Figure $6\mathrm{.}20.$ Simple twocompartmental model for an incompletely mixed "chemostat."

$\backslash$table$[[,$Substrate balance,Biomass balance$],[$Region $1,x_1=Y(S_0-S_1),x_2+D^{\text{'}}{}_m\frac{S_1}{K_s+S_1}{x}_1=(1+D{D}^{\text{'}})x_1$