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. 2011 Aug 2;11(8):7644–7655. doi: 10.3390/s110807644

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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 5. — Alignment configuration for parallelism of two couterpropagating beams. IN: interferometer unit, CC: corner cube, PP: plane-parallel plate.