1. GFZ German Research Centre for Geosciences, Telegrafenberg, D-14473 Potsdam, Germany
2. Department of Earth Sciences, Freie Universität, Malteserstr. 74–100, D-12249 Berlin, Germany
3. Wintershall Dea GmbH, Friedrich-Ebert-Str. 160, D-34119 Kassel, Germany