1. Seminar for Statistics, Department of Mathematics, ETH Zurich, Rämistrasse 101, 8092 Zurich, Switzerland
2. Department of Physics and Department of Geosciences, Tübingen University, Schnarrenbergstr. 94-96, 72076 Tübingen, Germany
3. Institute of Applied Mathematics and Interdisciplinary Center for Scientific Computing (IWR), Heidelberg University, Im Neuenheimer Feld 205, 69120 Heidelberg, Germany