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. 2020 May 16;9(5):100. doi: 10.3390/biology9050100

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© 2020 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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Left panel: values of $R_{c}$ in the plane $(α, β)$ . Right panel: values of $R_{c}$ in the plane $(γ_{I}, β)$ . The other parameters are those estimated on March 24. The red line corresponds to $R_{c} = 1$ (dashed lines showing confidence intervals).