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. 1997 Mar-Apr;102(2):213–228. doi: 10.6028/jres.102.017

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 8 — A detail of the log frequency vs 1/T for polyvinyl acetate in the frequency-temperature region where the α and β processes meet. Above the merging point, the process, an intramolecular cooperative relaxation process, takes over.