D0_A 5e-11[m^2/s] Diffusivity of A D0_Sa 2e-9[m^2/s] Diffusivity of Sa D0_Aa 1e-11[m^2/s] Diffusivity of Aa D0_S 1e-8[m^2/s] Diffusivity of S D0_B 7e-11[m^2/s] Diffusivity of B D0_Ba 1.4e-11[m^2/s] Diffusivity of Ba