2014 21:22:08
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