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. 2022 Mar 16;231(18-20):3461–3470. doi: 10.1140/epjs/s11734-022-00537-2

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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2022

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 3 — A The 3D figure shows $R_{0}$ as a function of $α$ and $β$ , B The contour plots of the values of $R_{0}$ with respect to $α$ and $β$