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. 2021 Apr 30;147:110952. doi: 10.1016/j.chaos.2021.110952

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Fig. 4 — Numerical solutions of fractional order SARS-CoV-2 model with the drug therapy. Comparison of the efficacy in different time intervals for $ϵ_{1} = ϵ_{2} = 0.02$ (small) for $t \leq 10$ days and $ϵ_{1} = ϵ_{2} = 0.9$ (high) for $t > 10$ days when $R_{0} > 1$ keeping $α = 1$ and $T = 20$ days.