Fig. 6.

Graphs of R (left), RL (middle) and R _tot (right) versus time for L ₀ = 30, 100, 300, 900 mg/L and parameters given in Table 3, whilst R(0) = R ₀ and RL(0) = 0. The dashed line indicates the target baseline level R ₀ and the dotted line the level R _*