Figure 7.

Drug release curves $M^d\left(\theta \right)/M_{\infty }^d$ for $De={10}^{-2}$, $\alpha =D_d/D=0.01$, ${\gamma }_d={\gamma }_r/2$ and ${\gamma }_r=0,log10,log100$. The arrow indicates increasing values of ${\gamma }_r$. The dot-dashed black line represents the limiting case $De\to 0$.