Fig. 5

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Comparison of the simulated tracer, ester and alcohol concentration profiles using first- and second-order schemes when gradually refining the gridblock size to , with n = 1, 2, 4, 8, 16 and Δr
0 = 0.56 m the coarsest gridblock size (see the text). Symbols denote the maximum concentration profiles peak amplitudes. Normalized profiles are reported in Figures 6– 8.