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. 2020 Nov 24;510:110539. doi: 10.1016/j.jtbi.2020.110539

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Fig. 4 — Plots of $R_{0}$ , derivative ${dR}_{0} / {dh}_{2}$ , and differential sensitivity $\frac{d \log R_{0}}{d \log h_{2}} = \frac{{dR}_{0}}{{dh}_{2}} \cdot \frac{h_{2}}{R_{0}}$ , all as functions of $h_{2}$ at $R^{*} = 0$ . Different ranges picked for clarity. ${dR}_{0} / {dh}_{2}$ and differential sensitivity converge to zero.