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Fig. A.1

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Test of the iterative numerical method to solve the diffusion equation without chemical sources and sinks. We consider a δ-peak for the initial concentration xmol = ni,k/nk at the start of the iterations in a Gaussian density structure (see text). The upper figure shows the concentrations as a function of the number of iterations carried out. The lower figure shows the relative deviations between iterations (see Eqs. (28) and (29)).

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