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Acknowledgements

Dr. Torleif Dahlin of Lund University in Sweden kindly provided the Lernacken data set. The Rathcroghan data set was kindly provided by Dr. Kevin Barton and Dr. Colin Brown from data collected by the Applied Geophysics Unit of University College Galway, Ireland. The Redas river survey data set was kindly provided by Jef Bucknix of Sage Engineering, Belgium.