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Fig. 2. Goodness-of-fit ( ${chi}$ ²) of selected trace gas flux estimation models to simulated chamber headspace concentrations as a function of the experimental time constant ${tau}$ . Data points represent observations for effective chamber heights h = 5, 10, 20, 50, and 100 cm on soil with air-filled porosity ${theta}$ = 0.3 and 30-min deployment periods. The solid lines are not fits, but connect the data points to aid the eye.