1. EDDy lab, Geology Department, University of Liège, Allée du Six-Août, B18, Sart Tilman, B-4000 Liège, Belgium;
2. Department of Computer Science, Algoma University, 1520 Queen Street East, Sault Ste Marie, ON, P6A2G4, Canada;
3. Géosceinces Environnement Toulouse, Université de Toulouse, CNRS, IRD, 14 Avenue Édouard Belin, F-31400 Toulouse, France