Fig. 6

Higher drug doses promote a selective sweep towards more resistant phenotypic variants. Profile of the equilibrium population density \(\overline {n}_{c}(x)\) for different values of the drug dose, i.e., c(·)=0 (black line), c(·)=C≡ LC₃₀ (red line), c(·)=C≡ LC₆₀ (orange line), and c(·)=C≡ LC₉₀ (yellow line). The values of the model parameters are as in Table 1