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. 2017 Aug 25;17(9):1958. doi: 10.3390/s17091958

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© 2017 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Spectral coherence between R $_{1344}$ and H $_{1344}$ at $12 k m / h$ (Top) and between R $_{400}$ and H $_{400}$ at $18 k m / h$ (Bottom).