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. 2020 Aug 25;414:132701. doi: 10.1016/j.physd.2020.132701

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Fig. 10 — Fraction of susceptible population with $β (t) = β_{n} = 0.1962$ , $β (t) = β_{l} = 0.1279$ , and $β (t) = β_{n} - β_{d} H (t - 55) + β_{d} H (t - 550)$ . The parameters used for the generating the results are $γ = 0.08$ , $p = 0.2$ , and $τ = 10$ . Here $β_{d} = β_{n} - β_{l}$ .