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. 2021 Sep 28;514(2):125677. doi: 10.1016/j.jmaa.2021.125677

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Fig. 1 — (a) Estimated coefficient surface $\hat{γ} (s, t)$ in the RDED model (5), where t corresponds to number of days since April 5, 2020 and s takes values from 0 to τ₀. (b) t-sliced cross sections for t = 1,26,51,76,101,126 of $\hat{γ} (s, t)$ as functions of s.