Fig. 6. Distributions of exponential decay terms produced by CONTIN analysis of the peak amplitude of successive echoes from a long train of pulses applied to a loamy sand in the variable matric potential holder. Three distributions produced by successively draining the soil to 20 hPa (=20 cm), 40, and 60 hPa are shown. Fits were made to 54 logarithmically spaced decay terms.