Fig. 5. Non-steady-state diffusive flux estimator goodness-of-fit (²) to simulated headspace concentrations (closed symbols) and flux (f₀) estimation accuracy (open symbols) as a function of chamber wall insertion depth. Data are for a fixed effective chamber height h = 20 cm and 30-min deployment periods on soil with air-filled porosity = 0.3 or 0.5. Lines are not fits, but connect the data points to aid the eye.