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Fig. 2. Comparison of log-transformed air permeability, log(k_a), and gas diffusivity, log(D_p/D₀), as a function of log-transformed air-filled porosity, log ( ${varepsilon}$ ), for differently textured soils. The tortuosity–connectivity parameter ( ${eta}$ ) values for air permeability and gas diffusivity are given; b = Campbell (1974) pore-size distribution parameter.