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. 2019 Apr 28;21(5):442. doi: 10.3390/e21050442

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© 2019 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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Figure A2 — $Q (x) = {(1 + x_{1}^{2})}^{- 1} {(1 + x_{2}^{2})}^{- 1} = α$ with $0 < α < 1$ .