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FIG. 2. (a) Background moisture content profiles estimated using cross-borehole ground penetrating radar (GPR) and electrical resistivity tomography (ERT); (b) sediment samples from a nearby well (d10, d50 and d90 are the 10th, 50th and 90th percentiles of the grain size distribution; data provided by Copenhagen Energy), and (c) the five-layered model used in the hydrologic forward simulation. The boundaries of the different materials were deduced from (a) and (b).