Text this: Spatio-temporal evolution of <i>C</i><sub>2</sub>/<i>C</i><sub>1</sub> ratios that account for internalization and externalization rates—<i>E</i> = 70<i>kV</i>/<i>m</i>, <i>λ</i><sub><i>inl</i></sub> = 0.01<i>m</i>/<i>s</i> and <i>MPK</i>.